Key West in Spring
In spring (March, April and May), Key West sees average daytime highs around 77°F and overnight lows near 74°F, with 5.2 in of rain over about 17 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs climb from about 74°F in early March to 81°F by late May. The sky is clear or mostly clear about 66% of the time across spring, and the air most often feels oppressive.
Spring is Key West's best season of the year to visit on our travel score. Key West has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Key West's year-round climate.
- Avg daytime high
- 77°F
- 3rd-warmest season
- Avg overnight low
- 74°F
- Rainfall
- 5.2 in
- 17 wet days
- Avg wind
- 13 mph
- Travel score
- 8.0
- best season of the year
- Months
- Mar · Apr · May
Temperature in Key West in Spring
Over the season highs climb from about 74°F in early March to 81°F by late May.
A typical spring day in Key West reaches about 77°F and drops to 74°F overnight. The warmest of the three months is May, the coolest March.
How spring really feels in Key West
Once humidity and wind are folded in, spring brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
spring sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Key West weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 73° / 69° | 1.5 | 5.7 | 10.6 | 7.8 |
| Feb | 73° / 70° | 1.2 | 4 | 11.1 | 8.1 |
| Mar | 74° / 71° | 1.0 | 4.2 | 11.8 | 8.4 |
| Apr | 77° / 74° | 1.5 | 4.5 | 12.6 | 8.3 |
| May | 80° / 77° | 2.6 | 7.9 | 13.2 | 7.3 |
| Jun | 83° / 80° | 4.1 | 12.7 | 13.5 | 5.7 |
| Jul | 84° / 81° | 2.5 | 12.9 | 13.4 | 5.3 |
| Aug | 84° / 81° | 4.1 | 16.1 | 12.9 | 4.8 |
| Sep | 83° / 80° | 5.4 | 17.7 | 12.2 | 4.7 |
| Oct | 81° / 78° | 4.6 | 12.7 | 11.4 | 6.2 |
| Nov | 77° / 74° | 1.5 | 5.8 | 10.8 | 7.8 |
| Dec | 75° / 71° | 1.3 | 5.1 | 10.5 | 8.0 |
Cloud cover in Spring
The sky is clear or mostly clear about 66% of the time across spring.
Chance of precipitation in Spring
Key West gets around 5.2 in of rain over 17 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 13 mph across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 30 min in early March to 13 h 24 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 6.5 kWh/m².
Hazard calendar for Key West
In spring, Key West overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Key West sits in the Atlantic hurricane belt; the season peaks August–October.
Key West's rainy season runs May–October, when most of the year's rain falls.
Is spring a good time to visit Key West?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is one of the better times to visit Key West for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Key West in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Key West sees daytime highs around 77°F and nights near 74°F. Pack sun protection. Worth having: light clothes and a windbreaker. About 17 days see rain.
Sea temperature near Key West in Spring
The nearest coast averages about 77°F across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 86°F and coldest in February near 73°F.
The water stays above 68°F all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 73 | 73 | 74 | 77 | 80 | 83 | 85 | 86 | 85 | 83 | 78 | 75 |
| Comfort | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 73 | Refreshing |
| Feb | 73 | Refreshing |
| Mar | 74 | Refreshing |
| Apr | 77 | Warm |
| May | 80 | Warm |
| Jun | 83 | Tropical |
| Jul | 85 | Tropical |
| Aug | 86 | Tropical |
| Sep | 85 | Tropical |
| Oct | 83 | Tropical |
| Nov | 78 | Warm |
| Dec | 75 | Warm |
UV index in Key West in Spring
Clear-sky midday UV across spring averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Key West peaks around July 18 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 5 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 6 | 8 | 10 | 11 | 11 | 11 | 12 | 12 | 11 | 9 | 6 | 5 |
| Level | High | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 8 | Very high |
| Mar | 10 | Very high |
| Apr | 11 | Extreme |
| May | 11 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 11 | Extreme |
| Oct | 9 | Very high |
| Nov | 6 | High |
| Dec | 5 | High |
Air quality in Key West in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in Key West is worst in July — around 18 µg/m³ PM2.5 (moderate), about 4.1× the cleanest month (December, 4 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 5 | 5 | 6 | 8 | 9 | 15 | 18 | 16 | 10 | 7 | 5 | 4 |
| Level | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 5 | Good |
| Feb | 5 | Good |
| Mar | 6 | Good |
| Apr | 8 | Good |
| May | 9 | Good |
| Jun | 15 | Moderate |
| Jul | 18 | Moderate |
| Aug | 16 | Moderate |
| Sep | 10 | Good |
| Oct | 7 | Good |
| Nov | 5 | Good |
| Dec | 4 | Good |
Where is Key West?
Key West sits at 24.6°N, 81.8°W, 3 ft above sea level, in United States. The nearest listed city is Marco Island, 96 mi away.
Topography around Key West
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Key West.
Within 2 miles, the terrain around Key West has only modest variations in elevation — a maximum elevation change of 39 ft around an average of 3 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 75 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 52 ft.
The land around Key West is covered by water (64%) and artificial surfaces (26%) within 2 miles, water (95%) within 10 miles, and water (98%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Key West (24.5552°, -81.7816°, elevation 3 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.