October weather forecast
Key Largo, FL

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A clear seascape and cloudy evening sky in Key Largo, Florida
A clear seascape and cloudy evening sky in Key Largo, Florida

Weather in October

October brings noticeable changes in Key Largo's weather, with temperatures falling compared to September. The declining heat welcomes in a period of relief after the intense summer months. The duration of sunshine hours shortens as the days grow shorter, signifying the onset of autumn. The rainfall starts to descend significantly, making way for a drier period ahead. The maximum temperature reaches 82.2°F (27.9°C) in October, with 3.19" (81mm) of rainfall recorded.

Temperature

Key Largo commences October with an average high-temperature of a still warm 82.2°F (27.9°C), maintaining a close resemblance to the previous month. Key Largo registers an average low-temperature of 78.8°F (26°C) throughout October, a modest decrease from its daytime highs.

Heat index

The heat index value for October is estimated at a tropical 87.8°F (31°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', embodies the combination of air temperature and moisture content to illustrate perceived heat. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.

Humidity

The average relative humidity in October is 75%.

Rainfall

In October, the rain falls for 18.2 days. Throughout October, 3.19" (81mm) of precipitation is accumulated. Throughout the year, in Key Largo, Florida, there are 190.1 rainfall days, and 27.05" (687mm) of precipitation is accumulated.

Ocean temperature

In Key Largo, the average seawater temperature in October is 82.9°F (28.3°C).
Note: For water activities like swimming, diving, and more, temperatures ranging between 77°F (25°C) and 84.2°F (29°C) offer superior comfort and enjoyment for lengthy durations.

Daylight

In Key Largo, the average length of the day in October is 11h and 34min.
On the first day of October, sunrise is at 7:14 am and sunset at 7:08 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 6:41 pm EDT.

Sunshine

In October, the average sunshine is 6.9h.

UV index

April through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum UV index of 7 in October translates into the following recommendations:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. 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. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Watch out! Sand and water enhance the UV exposure you receive.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Key Largo in October?

In Key Largo, 82.2°F (27.9°C) is the average high-temperature and 78.8°F (26°C) is the average low-temperature during October. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in October is estimated at 87.8°F (31°C).

What is the average humidity in October in Key Largo?

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

How much does it rain in Key Largo in October?

In Key Largo, Florida, during October, the rain falls for 18.2 days and regularly aggregates up to 3.19" (81mm) of precipitation.

What is the ocean temperature in October in Key Largo?

In October, the average ocean temperature 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 Largo have in October?

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

When are sunrise and sunset in October in Key Largo?

In October, on the first day of the month, sunrise is at 7:14 am and sunset at 7:08 pm. On the last day of the month, in Key Largo, sunrise is at 7:29 am and sunset at 6:41 pm EDT.

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

The average sunshine duration in October is 6.9h.

When is the highest UV index in Key Largo?

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

How high is the UV index in October in Key Largo?

In October, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation.

Average temperature in October
Key Largo, FL

Average temperature in October - Key Largo, FL
  • Average high temperature in October: 82.2°F

The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is January (72.7°F).

  • Average low temperature in October: 78.8°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 (66.9°F).

Average pressure in October
Key Largo, FL

Average pressure in October - Key Largo, FL
  • Average pressure in October: 29.94"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are September and October (29.94"Hg).

Average wind speed in October
Key Largo, FL

Average wind speed in October - Key Largo, FL
  • Average wind speed in October: 12.5mph

The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).

Average humidity in October
Key Largo, FL

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

The months with the highest relative humidity are February, June and December (76%).
The month with the lowest relative humidity is March (73%).

Average rainfall in October
Key Largo, FL

Average rainfall in October - Key Largo, FL
  • Average rainfall in October: 3.19"

The wettest month (with the highest rainfall) is August (4.33").
The driest month (with the least rainfall) is March (0.59").

Average rainfall days in October
Key Largo, FL

Average rainfall days in October - Key Largo, FL
  • Average rainfall days in October: 18.2 days

The month with the highest number of rainy days is September (22.9 days).
The month with the least rainy days is February (9.7 days).

Average sea temperature in October
Key Largo, FL

Average sea temperature in October - Key Largo, FL
  • Average sea temperature in October: 82.9°F

The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is February (74°F).

Average daylight in October /
Average sunshine in October
Key Largo, FL

Average daylight in October / Average sunshine in October - Key Largo, FL
  • Average daylight in October: 11h and 4min

The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).

  • Average sunshine in October: 6h and 5min

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 24min).

Average sunshine days in October
Key Largo, FL

Average sunshine days in October - Key Largo, FL
  • Average sunshine days in October: 9.1 days

The month with the most sunshine days is January (17.3 days).
The month with the least sunshine days is September (5.2 days).

Average UV index in October
Key Largo, FL

Average UV index in October - Key Largo, 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 Largo, FL

Average cloud cover in October - Key Largo, FL
  • Average cloud cover in October: 35

The month with the most cloud cover is October (Cloud cover 35).
The month with the least cloud cover is April (Cloud cover 26).

Average visibility in October
Key Largo, FL

Average visibility in October - Key Largo, 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 Largo, Florida, USA

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