January 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 low of 68.5°F (20.3°C) and an average high of 72.7°F (22.6°C).

Temperature

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.

Humidity

In January, the average relative humidity in Key West is 76%.

Rainfall

In Key West, it is raining for 12.3 days, with typically 1.34" (34mm) of accumulated precipitation. Throughout the year, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Ocean temperature

Months with the coldest seawater in Key West, Florida, are January and February, with an average ocean temperature of 71.2°F (21.8°C).
Note: Swimming in 71.2°F (21.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day in January is 10.8h.

Sunshine

In January, the average sunshine in Key West, Florida, is 7.2h.

UV index

With an average maximum UV index of 5, January is the month with the lowest UV index in Key West, Florida. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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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).

What is the average humidity in January in Key West?

In January, the average relative humidity is 76%.

How much does it rain in Key West in January?

In Key West, during January, the rain falls for 12.3 days and regularly aggregates up to 1.34" (34mm) of precipitation.

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

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

What is the ocean temperature in January in Key West?

In Key West, in January, the average water temperature is 71.2°F (21.8°C). For most, swimming in 71.2°F (21.8°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in January in Key West?

In January, the average length of the day is 10.8h.

How long on average sun shines in January in Key West?

In January, the average sunshine in Key West, Florida, is 7.2h.

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 UV index intensity in January in Key West?

The average daily maximum UV index in January is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in January
Key West, FL

Average temperature in January - Key West, FL
  • Average high temperature in January: 72.7°F

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).

  • Average low temperature in January: 68.5°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 in January
Key West, FL

Average pressure in January - Key West, FL
  • Average pressure in January: 30.09"

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

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Average wind speed in January
Key West, FL

Average wind speed in January - Key West, FL
  • Average wind speed in January: 14.4mph

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 in January
Key West, FL

Average humidity in January - Key West, FL
  • Average humidity in January: 76%

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 in January
Key West, FL

Average rainfall in January - Key West, FL
  • Average rainfall in January: 1.34"

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 in January
Key West, FL

Average rainfall days in January - Key West, FL
  • Average rainfall days in January: 12.3 days

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 in January
Key West, FL

Average sea temperature in January - Key West, FL
  • Average sea temperature in January: 71.2°F

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 in January /
Average sunshine in January
Key West, FL

Average daylight in January / Average sunshine in January - Key West, FL
  • Average daylight in January: 10.8h

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

  • Average sunshine in January: 7.2h

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 in January
Key West, FL

Average sunshine days in January - Key West, FL
  • Average sunshine days in January: 14 days

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 in January
Key West, FL

Average UV index in January - Key West, FL
  • Average UV index in January: 5

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 cloud cover in January
Key West, FL

Average cloud cover in January - Key West, FL
  • Average cloud cover in January: 34

The month with the most cloud cover is January (Cloud cover 34).
The month with the least cloud cover is April (Cloud cover 23).

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Average visibility in January
Key West, FL

Average visibility in January - Key West, FL
  • Average visibility in January: 6mi

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).

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