Key West climate guide

Temperature in Key West (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
24°C maximum daytime temperature in January in Key West24
24°C maximum daytime temperature in February in Key West24
26°C maximum daytime temperature in March in Key West26
28°C maximum daytime temperature in April in Key West28
29°C maximum daytime temperature in May in Key West29
31°C maximum daytime temperature in June in Key West31
32°C maximum daytime temperature in July in Key West32
32°C maximum daytime temperature in August in Key West32
31°C maximum daytime temperature in September in Key West31
29°C maximum daytime temperature in October in Key West29
27°C maximum daytime temperature in November in Key West27
24°C maximum daytime temperature in December in Key West24
Min temperature (night-time)
17°C minimum night-time temperature in January in Key West17
17°C minimum night-time temperature in February in Key West17
20°C minimum night-time temperature in March in Key West20
21°C minimum night-time temperature in April in Key West21
23°C minimum night-time temperature in May in Key West23
25°C minimum night-time temperature in June in Key West25
25°C minimum night-time temperature in July in Key West25
26°C minimum night-time temperature in August in Key West26
25°C minimum night-time temperature in September in Key West25
23°C minimum night-time temperature in October in Key West23
20°C minimum night-time temperature in November in Key West20
18°C minimum night-time temperature in December in Key West18
Sea temperature
23°C sea temperature in January in Key West23
22°C sea temperature in February in Key West22
23°C sea temperature in March in Key West23
25°C sea temperature in April in Key West25
27°C sea temperature in May in Key West27
29°C sea temperature in June in Key West29
30°C sea temperature in July in Key West30
30°C sea temperature in August in Key West30
29°C sea temperature in September in Key West29
28°C sea temperature in October in Key West28
26°C sea temperature in November in Key West26
24°C sea temperature in December in Key West24

Sunshine & Daylight in Key West

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
11 hours of daylight per day in January in Key West11
11 hours of daylight per day in February in Key West11
12 hours of daylight per day in March in Key West12
13 hours of daylight per day in April in Key West13
13 hours of daylight per day in May in Key West13
14 hours of daylight per day in June in Key West14
13 hours of daylight per day in July in Key West13
13 hours of daylight per day in August in Key West13
12 hours of daylight per day in September in Key West12
12 hours of daylight per day in October in Key West12
11 hours of daylight per day in November in Key West11
11 hours of daylight per day in December in Key West11

Rainfall in Key West

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
6 days with some rainfall in January in Key West6
6 days with some rainfall in February in Key West6
5 days with some rainfall in March in Key West5
4 days with some rainfall in April in Key West4
8 days with some rainfall in May in Key West8
12 days with some rainfall in June in Key West12
12 days with some rainfall in July in Key West12
15 days with some rainfall in August in Key West15
15 days with some rainfall in September in Key West15
11 days with some rainfall in October in Key West11
7 days with some rainfall in November in Key West7
6 days with some rainfall in December in Key West6
Average monthly rainfall (mm)
47 mm monthly rainfall in January in Key West47
48 mm monthly rainfall in February in Key West48
40 mm monthly rainfall in March in Key West40
46 mm monthly rainfall in April in Key West46
107 mm monthly rainfall in May in Key West107
144 mm monthly rainfall in June in Key West144
104 mm monthly rainfall in July in Key West104
125 mm monthly rainfall in August in Key West125
166 mm monthly rainfall in September in Key West166
115 mm monthly rainfall in October in Key West115
51 mm monthly rainfall in November in Key West51
45 mm monthly rainfall in December in Key West45

More climate for Key West

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 6 (High) in January in Key West6
UV (maximum) index 8 (Very High) in February in Key West8
UV (maximum) index 10 (Very High) in March in Key West10
UV (maximum) index 11 (Extreme) in April in Key West11
UV (maximum) index 11 (Extreme) in May in Key West11
UV (maximum) index 11 (Extreme) in June in Key West11
UV (maximum) index 11 (Extreme) in July in Key West11
UV (maximum) index 11 (Extreme) in August in Key West11
UV (maximum) index 10 (Very High) in September in Key West10
UV (maximum) index 9 (Very High) in October in Key West9
UV (maximum) index 7 (High) in November in Key West7
UV (maximum) index 6 (High) in December in Key West6
Heat & Humidity
No heat & humidity in January in Key West0
No heat & humidity in February in Key West0
Low heat & humidity in March in Key WestL
Moderate heat & humidity in April in Key WestM
High heat & humidity in May in Key WestH
High heat & humidity in June in Key WestH
Very high heat & humidity in July in Key WestVH
Very high heat & humidity in August in Key WestVH
Very high heat & humidity in September in Key WestVH
High heat & humidity in October in Key WestH
Moderate heat & humidity in November in Key WestM
Low heat & humidity in December in Key WestL

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

The climate guide for Key West, Florida shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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Metric (°C / mm)  |  Imperial (°F / inches)

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