How warm is it in Key West in January?

Daytime highs averaged 23.1 °C, night-time lows 21.2 °C. The highest value of the past 10 years was 26.0 °C (2 Jan 2022), the lowest 14.0 °C (18 Jan 2018).

How often does it rain in Key West in January?

On average there were 6.1 rain days (at least 1 mm) with 29.0 mm of precipitation in total.

How warm is the sea in Key West in January?

The sea temperature averaged 22.8 °C (open-sea point approx. 3 km from the town).

Holiday Weather Rewind

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Key West weather in January: temperature & rain

Photo: Juliancolton · Public domain

🇺🇸 Weather in Key West in January

This is what the weather in Key West (Florida, USA) was like in January over the years 2017–2026.

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

23.1 °C

21.7 °C – 24.1 °C

Avg. night-time low

21.2 °C

19.7 °C – 22.3 °C

Avg. rain days in period

6.1

20 % of days · ≥ 1.0 mm

Avg. precipitation in period

29.0 mm

5.2 mm – 85.3 mm

Avg. cloud cover

55 %

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

Avg. sea temperature

22.8 °C

Sea temperature available for 1 of 10 years.

Extremes: Highest temperature 26.0 °C (2 Jan 2022) · Lowest temperature 14.0 °C (18 Jan 2018) · Avg. daily peak wind 28 km/h

Weather mix of all days

68Sunny
118Partly cloudy
63Cloudy
48Light rain
13Rain

Summary

On average 23.1 °C during the day and 21.2 °C at night.
On average 6.1 rain days (Rain day = at least 1.0 mm of precipitation) with 29.0 mm of precipitation in total.
The sea averaged 22.8 °C.
Prevailing weather: Partly cloudy.
Warmest year: 2023 (avg. 24.1 °C), coolest: 2018 (avg. 21.7 °C).
Wettest year: 2024 (85.3 mm), driest: 2017 (5.2 mm).
Extremes: 26.0 °C on 2 Jan 2022 and 14.0 °C on 18 Jan 2018.

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

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max22.7°Avg. min20.6°
Rain days
11 Rain days
Precipitation
44.1 mm
Avg. cloud cover
53 % cloudy
Sea temperature
22.8 °C
Max 25.3 °C · Min 15.0 °C
2025
Avg. max22.0°Avg. min19.8°
Rain days
6 Rain days
Precipitation
33.3 mm
Avg. cloud cover
60 % cloudy
Sea temperature
–
Max 24.2 °C · Min 15.4 °C
2024
Avg. max23.7°Avg. min21.7°
Rain days
12 Rain days
Precipitation
85.3 mm
Avg. cloud cover
69 % cloudy
Sea temperature
–
Max 25.6 °C · Min 17.8 °C
2023
Avg. max24.1°Avg. min22.3°
Rain days
2 Rain days
Precipitation
8.6 mm
Avg. cloud cover
35 % cloudy
Sea temperature
–
Max 25.8 °C · Min 16.3 °C
2022
Avg. max23.5°Avg. min21.6°
Rain days
12 Rain days
Precipitation
68.7 mm
Avg. cloud cover
56 % cloudy
Sea temperature
–
Max 26.0 °C · Min 14.4 °C
2021
Avg. max22.7°Avg. min21.0°
Rain days
6 Rain days
Precipitation
15.8 mm
Avg. cloud cover
55 % cloudy
Sea temperature
–
Max 25.0 °C · Min 16.9 °C
2020
Avg. max23.9°Avg. min22.0°
Rain days
2 Rain days
Precipitation
10.3 mm
Avg. cloud cover
48 % cloudy
Sea temperature
–
Max 25.8 °C · Min 14.0 °C
2019
Avg. max23.0°Avg. min20.8°
Rain days
4 Rain days
Precipitation
10.0 mm
Avg. cloud cover
55 % cloudy
Sea temperature
–
Max 25.5 °C · Min 15.5 °C
2018
Avg. max21.7°Avg. min19.7°
Rain days
5 Rain days
Precipitation
9.3 mm
Avg. cloud cover
77 % cloudy
Sea temperature
–
Max 23.9 °C · Min 14.0 °C
2017
Avg. max23.7°Avg. min22.1°
Rain days
1 Rain days
Precipitation
5.2 mm
Avg. cloud cover
43 % cloudy
Sea temperature
–
Max 26.0 °C · Min 14.9 °C

Frequently asked questions

How warm is it in Key West in January?: Daytime highs averaged 23.1 °C, night-time lows 21.2 °C. The highest value of the past 10 years was 26.0 °C (2 Jan 2022), the lowest 14.0 °C (18 Jan 2018).
How often does it rain in Key West in January?: On average there were 6.1 rain days (at least 1 mm) with 29.0 mm of precipitation in total.
How warm is the sea in Key West in January?: The sea temperature averaged 22.8 °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)