Monthly weather forecast and climate
Key West, FL

A beach pier in Key West, Florida, with palm trees in the background
A beach pier in Key West, Florida, with palm trees in the background
January, the same as December, in Key West, Florida, is another pleasant winter month, with average temperature ranging between min 68.5°F (20.3°C) and max 72.7°F (22.6°C). The coldest month is January, with an average high-temperature of 72.7°F (22.6°C) and an average low-temperature of 68.5°F (20.3°C). Weather in January »

The last month of the winter, February, is another pleasant month in Key West, Florida, with average temperature fluctuating between 69.8°F (21°C) and 73°F (22.8°C). In Key West, Florida, the average high-temperature is relatively the same as in January - a still pleasant 73°F (22.8°C). Weather in February »

The first month of the spring, March, is a warm month in Key West, Florida, with average temperature ranging between min 70.5°F (21.4°C) and max 73.9°F (23.3°C). In March, the average high-temperature is relatively the same as in February - a warm 73.9°F (23.3°C). Weather in March »

April, the same as March, is another warm spring month in Key West, Florida, with average temperature fluctuating between 77.4°F (25.2°C) and 74.8°F (23.8°C). In April, the average high-temperature is practically the same as in March - a still warm 77.4°F (25.2°C). Weather in April »

May, the last month of the spring, in Key West, is also a moderately hot month, with average temperature ranging between max 80.2°F (26.8°C) and min 77.9°F (25.5°C). In Key West, the average high-temperature in May is relatively the same as in April - a still moderately hot 80.2°F (26.8°C). Weather in May »

June, the first month of the summer, in Key West, is also a moderately hot month, with average temperature varying between 81.5°F (27.5°C) and 83.3°F (28.5°C). In Key West, the average high-temperature is relatively the same as in May - a still moderately hot 83.3°F (28.5°C). Weather in June »

July, the same as June, is a moderately hot summer month in Key West, Florida, with average temperature ranging between max 84.7°F (29.3°C) and min 82.8°F (28.2°C). In July, the average high-temperature is practically the same as in June - a still warm 84.7°F (29.3°C). Weather in July »

The last month of the summer, August, is also a moderately hot month in Key West, Florida, with temperature in the range of an average high of 85.3°F (29.6°C) and an average low of 82.9°F (28.3°C). The warmest month is August, with an average high-temperature of 85.3°F (29.6°C) and an average low-temperature of 82.9°F (28.3°C). The average heat index is evaluated at a hot 95°F (35°C). Weather in August »

The first month of the autumn, September, is also a moderately hot month in Key West, Florida, with average temperature fluctuating between 82.2°F (27.9°C) and 84.4°F (29.1°C). In September, the average high-temperature is relatively the same as in August - a still moderately hot 84.4°F (29.1°C). Weather in September »

October, like September, in Key West, Florida, is another warm autumn month, with average temperature varying between 82°F (27.8°C) and 79.7°F (26.5°C). In Key West, the average high-temperature in October is relatively the same as in September - a still moderately hot 82°F (27.8°C). Weather in October »

November, the last month of the autumn, in Key West, is also a moderately hot month, with average temperature fluctuating between 77.9°F (25.5°C) and 74.8°F (23.8°C). In November, the average high-temperature is relatively the same as in October - a still warm 77.9°F (25.5°C). Weather in November »

The first month of the winter, December, is also a moderately hot month in Key West, Florida, with average temperature varying between 75.2°F (24°C) and 72.5°F (22.5°C). In December, the average high-temperature is essentially the same as in November - a still warm 75.2°F (24°C). Weather in December »

What is the coldest month in Key West?

January is the coldest month, with an average high-temperature of 72.7°F (22.6°C) and an average low-temperature of 68.5°F (20.3°C).

How much does it rain in Key West?

Throughout the year, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

What are the months with the coldest ocean in Key West?

January and February, with an average ocean temperature of 71.2°F (21.8°C), are months with the coldest seawater.

What is the month with the lowest UV index in Key West?

January is the month with the lowest UV index in Key West, Florida, with an average maximum UV index of 5.

What is the most humid month in Key West?

The most humid month in Key West is February, with an average relative humidity of 78%.

What is the driest month in Key West?

March is the month with the least rainfall in Key West, Florida. Rain falls for 11.7 days and accumulates 0.67" (17mm) of precipitation.

What are the months with the highest UV index in Key West?

Months with the highest UV index are April through October, with an average maximum UV index of 7.

When are the longest days in Key West?

June has the longest days of the year in Key West, with an average of 13.6h of daylight.

What are the least humid months in Key West?

July through September, with an average relative humidity of 74%, are the least humid months in Key West.

What month has the most sunshine in Key West?

The month with the most sunshine in Key West, Florida, is July, with an average of 11h of sunshine.

What is the warmest month in Key West?

August is the warmest month, with an average high-temperature of 85.3°F (29.6°C) and an average low-temperature of 82.9°F (28.3°C).

When is the ocean warmest in Key West?

With an average ocean temperature of 86.9°F (30.5°C), August is the month with the warmest seawater in Key West.

What is the rainiest month in Key West?

The month with the most rainfall in Key West is September when the rain falls for 23.1 days and typically aggregates up to 5.12" (130mm) of precipitation.

What is the month with the shortest days in Key West?

December has the shortest days of the year, with an average of 10.6h of daylight.

What is the month with the least sunshine in Key West?

December has the least sunshine of the year, with an average of 6.3h of sunshine.
Average temperature - Key West, FL
Average pressure - Key West, FL

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are September and October (29.93").

Average wind speed - Key West, FL

The windiest months (with the highest average wind speed) are January and November (14.4mph).
The calmest month (with the lowest average wind speed) is July (9.5mph).

Average humidity - Key West, FL
Average rainfall - Key West, FL

The wettest month (with the highest rainfall) is September (5.12").
The driest month (with the least rainfall) is March (0.67").

Average rainfall days - Key West, FL

Months with the highest number of rainy days are August and September (23.1 days).
The month with the least rainy days is February (11 days).

Average sea temperature - Key West, FL

The best month for swimming (with the highest average sea temperature) is August (86.9°F).
The coldest months (with the lowest average sea temperature) are January and February (71.2°F).

Average daylight / Average sunshine - Key West, FL

The month with the longest days is June (Average daylight: 13.6h).
The month with the shortest days is December (Average daylight: 10.6h).

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 6.3h).

Average sunshine days - Key West, FL
Average UV index - Key West, FL
Average visibility - Key West, FL

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).