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September weather forecast in Key Largo

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%
	5.4 m/s		+30

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

1 September, mon

	761 mmHg		80%
	5 m/s		+30

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

2 September, tue

	761 mmHg		80%
	5.2 m/s		+30

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

3 September, wed

	761 mmHg		80%
	5.2 m/s		+30

3 September, Wednesday. day, 29°; night, 27°; partly cloudy

4 September, thu

	760 mmHg		79%
	5.2 m/s		+30

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

5 September, fri

	761 mmHg		80%
	5.3 m/s		+30

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

6 September, sat

	761 mmHg		81%
	5.2 m/s		+30

6 September, Saturday. day, 29°; night, 26°; rain

7 September, sun

	761 mmHg		80%
	5.1 m/s		+30

7 September, Sunday. day, 29°; night, 26°; rain

8 September, mon

	760 mmHg		80%
	5.4 m/s		+30

8 September, Monday. day, 29°; night, 26°; partly cloudy

9 September, tue

	760 mmHg		81%
	5.6 m/s		+30

9 September, Tuesday. day, 28°; night, 26°; rain

10 September, wed

	760 mmHg		81%
	6 m/s		+30

10 September, Wednesday. day, 29°; night, 26°; rain

11 September, thu

	761 mmHg		81%
	5.4 m/s		+30

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

12 September, fri

	761 mmHg		81%
	5.3 m/s		+30

12 September, Friday. day, 29°; night, 26°; rain

13 September, sat

	760 mmHg		80%
	5.3 m/s		+30

13 September, Saturday. day, 29°; night, 27°; partly cloudy

14 September, sun

	760 mmHg		79%
	5.4 m/s		+30

14 September, Sunday. day, 29°; night, 27°; rain

15 September, mon

	761 mmHg		80%
	5.1 m/s		+30

15 September, Monday. day, 29°; night, 26°; rain

16 September, tue

	761 mmHg		80%
	4.6 m/s		+29

16 September, Tuesday. day, 29°; night, 26°; partly cloudy

17 September, wed

	761 mmHg		79%
	4.8 m/s		+29

17 September, Wednesday. day, 29°; night, 26°; clear

18 September, thu

	760 mmHg		80%
	4.69 m/s		+29

18 September, Thursday. day, 29°; night, 26°; rain

19 September, fri

	760 mmHg		80%
	4.9 m/s		+29

19 September, Friday. day, 29°; night, 26°; rain

20 September, sat

	760 mmHg		80%
	5.5 m/s		+30

20 September, Saturday. day, 29°; night, 26°; rain

21 September, sun

	760 mmHg		81%
	5.6 m/s		+30

21 September, Sunday. day, 28°; night, 26°; rain

22 September, mon

	760 mmHg		80%
	5.4 m/s		+30

22 September, Monday. day, 28°; night, 26°; clear

23 September, tue

	760 mmHg		80%
	5.1 m/s		+30

23 September, Tuesday. day, 28°; night, 26°; rain

24 September, wed

	760 mmHg		80%
	5.4 m/s		+30

24 September, Wednesday. day, 28°; night, 26°; rain

25 September, thu

	760 mmHg		80%
	6.2 m/s		+30

25 September, Thursday. day, 28°; night, 26°; rain

26 September, fri

	760 mmHg		81%
	6.1 m/s		+30

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

27 September, sat

	760 mmHg		81%
	5.6 m/s		+30

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

28 September, sun

	760 mmHg		81%
	5.6 m/s		+30

28 September, Sunday. day, 28°; night, 26°; rain

29 September, mon

	760 mmHg		82%
	5.4 m/s		+29

29 September, Monday. day, 28°; night, 26°; rain

30 September, tue

	760 mmHg		81%
	5.4 m/s		+29

30 September, Tuesday. day, 28°; night, 26°; rain

1 October, wed

	760 mmHg		80%
	5.7 m/s		+29

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

2 October, thu

	760 mmHg		80%
	6.2 m/s		+29

2 October, Thursday. day, 28°; night, 26°; rain

3 October, fri

	760 mmHg		79%
	6 m/s		+29

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

4 October, sat

	760 mmHg		78%
	6.2 m/s		+29

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

Average data for 10 years

Key Largo September

3

sunny days

22

days with precipitation

12

cloudy days

3 sunny days; 22 days with precipitation; 12 cloudy days;

80

%

air humidity

3.7

m/s

WindSE

153

mm of precipitation

(16% of annual average)

+30

°C

Water temperature

air humidity 80%; 153 millimeters of precipitation (16% of annual average); Wind south-easterly 3.7 Meters per second; Water temperature +30°

Weather graphs for September

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

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SE

1

Average data for 10 years

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Daytime temperature

Night-time temperature

Cities near you

Varadero
Havana
Miami
Cayo Coco
Orlando
Tampa
Cayo Guillermo
Nassau
Miami Beach

Cities with similar weather in September

Pattaya
Nha Trang
Sharm-El-Sheikh
Sanya
Hurgada
Bangkok
Punta Cana
Singapore
Cancun

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

In September, the weather in Key Largo is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Key Largo has 22 rainy, 4 partly cloudy, 3 sunny, and 1 cloudy day in September. The rains are usually heavy. September as well as June, July, and August is considered the most uncomfortable time to visit Key Largo.

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