October weather forecast
Key West, FL

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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 brings a refreshing change to the monotonous hot and humid regimen in Key West. This month is a transition period from the scorching summer to cooler autumn temperatures. Albeit marginally, the arrival of October sees a drop in both temperatures and rainfall. Known as the beginning of the "dry season", the fresher cleaner air provides a breath of freshness to the city. The month marks a notable escalation in wind speed, reaching a high of 13.7mph (22km/h), providing a noticeable contrast to the prior calm conditions.

Temperature

October's onset in Key West records an average high-temperature of a still warm 82°F (27.8°C), a near match to September's 84.4°F (29.1°C). During October, Key West's nighttime temperatures demonstrate a subtle cooling from daytime highs, stabilizing at a still moderately hot 79.7°F (26.5°C).

Heat index

October's average heat index is appraised at a tropical 87.8°F (31°C). With sustained exposure and activity, exhaustion becomes probable, resulting in heat cramps.
When assessing, remember that heat index measurements are for light winds and shaded spots. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a metric representing the sensation of warmth when air temperature and moisture come together. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.

Humidity

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

Rainfall

In Key West, Florida, in October, during 20.1 rainfall days, 4.21" (107mm) of precipitation is typically accumulated. Throughout the year, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Ocean temperature

In Key West, in October, the average water temperature is 82.9°F (28.3°C).
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.

Daylight

In October, the average length of the day in Key West, Florida, is 11h and 34min.
On the first day of October, sunrise is at 7:19 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 6:47 pm EDT.

Sunshine

In October, the average sunshine is 7.4h.

UV index

The months with the highest UV index are April through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In October, the maximum UV index of 7 suggests this advice:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in October in Key West?

In October, in Key West, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 79.7°F (26.5°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in October is appraised at 87.8°F (31°C).

What is the average humidity in October in Key West?

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

How many days does it rain in October in Key West?

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

What is the ocean temperature in October in Key West?

In Key West, Florida, the average seawater temperature in October is 82.9°F (28.3°C). 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.

How many hours of daylight does Key West have in October?

In Key West, Florida, the average day length in October is 11h and 34min.

When is the sunrise / sunset in October in Key West?

On the first day of October in Key West, sunrise is at 7:19 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 6:47 pm EDT.

How many hours of sunshine does Key West have in October?

The average sunshine duration in October is 7.4h.

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

April through October, with an average maximum UV index of 7, are months with the highest UV index in Key West, Florida.

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

The average daily maximum UV index in October in Key West is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

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).

Average pressure in October
Key West, FL

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

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

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).

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%).
The months with the lowest relative humidity are July, August and September (74%).

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").

Average rainfall days in October
Key West, FL

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

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).

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).

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: 11h and 4min

The month with the longest days is June (Average daylight: 13h and 36min).
The month with the shortest days is December (Average daylight: 10h and 36min).

  • Average sunshine in October: 7h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).

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).

Average UV index in October
Key West, FL

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

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).

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).

Average visibility in October
Key West, FL

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

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).

Key West, Florida, USA

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