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September weather forecast in Grand Case

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		81%
	7.9 m/s		+29

31 August, Sunday. day, 28°; night, 27°; rain

1 September, mon

	761 mmHg		82%
	7.4 m/s		+29

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

2 September, tue

	760 mmHg		81%
	7.5 m/s		+29

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

3 September, wed

	760 mmHg		82%
	7.4 m/s		+29

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

4 September, thu

	760 mmHg		81%
	7.7 m/s		+29

4 September, Thursday. day, 28°; night, 27°; clear

5 September, fri

	760 mmHg		81%
	7.8 m/s		+29

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

6 September, sat

	760 mmHg		82%
	8.8 m/s		+29

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

7 September, sun

	760 mmHg		82%
	8.2 m/s		+29

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

8 September, mon

	760 mmHg		81%
	7.4 m/s		+29

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

9 September, tue

	760 mmHg		81%
	7.3 m/s		+29

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

10 September, wed

	761 mmHg		82%
	7.5 m/s		+29

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

11 September, thu

	760 mmHg		82%
	7.7 m/s		+29

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

12 September, fri

	760 mmHg		81%
	7.7 m/s		+29

12 September, Friday. day, 28°; night, 27°; partly cloudy

13 September, sat

	760 mmHg		81%
	7.4 m/s		+29

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

14 September, sun

	760 mmHg		82%
	7.7 m/s		+29

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

15 September, mon

	761 mmHg		82%
	7.6 m/s		+29

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

16 September, tue

	761 mmHg		81%
	7.9 m/s		+29

16 September, Tuesday. day, 28°; night, 27°; partly cloudy

17 September, wed

	760 mmHg		81%
	7.7 m/s		+29

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

18 September, thu

	760 mmHg		82%
	7.1 m/s		+29

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

19 September, fri

	760 mmHg		82%
	7.2 m/s		+29

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

20 September, sat

	760 mmHg		81%
	7.1 m/s		+29

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

21 September, sun

	760 mmHg		81%
	7.2 m/s		+29

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

22 September, mon

	760 mmHg		80%
	7 m/s		+29

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

23 September, tue

	760 mmHg		81%
	7.1 m/s		+29

23 September, Tuesday. day, 28°; night, 27°; partly cloudy

24 September, wed

	760 mmHg		81%
	7.1 m/s		+29

24 September, Wednesday. day, 28°; night, 27°; partly cloudy

25 September, thu

	760 mmHg		81%
	7 m/s		+29

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

26 September, fri

	760 mmHg		81%
	6.6 m/s		+29

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

27 September, sat

	760 mmHg		81%
	7 m/s		+29

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

28 September, sun

	760 mmHg		80%
	6.9 m/s		+29

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

29 September, mon

	760 mmHg		81%
	6.9 m/s		+29

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

30 September, tue

	760 mmHg		80%
	7 m/s		+29

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

1 October, wed

	760 mmHg		81%
	7.2 m/s		+29

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

2 October, thu

	760 mmHg		81%
	7.5 m/s		+29

2 October, Thursday. day, 28°; night, 27°; rain

3 October, fri

	760 mmHg		81%
	7.2 m/s		+29

3 October, Friday. day, 28°; night, 27°; partly cloudy

4 October, sat

	760 mmHg		81%
	7.5 m/s		+29

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

Average data for 10 years

Grand Case September

5

sunny days

21

days with precipitation

8

cloudy days

5 sunny days; 21 days with precipitation; 8 cloudy days;

81

%

air humidity

6

m/s

WindE

135

mm of precipitation

(15% of annual average)

+29

°C

Water temperature

air humidity 81%; 135 millimeters of precipitation (15% of annual average); Wind easterly 6 Meters per second; Water temperature +29°

Weather graphs for September

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

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

SE

SE

SE

SE

E

E

E

E

E

E

E

E

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Rio Grande
Charlotte Amalie
San Juan
Carolina
The Valley
Basseterre
Road Town
Roseau
Cyril E. King Airport

Cities with similar weather in September

Santo Domingo
Varadero
Havana
Ko Chang
Mumbai
Kinshasa
Boca Chica
Da Nang
Cam Ranh Bay

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

September in Grand Case is the cloudiest and the hottest month of the year. In September, the weather in Grand Case is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Grand Case has 21 rainy, 5 sunny, and 4 partly cloudy days in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Grand Case.

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