Annual mean 26°C · wettest around September · prevailing wind E
Warmest
31.2 °C
Coldest
21.8 °C
Wettest
8%
Windiest
5.4 m/s
Prevailing
E
4.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Key West over the whole year is 26°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 21°C. Key West has no sharply defined rainy season: the chance of rain on a given day runs from 2% in March, the driest month, to 6% in September, the wettest. Winds in Key West are highest in April, averaging 4.6 m/s (17 km/h), and lightest in September, at 3.4 m/s (12 km/h). The prevailing wind is from the E. The clearest skies in Key West come in March, when the sky is typically 35% covered; January is the cloudiest month, at 47%.
Month by month Key West climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
22°C
21°C
21°C
4%
47%
4.5 m/s
70
29
53
February
24°C
22°C
24°C
2%
39%
4.3 m/s
67
50
35
March
25°C
23°C
24°C
2%
35%
4.5 m/s
65
50
34
April
27°C
25°C
27°C
3%
37%
4.6 m/s
52
64
19
May
28°C
26°C
30°C
5%
39%
3.8 m/s
25
72
5
June
30°C
28°C
32°C
5%
42%
3.7 m/s
8
56
1
July
31°C
29°C
34°C
5%
38%
3.5 m/s
3
43
1
August
31°C
29°C
34°C
6%
41%
3.5 m/s
3
39
0
September
30°C
28°C
33°C
6%
40%
3.4 m/s
5
45
0
October
29°C
27°C
30°C
6%
44%
4.3 m/s
21
63
6
November
26°C
24°C
27°C
3%
39%
4.4 m/s
54
61
21
December
24°C
22°C
24°C
4%
40%
4.4 m/s
63
47
36
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Key West weather by season
Year round, Key West has days of about 22°C at their warmest in January, its coolest month, and 31°C in August, its warmest; the coolest hours of the day run from 21°C to 29°C through the year, and the average temperature over the year is 26°C around the clock. Rain is most likely around September and least likely around March. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Key West weather in winterDecember to February
High 24°CLow 22°CRain 3%
Winter in Key West has typical daily highs of about 24°C and lows of about 22°C, with a 3% chance of rain on a given day.
Key West weather in springMarch to May
High 27°CLow 25°CRain 3%
Spring in Key West has typical daily highs of about 27°C and lows of about 25°C, with a 3% chance of rain on a given day.
Key West weather in summerJune to August
High 30°CLow 29°CRain 5%
Summer in Key West has typical daily highs of about 30°C and lows of about 29°C, with a 5% chance of rain on a given day.
Key West weather in autumnSeptember to November
High 28°CLow 26°CRain 5%
Autumn in Key West has typical daily highs of about 28°C and lows of about 26°C, with a 5% chance of rain on a given day.
When is the rainy season in Key West?
Key West has no sharply defined rainy season: the chance of rain on a given day runs from 2% in March, the driest month, to 6% in September, the wettest.
What time of year is Key West windiest?
Winds in Key West are highest in April, averaging 4.6 m/s (17 km/h), and lightest in September, at 3.4 m/s (12 km/h). The prevailing wind is from the E.
What is the average temperature in Key West year round?
The average temperature in Key West over the whole year is 26°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 21°C.