How warm is it in Key West in March?

Daytime highs averaged 24.7 °C, night-time lows 23.4 °C. The highest value of the past 10 years was 26.9 °C (3 Mar 2023), the lowest 17.6 °C (16 Mar 2017).

How often does it rain in Key West in March?

On average there were 4.6 rain days (at least 1 mm) with 34.9 mm of precipitation in total. In 3 of 10 years there was no rain day at all.

Holiday Weather Rewind

Destinations Method & data

Loading weather data…

We are fetching the daily values for every year. The first time, this takes a few seconds.

Key West weather in March: temperature & rain

Photo: Juliancolton · Public domain

🇺🇸 Weather in Key West in March

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

Key facts at a glance

Prevailing weather: Sunny

Avg. daytime high

24.7 °C

23.6 °C – 25.6 °C

Avg. night-time low

23.4 °C

21.9 °C – 24.3 °C

Avg. rain days in period

4.6

15 % of days · ≥ 1.0 mm

Avg. precipitation in period

34.9 mm

1.0 mm – 98.7 mm

Avg. cloud cover

34 %

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

Avg. sea temperature

–

Sea temperature unavailable for today (daily limit).

Extremes: Highest temperature 26.9 °C (3 Mar 2023) · Lowest temperature 17.6 °C (16 Mar 2017) · Avg. daily peak wind 27 km/h

Weather mix of all days

165Sunny
77Partly cloudy
22Cloudy
29Light rain
17Rain

Summary

On average 24.7 °C during the day and 23.4 °C at night.
On average 4.6 rain days (Rain day = at least 1.0 mm of precipitation) with 34.9 mm of precipitation in total.
In 3 of 10 years there was not a single rain day.
Prevailing weather: Sunny.
Warmest year: 2023 (avg. 25.6 °C), coolest: 2018 (avg. 23.6 °C).
Wettest year: 2024 (98.7 mm), driest: 2018 (1.0 mm).
Extremes: 26.9 °C on 3 Mar 2023 and 17.6 °C on 16 Mar 2017.

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. max24.8°Avg. min23.6°
Rain days
9 Rain days
Precipitation
75.9 mm
Avg. cloud cover
31 % cloudy
Sea temperature
–
Max 26.3 °C · Min 20.2 °C
2025
Avg. max24.4°Avg. min22.7°
Rain days
5 Rain days
Precipitation
37.0 mm
Avg. cloud cover
28 % cloudy
Sea temperature
–
Max 26.3 °C · Min 19.7 °C
2024
Avg. max25.3°Avg. min24.2°
Rain days
11 Rain days
Precipitation
98.7 mm
Avg. cloud cover
52 % cloudy
Sea temperature
–
Max 26.6 °C · Min 21.9 °C
2023
Avg. max25.6°Avg. min24.3°
Rain days
7 Rain days
Precipitation
52.8 mm
Avg. cloud cover
31 % cloudy
Sea temperature
–
Max 26.9 °C · Min 20.6 °C
2022
Avg. max25.2°Avg. min24.1°
Rain days
10 Rain days
Precipitation
56.1 mm
Avg. cloud cover
32 % cloudy
Sea temperature
–
Max 26.5 °C · Min 18.3 °C
2021
Avg. max24.5°Avg. min23.4°
Rain days
0 Rain days
Precipitation
3.1 mm
Avg. cloud cover
29 % cloudy
Sea temperature
–
Max 26.8 °C · Min 20.1 °C
2020
Avg. max24.8°Avg. min23.8°
Rain days
0 Rain days
Precipitation
1.7 mm
Avg. cloud cover
30 % cloudy
Sea temperature
–
Max 26.4 °C · Min 18.9 °C
2019
Avg. max24.6°Avg. min23.4°
Rain days
2 Rain days
Precipitation
15.8 mm
Avg. cloud cover
35 % cloudy
Sea temperature
–
Max 26.0 °C · Min 19.1 °C
2018
Avg. max23.6°Avg. min21.9°
Rain days
0 Rain days
Precipitation
1.0 mm
Avg. cloud cover
37 % cloudy
Sea temperature
–
Max 25.3 °C · Min 18.1 °C
2017
Avg. max23.8°Avg. min22.6°
Rain days
2 Rain days
Precipitation
6.9 mm
Avg. cloud cover
35 % cloudy
Sea temperature
–
Max 25.9 °C · Min 17.6 °C

Frequently asked questions

How warm is it in Key West in March?: Daytime highs averaged 24.7 °C, night-time lows 23.4 °C. The highest value of the past 10 years was 26.9 °C (3 Mar 2023), the lowest 17.6 °C (16 Mar 2017).
How often does it rain in Key West in March?: On average there were 4.6 rain days (at least 1 mm) with 34.9 mm of precipitation in total. In 3 of 10 years there was no rain day at all.

Check your exact travel dates

Choose your travel period – we show the weather for exactly those days.

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)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)