Climate and monthly weather forecast
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, the same as December, in Key West, Florida, is another pleasant winter month, with an average temperature ranging between max 72.7°F (22.6°C) and min 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 another pleasant month in Key West, Florida, with an average temperature fluctuating between 73°F (22.8°C) and 69.8°F (21°C). In February, the average high-temperature is practically 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 moderately hot month in Key West, Florida, with temperature in the range of an average low of 70.5°F (21.4°C) and an average high of 73.9°F (23.3°C). In Key West, Florida, the average high-temperature in March is relatively 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 another warm spring month in Key West, Florida, with an average temperature fluctuating between 77.4°F (25.2°C) and 74.8°F (23.8°C). In Key West, the average high-temperature in April is relatively the same as in March - a still moderately hot 77.4°F (25.2°C). Weather in April »

Weather in May

The last month of the spring, May, is another warm month in Key West, Florida, with an 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 »

Weather in June

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

Weather in July

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

Weather in August

August, the last month of the summer in Key West, is another warm month, with an 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 appraised at a hot 95°F (35°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Key West, Florida, with temperature in the range of an average low of 82.2°F (27.9°C) and an average high of 84.4°F (29.1°C). In September, the average high-temperature is essentially the same as in August - a still warm 84.4°F (29.1°C). Weather in September »

Weather in October

October, like September, in Key West, Florida, is another warm autumn month, with an average temperature fluctuating between 82°F (27.8°C) and 79.7°F (26.5°C). In Key West, the average high-temperature in October is almost the same as in September - a still warm 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 an average temperature fluctuating between 77.9°F (25.5°C) and 74.8°F (23.8°C). In November, the average high-temperature is practically the same as in October - a still warm 77.9°F (25.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a moderately hot month in Key West, Florida, with an average temperature varying between 72.5°F (22.5°C) and 75.2°F (24°C). In Key West, the average high-temperature in December is almost 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 in Key West, Florida, 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 many days 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.

When is the lowest UV index in Key West?

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

What is the most humid month in Key West?

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

What is the driest month in Key West?

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

When is Daylight Saving Time (DST) in Key West?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Key West, Florida, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

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

The 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?

The month with the longest days in Key West, Florida, is June, with an average of 13h and 38min of daylight.

What is the least humid month in Key West?

The months with the lowest humidity 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 in Key West, Florida, is July, with an average of 11h of sunshine.

What is the warmest month in Key West?

The warmest month in Key West, Florida, 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).

What is the month with the warmest ocean in Key West?

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

What is the wettest month in Key West?

The month with the most rainfall 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?

With an average of 10h and 39min of daylight, December has the shortest days of the year in Key West, Florida.

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

December has the least sunshine of the year in Key West, 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 (85.3°F).
The month with the lowest average high temperature is January (72.7°F).

The month with the highest average low temperature is August (82.9°F).
The coldest month (with the lowest average low temperature) is January (68.5°F).

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Average pressure
Key West, FL

Average pressure - Key West, FL

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

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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 (14.4mph).
The calmest month (with the lowest average wind speed) is July (9.5mph).

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Average humidity
Key West, FL

Average humidity - Key West, FL

The month with the highest relative humidity is February (78%).
The 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 (5.12").
The driest month (with the least rainfall) is March (0.67").

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Average rainfall days
Key West, FL

Average rainfall days - Key West, FL

The 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 (86.9°F).
The coldest months (with the lowest average sea temperature) are January and February (71.2°F).

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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: 13h and 38min).
The month with the shortest days is December (Average daylight: 10h and 39min).

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

The 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

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

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