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

Weather in January

January, like December, is an agreeable winter month in Key West, Florida, with temperature in the range of an average high of 72.7°F (22.6°C) and an average low of 68.5°F (20.3°C). With an average high-temperature of 72.7°F (22.6°C) and an average low-temperature of 68.5°F (20.3°C), January is the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is also an agreeable month in Key West, Florida, with average temperature ranging between max 73°F (22.8°C) and min 69.8°F (21°C). In Key West, the average high-temperature in February is essentially the same as in January - a still pleasant 73°F (22.8°C). Weather in February »

Weather in March

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 Key West, the average high-temperature is almost the same as in February - a moderately hot 73.9°F (23.3°C). Weather in March »

Weather in April

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

Weather in May

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

Weather in June

The first month of the summer, June, is still a warm month in Key West, Florida, with temperature in the range of an average low of 81.5°F (27.5°C) and an average high of 83.3°F (28.5°C). In June, the average high-temperature is essentially the same as in May - a still moderately hot 83.3°F (28.5°C). Weather in June »

Weather in July

July, like June, in Key West, Florida, is a moderately hot summer month, with temperature in the range of an average low of 82.8°F (28.2°C) and an average high of 84.7°F (29.3°C). In July, the average high-temperature is relatively the same as in June - a still moderately hot 84.7°F (29.3°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Key West, Florida, with average temperature fluctuating between 85.3°F (29.6°C) and 82.9°F (28.3°C). 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). In August, the average heat index is evaluated at a hot 95°F (35°C). Weather in August »

Weather in September

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

Weather in October

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

Weather in November

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

Weather in December

December, the first month of the winter, in Key West, is still a warm month, with average temperature ranging between min 72.5°F (22.5°C) and max 75.2°F (24°C). In Key West, the average high-temperature is practically the same as in November - a still moderately hot 75.2°F (24°C). Weather in December »
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FAQ

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 months are the ocean coldest in Key West?

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

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

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

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?

The month with the least rainfall in Key West is March when the rain falls for 11.7 days and typically collects 0.67" (17mm) of precipitation.

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

Months with the highest UV index in Key West, Florida, 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, with an average of 13.6h of daylight.

What are the least humid months in Key West?

Months with the lowest humidity in Key West are July through September, with an average relative humidity of 74%.

What month has the most sunshine in Key West?

The month with the most sunshine is July, with an average of 11h of sunshine.

What is the warmest month in Key West?

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

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, Florida.

What is the wettest month in Key West?

September is the month with the most rainfall in Key West. Rain falls for 23.1 days and accumulates 5.12" (130mm) of precipitation.

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

The month with the shortest days is December, 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 temperature - Key West, FL

The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (22.6°C).

The month with the highest average low temperature is August (28.3°C).
The coldest month (with the lowest average low temperature) is January (20.3°C).

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Average pressure
Key West, FL

Average pressure - Key West, FL

The month with the highest atmospheric pressure is January (1019.1mbar).
Months with the lowest atmospheric pressure are September and October (1013.7mbar).

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Average wind speed
Key West, FL

Average wind speed - Key West, FL

The windiest months (with the highest average wind speed) are January and November (23.1km/h).
The calmest month (with the lowest average wind speed) is July (15.3km/h).

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Average humidity
Key West, FL

Average humidity - Key West, FL

The month with the highest relative humidity is February (78%).
Months with the lowest relative humidity are July, August and September (74%).

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Average rainfall
Key West, FL

Average rainfall - Key West, FL

The wettest month (with the highest rainfall) is September (130mm).
The driest month (with the least rainfall) is March (17mm).

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Average rainfall days
Key West, FL

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).

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Average sea temperature
Key West, FL

Average sea temperature - Key West, FL

The best month for swimming (with the highest average sea temperature) is August (30.5°C).
The coldest months (with the lowest average sea temperature) are January and February (21.8°C).

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Average daylight / Average sunshine
Key West, FL

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).

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Average sunshine days
Key West, FL

Average sunshine days - Key West, FL

The month with the most sunshine days is March (17 days).
The month with the least sunshine days is September (4.5 days).

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Average UV index
Key West, FL

Average UV index - Key West, FL

Months with the highest UV index are April, May, June, July, August, September and October (UV index 7).
The month with the lowest UV index is January (UV index 5).

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Average visibility
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 (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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