How warm is it in Key West in December?

Daytime highs averaged 24.5 °C, night-time lows 23.1 °C. The highest value of the past 10 years was 27.1 °C (3 Dec 2023), the lowest 16.3 °C (26 Dec 2020).

How often does it rain in Key West in December?

On average there were 6.3 rain days (at least 1 mm) with 60.0 mm of precipitation in total.

How warm is the sea in Key West in December?

The sea temperature averaged 24.3 °C (open-sea point approx. 3 km from the town).

Holiday Weather Rewind

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Key West weather in December: temperature & rain

Photo: Juliancolton · Public domain

🇺🇸 Weather in Key West in December

This is what the weather in Key West (Florida, USA) was like in December over the years 2016–2025.

Key facts at a glance

Prevailing weather: Sunny

Avg. daytime high

24.5 °C

23.6 °C – 25.4 °C

Avg. night-time low

23.1 °C

21.7 °C – 24.3 °C

Avg. rain days in period

6.3

20 % of days · ≥ 1.0 mm

Avg. precipitation in period

60.0 mm

2.0 mm – 261 mm

Avg. cloud cover

47 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

24.3 °C

Sea measuring point approx. 3 km from the location

Extremes: Highest temperature 27.1 °C (3 Dec 2023) · Lowest temperature 16.3 °C (26 Dec 2020) · Avg. daily peak wind 26 km/h

Weather mix of all days

106Sunny
104Partly cloudy
37Cloudy
35Light rain
28Rain

Summary

On average 24.5 °C during the day and 23.1 °C at night.
On average 6.3 rain days (Rain day = at least 1.0 mm of precipitation) with 60.0 mm of precipitation in total.
The sea averaged 24.3 °C.
Prevailing weather: Sunny.
Warmest year: 2016 (avg. 25.4 °C), coolest: 2024 (avg. 23.6 °C).
Wettest year: 2023 (261 mm), driest: 2017 (2.0 mm).
Extremes: 27.1 °C on 3 Dec 2023 and 16.3 °C on 26 Dec 2020.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2025
Avg. max24.9°Avg. min23.6°
Rain days
8 Rain days
Precipitation
84.1 mm
Avg. cloud cover
36 % cloudy
Sea temperature
24.6 °C
Max 26.9 °C · Min 18.1 °C
2024
Avg. max23.6°Avg. min22.1°
Rain days
5 Rain days
Precipitation
16.6 mm
Avg. cloud cover
56 % cloudy
Sea temperature
23.5 °C
Max 25.2 °C · Min 17.3 °C
2023
Avg. max24.3°Avg. min22.8°
Rain days
10 Rain days
Precipitation
261 mm
Avg. cloud cover
75 % cloudy
Sea temperature
24.0 °C
Max 27.1 °C · Min 19.5 °C
2022
Avg. max24.7°Avg. min23.3°
Rain days
11 Rain days
Precipitation
93.0 mm
Avg. cloud cover
42 % cloudy
Sea temperature
24.9 °C
Max 26.6 °C · Min 16.8 °C
2021
Avg. max25.3°Avg. min24.2°
Rain days
6 Rain days
Precipitation
51.6 mm
Avg. cloud cover
31 % cloudy
Sea temperature
24.6 °C
Max 26.4 °C · Min 20.1 °C
2020
Avg. max23.7°Avg. min21.7°
Rain days
6 Rain days
Precipitation
38.5 mm
Avg. cloud cover
52 % cloudy
Sea temperature
23.4 °C
Max 25.5 °C · Min 16.3 °C
2019
Avg. max24.8°Avg. min23.5°
Rain days
9 Rain days
Precipitation
32.4 mm
Avg. cloud cover
52 % cloudy
Sea temperature
24.4 °C
Max 26.3 °C · Min 19.7 °C
2018
Avg. max24.5°Avg. min22.9°
Rain days
2 Rain days
Precipitation
9.9 mm
Avg. cloud cover
57 % cloudy
Sea temperature
23.8 °C
Max 26.8 °C · Min 18.6 °C
2017
Avg. max24.2°Avg. min22.8°
Rain days
1 Rain days
Precipitation
2.0 mm
Avg. cloud cover
29 % cloudy
Sea temperature
24.1 °C
Max 26.6 °C · Min 17.7 °C
2016
Avg. max25.4°Avg. min24.3°
Rain days
5 Rain days
Precipitation
10.4 mm
Avg. cloud cover
37 % cloudy
Sea temperature
25.2 °C
Max 26.5 °C · Min 19.9 °C

Frequently asked questions

How warm is it in Key West in December?: Daytime highs averaged 24.5 °C, night-time lows 23.1 °C. The highest value of the past 10 years was 27.1 °C (3 Dec 2023), the lowest 16.3 °C (26 Dec 2020).
How often does it rain in Key West in December?: On average there were 6.3 rain days (at least 1 mm) with 60.0 mm of precipitation in total.
How warm is the sea in Key West in December?: The sea temperature averaged 24.3 °C (open-sea point approx. 3 km from the town).

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis); Sea measuring point approx. 3 km from the location (24.590, -81.780)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)