Average Temps In Key West, FL: Monthly Climate And Weather Insights [Updated On: October 2025]

Key West has a temperature range of 65°F to 89°F year-round. The average high temperature in July reaches 85°F, while the average low in January is 69°F. Key West sees about 2.04 inches of precipitation in January. The area experiences high humidity and many sunshine hours throughout the year.

In August, humidity peaks, and temperatures often feel hotter than the actual number. As fall approaches, temperatures gradually decline, with October averages around 80°F (27°C). December brings cooler evenings, averaging 66°F (19°C) but remains pleasant compared to many regions.

Key West’s average temperatures reflect a consistent warmth ideal for year-round visitors. Each season offers unique charm, making it a favored spot for tourists.

Next, we will explore the impact of these average temperatures on the outdoor activities available in Key West. Understanding how weather influences local events can enhance your travel experience. From water sports in the summer to cultural festivals in the cooler months, knowing the climate helps plan your activities effectively.

Table of Contents

What Are The Average Temperatures in Key West, FL Across the Year?

The average temperatures in Key West, FL vary throughout the year, ranging from mild winters to warm summers.

Winter (December to February): Average temperatures range from 65°F to 75°F.
Spring (March to May): Average temperatures increase to between 70°F and 80°F.
Summer (June to August): Average temperatures peak at 80°F to 90°F.
Fall (September to November): Average temperatures decrease, fluctuating between 75°F and 85°F.

These temperature variations highlight the tropical climate of Key West. However, climate change and shifting weather patterns can also influence temperature records.

Winter (December to February):
Winter temperatures in Key West remain mild. The average daily temperature ranges from 65°F to 75°F. According to the National Weather Service, this season often features comfortable days and cool evenings. The mild climate is a significant draw for tourists.
Spring (March to May):
Spring sees a gradual increase in temperatures. The average range is between 70°F and 80°F. This season typically brings sunny days with lower humidity. In March, the average temperature can be around 72°F, making it a popular time for outdoor activities.
Summer (June to August):
Summer temperatures in Key West peak significantly. Average temperatures range from 80°F to 90°F. This period also marks the rainy season, which can increase humidity levels. The Florida Keys contribute to higher heat indices, leading to a warmer perceived temperature for residents and visitors alike.
Fall (September to November):
During fall, temperatures begin to decrease after the peak summer heat. Average temperatures fluctuate between 75°F and 85°F. The season is often associated with hurricanes, as September is usually the peak month for tropical storms in the Atlantic.

Understanding these seasonal temperature variations allows individuals to better plan vacations and outdoor activities. By considering climate trends, one can appreciate Key West’s inviting tropical environment while being aware of potential weather extremes.

How Do Monthly Temperature Averages Compare in Key West, FL?

Monthly temperature averages in Key West, FL, typically range from warm to hot throughout the year, averaging between 70°F and 90°F.

Key points about the temperature averages in Key West include:

Warm Winters: The winter months, December through February, generally have average temperatures between 65°F and 75°F. According to the National Oceanic and Atmospheric Administration (NOAA, 2020), January is the coolest month, with an average high of 75°F.
Hot Summers: Summer months, from June to August, are significantly warmer, with average highs reaching 88°F to 90°F. The average low temperatures remain around 75°F during these months. Data from the Florida Climate Center (2021) indicates that July is often the hottest month.
High Humidity Levels: Key West experiences high humidity throughout the year, often exceeding 70%. This factor can make temperatures feel warmer than they actually are. The U.S. Climate Data (2022) reports that peak humidity occurs in the summer months.
Rainy Season: The rainy season typically spans from May to October, contributing to higher temperatures and humidity. Monthly rainfall averages during this period can exceed 7 inches. The Southeast Regional Climate Center (2021) notes that August usually sees the highest rainfall.
Consistent Temperatures: Year-round, Key West has a reputation for mild, consistent temperatures because it lies in a tropical climate zone. Seasonal fluctuations are minimal compared to many other regions in the United States.

Understanding these averages and trends can help residents and visitors plan activities and dress appropriately for the warm, humid climate of Key West.

What Are the Highs and Lows for Each Month in Key West, FL?

The highs and lows for each month in Key West, FL, vary throughout the year, with warm temperatures and occasional rain. Highs typically range from the mid-70s°F in winter to the upper 90s°F in summer. Lows can drop to the low 60s°F during winter months and remain in the 70s°F during summer.

January: Highs around 75°F, lows around 63°F
February: Highs around 76°F, lows around 64°F
March: Highs around 79°F, lows around 66°F
April: Highs around 82°F, lows around 70°F
May: Highs around 86°F, lows around 73°F
June: Highs around 88°F, lows around 77°F
July: Highs around 89°F, lows around 79°F
August: Highs around 89°F, lows around 79°F
September: Highs around 88°F, lows around 78°F
October: Highs around 84°F, lows around 75°F
November: Highs around 80°F, lows around 70°F
December: Highs around 76°F, lows around 65°F

These monthly temperatures highlight the general climate trends in Key West, but individual experiences may vary based on personal preferences for weather conditions. While many may enjoy the warmth and the summer months, others may prefer the cooler temperatures of the winter season.

January
January temperatures in Key West often reach highs of 75°F and lows of 63°F. This month marks the peak of winter. Visitors enjoy mild days and cooler nights, making it a popular time for outdoor activities and festivals.
February
February generally has highs around 76°F and lows of 64°F. As the last month of winter, February sees similar weather to January. Many tourists visit to escape colder northern climates.
March
March boasts highs of about 79°F and lows around 66°F. This month transitions into early spring. Popular events like boat races occur during this period, attracting crowds to the region.
April
April temperatures can reach highs of 82°F with lows around 70°F. This month is characterized by warm and pleasant weather. It is ideal for water sports and outdoor exploration.
May
May typically ranges from highs of 86°F to lows of 73°F. It marks the beginning of the summer season. Humidity starts to increase, which may not appeal to everyone.
June
June brings warmer weather, with highs around 88°F and lows of 77°F. This month marks the onset of the summer season, increasing humidity and potential rain.
July
July features highs of about 89°F and lows around 79°F. It is often the warmest month, attracting more tourists. However, high humidity can make it feel hotter.
August
August mirrors the conditions of July, with highs at 89°F and lows around 79°F. As summer continues, expectations of rainfall may deter some visitors.
September
In September, highs remain around 88°F with lows of 78°F. This month often experiences the highest rainfall but still sees many tourists enjoying the last month of summer before the fall.
October
October features highs of around 84°F and lows of 75°F. This month signals a transition to fall, bringing slightly cooler and drier weather.
November
November offers highs near 80°F and lows around 70°F. This month is one of the best times for visitors, as rain decreases and temperatures are comfortable.
December
December sees highs of 76°F and lows around 65°F. As winter arrives, the weather remains pleasant, appealing to tourists seeking a warm getaway.

In summary, the climate in Key West, FL, varies each month. Different individuals may find different months appealing. Some may favor warmer summer months for beach activities, while others might prefer the mild winter months for outdoor exploration and festivals.

How Does Precipitation Impact Average Temperatures in Key West, FL?

Precipitation significantly impacts average temperatures in Key West, FL. Rainfall influences humidity levels in the air. Higher humidity can lead to a warmer feel, even if temperatures are lower. Conversely, during periods of precipitation, temperatures may cool down temporarily due to cloud cover and rain.

Key West experiences a tropical climate. During the wet season, from May to October, the region often sees heavy rainfall. This rainfall can lower daily high temperatures. However, the overall impact on average temperatures remains moderate. The interplay between precipitation and temperature leads to a more humid environment, which can make it feel warmer.

Additionally, the presence of water bodies around Key West moderates temperature fluctuations. This means warm days can still be accompanied by cooler nights, even with consistent rainfall. In summary, while precipitation decreases temperatures temporarily, the overall impact contributes to the warm, humid climate characteristic of Key West.

How Do Humidity Levels Affect Your Comfort in Key West, FL?

Humidity levels significantly affect comfort in Key West, FL, by influencing temperature perception, sweat evaporation, and overall well-being. High humidity can make warm temperatures feel even hotter, leading to discomfort.

Temperature perception: High humidity raises the “feels like” temperature. The National Weather Service states that humidity above 60% in Key West makes temperatures feel about 5 to 10 degrees Fahrenheit warmer than they actually are (National Weather Service, 2023).
Sweat evaporation: Humidity impairs the body’s ability to cool through sweat. When the air is saturated with moisture, sweat does not evaporate effectively. This leads to a rise in body temperature and increased discomfort. A study by E. W. O’Brien in 2020 highlighted that elevated humidity levels can hinder thermoregulation during physical activities.
Overall well-being: Continuous high humidity can lead to fatigue, irritability, and health concerns. High humidity levels can exacerbate conditions such as asthma and allergies. The Centers for Disease Control and Prevention (CDC) advises that people with respiratory issues should monitor the humidity levels (CDC, 2023).

In summary, humidity impacts comfort by affecting how hot it feels, impeding sweat evaporation, and influencing overall health and comfort levels in Key West, FL.

When Is the Best Time to Visit Key West, FL Based on Temperature?

The best time to visit Key West, FL based on temperature is from late fall to early spring, specifically between November and April. During these months, average temperatures range from 70°F to 80°F. The weather is warm and pleasant, making outdoor activities enjoyable. Summer months, from June to August, can be hot and humid, with temperatures often exceeding 90°F. Additionally, this period marks the rainy season, increasing the likelihood of thunderstorms. Therefore, traveling during late fall to early spring ensures comfortable weather and a more favorable experience in Key West.

What Are Other Weather Factors to Consider When Visiting Key West, FL?

When visiting Key West, FL, it’s essential to consider various weather factors to ensure a comfortable experience. The main weather factors to consider include:

Temperature
Humidity
Rainfall
Wind Patterns
Hurricane Season

Understanding these factors will help you prepare better for your visit to Key West.

Temperature: Temperature plays a vital role in the overall experience of a trip. Key West generally experiences warm temperatures year-round, with averages ranging from 70°F (21°C) in winter to 90°F (32°C) in summer. Knowing average temperatures helps visitors dress appropriately and plan activities, such as water sports or beach days.
Humidity: Humidity levels can significantly affect comfort. Key West has high humidity, especially during summer months. High humidity can make temperatures feel hotter than they are. Staying hydrated and taking breaks in shaded areas or air-conditioned environments helps mitigate discomfort.
Rainfall: Rainfall is another critical factor. Key West experiences a distinct wet season from June to October, with the highest rainfall in September. Visitors should plan for occasional downpours during this period. Having a raincoat or umbrella handy is advisable.
Wind Patterns: Wind patterns influence the climate and weather conditions. Key West often experiences sea breezes that provide cooling effects, particularly in the summer months. Understanding wind patterns can help in activities like sailing or fishing, as water activities can be impacted by strong winds.
Hurricane Season: Hurricane season occurs from June to November. This period poses risks for extreme weather events. Travelers should stay informed about weather forecasts and emergency procedures in case of storms. Planning trips outside this season or being prepared for sudden changes is essential for safety.

By considering these factors, visitors can ensure a more enjoyable and safe trip to Key West, FL.

How Significant Is the Wind in Key West, FL?

The significance of wind in Key West, FL, is considerable. Wind influences the climate and recreational activities in the area. The region experiences a tropical climate with moderate to strong winds year-round. These winds help balance the heat and humidity. Generally, the trade winds come from the east-southeast. This consistent airflow provides a cooling effect, making outdoor activities enjoyable. The winds also impact sailing and fishing conditions, vital to the local economy. In summary, the wind contributes significantly to the overall climate and lifestyle in Key West.

How Do Sunrise and Sunset Times Vary Throughout the Year in Key West, FL?

Sunrise and sunset times vary throughout the year in Key West, FL, primarily due to its geographical location and the tilt of the Earth’s axis. As a result, these times change gradually, reflecting seasonal shifts.

Key points explaining this variation include:

Geographical Location: Key West is located at a latitude of about 24.5 degrees North. This position affects the length of daylight throughout the year.
Tilt of the Earth’s Axis: The Earth’s axial tilt of approximately 23.5 degrees causes seasonal changes in sunrise and sunset times. During summer, days are longer, while autumn and winter result in shorter days.
Seasonal Variations: In Key West, sunrise and sunset times can shift dramatically:
– Winter Months (December to February): Sunrise occurs around 7:00 AM and sunset around 5:45 PM. These times indicate the shortest daylight duration.
– Spring Months (March to May): Sunrise gradually shifts to about 6:30 AM, while sunset extends to approximately 7:50 PM by late May.
– Summer Months (June to August): The longest days occur, with sunrise around 6:15 AM and sunset at 8:10 PM.
– Autumn Months (September to November): Sunrise moves back to about 6:45 AM, and sunset adjusts to around 6:00 PM by November.
Daylight Saving Time: Key West observes Daylight Saving Time from the second Sunday in March to the first Sunday in November, further impacting sunset times. During this period, clocks are set forward by one hour.
Sunrise and Sunset Calculation: Sunrise and sunset times can be calculated using mathematical formulas based on astronomical data. Various websites and applications provide precise sunrise and sunset times for any specific day.

This variation influences daily activities and local culture, reflecting the dynamic nature of time and light throughout the seasons in Key West, Florida.

How Do Key West’s Average Temperatures Compare to Other Popular Destinations?

Key West’s average temperatures are typically warmer and more stable compared to many popular travel destinations, making it an appealing year-round getaway. Key West experiences a tropical climate characterized by relatively high temperatures, reflecting its position in the Florida Keys.

Average Temperatures: Key West averages around 77°F (25°C) annually. This is significantly higher than northern destinations like New York City, with an annual average of about 55°F (13°C), and London, averaging approximately 50°F (10°C).
Monthly Variations:
– Winter Months: From December to February, Key West experiences mild temperatures ranging from 65°F (18°C) to 75°F (24°C). In contrast, cities like Chicago can experience winter averages as low as 30°F (-1°C).
– Summer Months: Key West sees summer temperatures from June to August ranging from 80°F (27°C) to 90°F (32°C). Popular destinations such as Paris have average highs of about 75°F (24°C) during those months.
Humidity and Rainfall: Key West maintains high humidity levels year-round. The average humidity is around 74%, leading to a “feels-like” temperature that can be warmer than the actual air temperature. In comparison, places like Los Angeles have an average humidity around 62%, making the heat feel more bearable.
Seasonal Weather Patterns: Key West experiences a wet season from May to October. During this time, rainfall can reach about 7-8 inches per month. In contrast, destinations such as Miami share similar wet seasons but may receive sporadic heavy downpours that are less predictable.
Comfort Index: The Comfort Index, which accounts for temperature and humidity, suggests that Key West remains one of the most favorable climates for outdoor activities. For example, during peak summer, Key West’s Comfort Index remains around 6 to 7, meanwhile cities like New Orleans can peak at 8 due to higher humidity, making those temperatures feel more oppressive.

Overall, Key West provides a warm climate that is generally more favorable when compared to many other popular destinations, particularly during colder months. This consistency attracts tourists looking for warm weather throughout the year.

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