Key West weather in April

In April, Key West sees average daytime highs of 77°F and overnight lows near 74°F, with 1.5 in of rain across 4.5 wet days and about 12.6 hours of daylight. It is the 8th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 77°F through the month. The sky is clear or mostly clear about 68% of the time in April, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of April to 12 h 54 min by month's end. Set against the rest of the year, April is Key West's 2nd-clearest and 7th-windiest month. For the whole year in context, see Key West's year-round climate.

Daytime high
77°
8th warmest
Overnight low
74°
5th coldest
Rainfall
1.5 in
4.5 wet days
Daylight
12 h 36 min
6:10 AM – 6:45 PM
Cloud cover
32%
2nd clearest
Wind
13 mph
7th windiest
Solar energy
6.78 kWh/m²
Travel score
8.3
out of 10

Key West is county seat of Monroe County, Florida, United States.

Density
1,373/km²
people per km²
Founded
1828

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 77°F through the month.

A typical April day in Key West reaches about 77°F in the afternoon and slips back to 74°F overnight — a 3°F spread between the day's warmth and the night's chill. On most days the high lands between 74°F and 79°F. Set against its neighbours, April runs about 2°F warmer than March and about 3°F cooler than May.

65°70°75°80°85°151015202530
Avg high (°F)Avg low (°F)
17673
27673
37673
47673
57674
67674
77674
87674
97674
107674
117674
127774
137774
147774
157774
167774
177774
187774
197774
207775
217775
227775
237775
247775
257875
267875
277875
287875
297876
307876

How April really feels in Key West

Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

April 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 April compares with the rest of the year at a glance. April is the 8th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan73° / 69°1.55.710.67.8
Feb73° / 70°1.2411.18.1
Mar74° / 71°1.04.211.88.4
Apr77° / 74°1.54.512.68.3
May80° / 77°2.67.913.27.3
Jun83° / 80°4.112.713.55.7
Jul84° / 81°2.512.913.45.3
Aug84° / 81°4.116.112.94.8
Sep83° / 80°5.417.712.24.7
Oct81° / 78°4.612.711.46.2
Nov77° / 74°1.55.810.87.8
Dec75° / 71°1.35.110.58.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 68% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 11% of April, with mostly cloudy or overcast conditions the remaining 20%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18119
28119
38119
48119
58119
68119
78119
88119
98020
107921
117921
127921
137921
147921
157921
168020
178020
188020
198020
207921
217921
227921
237921
247822
257822
267822
277822
287921
297921
307921

Chance of precipitation in April

Any precipitation

Key West gets around 1.5 in of rain over 4.5 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 15% and peaks near 18% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
112
212
312
412
512
612
713
813
913
1014
1114
1214
1314
1414
1514
1614
1714
1814
1914
2015
2115
2216
2316
2417
2517
2618
2718
2818
2918
3018

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the oppressive band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 70% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
14102432290
24102432300
33102332310
43102332320
53102232321
63102232321
73102232321
82102133331
92102133331
102102133331
112102033331
122102033331
132102034331
142102034331
152102034322
162102034322
172102034322
18291934332
19291935332
20291835342
21291835343
22281735353
23281734363
24271634373
25271634383
26261634394
27261534404
28151533414
29151433424
30151433434

Wind in April

Winds average 13 mph in April.

Across April, daily wind ranges from about 13 mph on the calmest days to 14 mph at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (mph)Feels
113breezy
213breezy
313breezy
413breezy
514breezy
614breezy
714breezy
814breezy
914breezy
1014breezy
1114breezy
1214breezy
1314breezy
1414breezy
1514breezy
1614breezy
1714breezy
1813breezy
1913breezy
2013breezy
2113breezy
2213breezy
2313breezy
2413breezy
2513breezy
2613breezy
2713breezy
2813breezy
2913breezy
3013breezy

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 12 min at the start of April to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over April. Sunrise moves from 6:25 AM to 5:58 AM, and sunset from 6:38 PM to 6:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:256:38
212.26:246:39
312.36:236:39
412.36:226:39
512.36:216:40
612.36:206:40
712.46:196:41
812.46:186:41
912.46:176:42
1012.46:166:42
1112.56:156:42
1212.56:146:43
1312.56:136:43
1412.56:126:44
1512.56:116:44
1612.66:106:45
1712.66:096:45
1812.66:086:45
1912.66:076:46
2012.76:066:46
2112.76:066:47
2212.76:056:47
2312.76:046:48
2412.86:036:48
2512.86:026:49
2612.86:016:49
2712.86:006:50
2812.86:006:50
2912.95:596:51
3012.95:586:51

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 6.78 kWh/m².

For context, solar energy here swings from a low near 3.66 kWh/m² to a high of 6.9 kWh/m² in May across the year — April's 6.78 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.5Intense
46.6Intense
56.6Intense
66.6Intense
76.6Intense
86.7Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.8Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.8Intense
196.9Intense
206.9Intense
216.9Intense
226.9Intense
236.9Intense
246.9Intense
256.9Intense
266.9Intense
276.9Intense
287.0Intense
297.0Intense
307.0Intense
Planning a trip in April

Hazard calendar for Key West

In seasonPeak

None of Key West's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

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.

Atlantic hurricane
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit Key West?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

8.3
Sightseeing
2nd-best month of the year
7.4
Beach & pool
1st-best month of the year

April 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 April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Key West sees daytime highs around 77°F and nights near 74°F. Pack sun protection. Worth having: light clothes and a windbreaker. About 5 days see rain.

sun protectionlight clothesa windbreaker

Sea temperature near Key West in April

The nearest coast averages about 77°F in April — 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.

70°75°80°85°90°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan73Refreshing
Feb73Refreshing
Mar74Refreshing
Apr77Warm
May80Warm
Jun83Tropical
Jul85Tropical
Aug86Tropical
Sep85Tropical
Oct83Tropical
Nov78Warm
Dec75Warm

UV index in Key West in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 11 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJul 18UV 12Dec 18UV 5
UV index (midday)Level
Jan6High
Feb8Very high
Mar10Very high
Apr11Extreme
May11Extreme
Jun11Extreme
Jul12Extreme
Aug12Extreme
Sep11Extreme
Oct9Very high
Nov6High
Dec5High

Air quality in Key West in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April 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).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1818 µg/m³Dec 144 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb5Good
Mar6Good
Apr8Good
May9Good
Jun15Moderate
Jul18Moderate
Aug16Moderate
Sep10Good
Oct7Good
Nov5Good
Dec4Good
Location & terrain

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.

2 miles
39 ft
10 miles
75 ft
50 miles
52 ft
treesgrasslandartificial surfacesbare terrainwatermangroves
April weather nearby: Marco Island 96 mi · Santa Cruz del Norte 98 mi · Alamar 101 mi · Cojímar 101 mi · Ciudad Camilo Cienfuegos 103 mi · Varadero 103 mi · Homestead 103 mi · Guanabacoa 104 mi

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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).