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September weather forecast in Key West

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

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

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	761 mmHg		80%
	6.6 m/s		+30

31 August, Sunday. day, 29°; night, 27°; rain

1 September, mon

	761 mmHg		79%
	6.2 m/s		+30

1 September, Monday. day, 29°; night, 27°; rain

2 September, tue

	761 mmHg		79%
	6.2 m/s		+30

2 September, Tuesday. day, 29°; night, 27°; overcast

3 September, wed

	761 mmHg		79%
	5.8 m/s		+30

3 September, Wednesday. day, 29°; night, 27°; clear

4 September, thu

	760 mmHg		78%
	5.9 m/s		+30

4 September, Thursday. day, 29°; night, 27°; rain

5 September, fri

	761 mmHg		79%
	6.2 m/s		+30

5 September, Friday. day, 29°; night, 27°; rain

6 September, sat

	761 mmHg		80%
	6.1 m/s		+30

6 September, Saturday. day, 28°; night, 27°; rain

7 September, sun

	761 mmHg		79%
	5.9 m/s		+30

7 September, Sunday. day, 28°; night, 27°; rain

8 September, mon

	760 mmHg		79%
	6.2 m/s		+30

8 September, Monday. day, 28°; night, 27°; partly cloudy

9 September, tue

	760 mmHg		79%
	6.8 m/s		+30

9 September, Tuesday. day, 28°; night, 27°; rain

10 September, wed

	760 mmHg		80%
	7.2 m/s		+30

10 September, Wednesday. day, 28°; night, 27°; rain

11 September, thu

	761 mmHg		79%
	6.6 m/s		+30

11 September, Thursday. day, 28°; night, 27°; overcast

12 September, fri

	761 mmHg		79%
	6.6 m/s		+30

12 September, Friday. day, 28°; night, 27°; rain

13 September, sat

	760 mmHg		79%
	6.6 m/s		+30

13 September, Saturday. day, 28°; night, 27°; rain

14 September, sun

	760 mmHg		79%
	6.7 m/s		+30

14 September, Sunday. day, 28°; night, 27°; partly cloudy

15 September, mon

	761 mmHg		79%
	6.3 m/s		+30

15 September, Monday. day, 28°; night, 27°; clear

16 September, tue

	761 mmHg		78%
	5.9 m/s		+30

16 September, Tuesday. day, 28°; night, 27°; clear

17 September, wed

	761 mmHg		78%
	5.7 m/s		+30

17 September, Wednesday. day, 28°; night, 27°; clear

18 September, thu

	760 mmHg		78%
	5.6 m/s		+30

18 September, Thursday. day, 28°; night, 27°; rain

19 September, fri

	760 mmHg		78%
	6 m/s		+30

19 September, Friday. day, 28°; night, 27°; clear

20 September, sat

	760 mmHg		78%
	6.9 m/s		+30

20 September, Saturday. day, 28°; night, 27°; rain

21 September, sun

	760 mmHg		79%
	7 m/s		+30

21 September, Sunday. day, 28°; night, 27°; rain

22 September, mon

	760 mmHg		80%
	6.8 m/s		+30

22 September, Monday. day, 28°; night, 27°; rain

23 September, tue

	760 mmHg		80%
	6.7 m/s		+30

23 September, Tuesday. day, 28°; night, 27°; rain

24 September, wed

	760 mmHg		79%
	6.9 m/s		+30

24 September, Wednesday. day, 28°; night, 27°; rain

25 September, thu

	760 mmHg		80%
	7.7 m/s		+30

25 September, Thursday. day, 28°; night, 27°; rain

26 September, fri

	760 mmHg		81%
	7.6 m/s		+30

26 September, Friday. day, 28°; night, 27°; rain

27 September, sat

	760 mmHg		81%
	7 m/s		+30

27 September, Saturday. day, 28°; night, 26°; rain

28 September, sun

	760 mmHg		80%
	6.6 m/s		+30

28 September, Sunday. day, 28°; night, 27°; clear

29 September, mon

	760 mmHg		80%
	6.7 m/s		+30

29 September, Monday. day, 28°; night, 27°; rain

30 September, tue

	760 mmHg		79%
	6.7 m/s		+30

30 September, Tuesday. day, 28°; night, 26°; partly cloudy

1 October, wed

	760 mmHg		79%
	7.2 m/s		+30

1 October, Wednesday. day, 28°; night, 26°; rain

2 October, thu

	760 mmHg		78%
	7.4 m/s		+29

2 October, Thursday. day, 27°; night, 26°; rain

3 October, fri

	760 mmHg		77%
	7.6 m/s		+29

3 October, Friday. day, 28°; night, 26°; rain

4 October, sat

	760 mmHg		78%
	7.9 m/s		+29

4 October, Saturday. day, 28°; night, 26°; rain

Average data for 10 years

Key West September

6

sunny days

19

days with precipitation

10

cloudy days

6 sunny days; 19 days with precipitation; 10 cloudy days;

79

%

air humidity

4.69

m/s

WindSE

159

mm of precipitation

(19% of annual average)

+30

°C

Water temperature

air humidity 79%; 159 millimeters of precipitation (19% of annual average); Wind south-easterly 4.69 Meters per second; Water temperature +30°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

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Average data for 10 years

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Daytime temperature

Night-time temperature

Cities near you

Varadero
Havana
Miami
Cayo Coco
Tampa
Cayo Guillermo
Miami Beach
Madeira Beach
Sarasota

Cities with similar weather in September

Pattaya
Nha Trang
Sanya
Hurgada
Bangkok
Punta Cana
Cancun
Hong Kong
Boca Chica

The weather forecast for September 2025 is based on historical data from the past 10 years.

September in Key West is the rainiest month of the year. In September, the weather in Key West is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Key West has 19 rainy, 6 sunny, 3 partly cloudy, and 2 cloudy days in September. The rains are usually heavy. September as well as June, July, and August is considered the most uncomfortable time to visit Key West.

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