October 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 October

October, like September, in Key West, Florida, is another warm autumn month, with temperature in the range of an average low of 79.7°F (26.5°C) and an average high of 82°F (27.8°C).

Temperature

In October, the average high-temperature is relatively the same as in September - a still warm 82°F (27.8°C). In Key West, the average low-temperature is 79.7°F (26.5°C).

Heat index

The average heat index in October is computed to be a hot 87.6°F (30.9°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, clothing, metabolic differences), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In October, the average relative humidity in Key West is 75%.

Rainfall

In Key West, Florida, during October, the rain falls for 20.1 days and regularly aggregates up to 4.21" (107mm) of precipitation. Throughout the year, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Ocean temperature

In October, the average ocean temperature is 82.9°F (28.3°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Key West, the average length of the day in October is 11.6h.

Sunshine

The average sunshine in October is 7.4h.

UV index

Months with the highest UV index in Key West are April through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: In October, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 temperature in October in Key West?

In Key West, in October, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 79.7°F (26.5°C). In October, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, is computed to be 87.6°F (30.9°C).

What is the average humidity in October in Key West?

The average relative humidity in October in Key West, Florida, is 75%.

How much does it rain in Key West in October?

In Key West, in October, it is raining for 20.1 days, with typically 4.21" (107mm) of accumulated precipitation.

What is the water temperature in October in Key West?

In Key West, Florida, the average seawater temperature in October is 82.9°F (28.3°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

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

In Key West, Florida, the average length of the day in October is 11.6h.

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

In October, the average sunshine is 7.4h.

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.

What is the UV index intensity in October in Key West?

The average daily maximum UV index in October in Key West, Florida, is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in October
Key West, FL

Average temperature in October - Key West, FL
  • Average high temperature in October: 82°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 October: 79.7°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 in October
Key West, FL

Average pressure in October - Key West, FL
  • Average pressure in October: 29.93"

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 October
Key West, FL

Average wind speed in October - Key West, FL
  • Average wind speed in October: 13.7mph

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 October
Key West, FL

Average humidity in October - Key West, FL
  • Average humidity in October: 75%

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 October
Key West, FL

Average rainfall in October - Key West, FL
  • Average rainfall in October: 4.21"

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 October
Key West, FL

Average rainfall days in October - Key West, FL
  • Average rainfall days in October: 20.1 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 October
Key West, FL

Average sea temperature in October - Key West, FL
  • Average sea temperature in October: 82.9°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 October /
Average sunshine in October
Key West, FL

Average daylight in October / Average sunshine in October - Key West, FL
  • Average daylight in October: 11.6h

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 October: 7.4h

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 October
Key West, FL

Average sunshine days in October - Key West, FL
  • Average sunshine days in October: 7.2 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 October
Key West, FL

Average UV index in October - Key West, FL
  • Average UV index in October: 7

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 October
Key West, FL

Average cloud cover in October - Key West, FL
  • Average cloud cover in October: 33

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 October
Key West, FL

Average visibility in October - Key West, FL
  • Average visibility in October: 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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