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September weather forecast in São Luís

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

	757 mmHg		79%
	6.9 m/s		+29

31 August, Sunday. day, 29°; night, 25°; clear

1 September, mon

	757 mmHg		79%
	6.6 m/s		+29

1 September, Monday. day, 29°; night, 25°; rain

2 September, tue

	757 mmHg		79%
	6.5 m/s		+30

2 September, Tuesday. day, 29°; night, 25°; clear

3 September, wed

	757 mmHg		79%
	6.7 m/s		+30

3 September, Wednesday. day, 29°; night, 25°; rain

4 September, thu

	757 mmHg		78%
	6.9 m/s		+30

4 September, Thursday. day, 29°; night, 25°; clear

5 September, fri

	757 mmHg		79%
	7.1 m/s		+29

5 September, Friday. day, 29°; night, 25°; clear

6 September, sat

	757 mmHg		78%
	6.8 m/s		+29

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

7 September, sun

	757 mmHg		79%
	6.8 m/s		+30

7 September, Sunday. day, 29°; night, 25°; rain

8 September, mon

	757 mmHg		78%
	7 m/s		+30

8 September, Monday. day, 29°; night, 25°; rain

9 September, tue

	757 mmHg		78%
	7.1 m/s		+30

9 September, Tuesday. day, 29°; night, 25°; rain

10 September, wed

	757 mmHg		78%
	7.2 m/s		+30

10 September, Wednesday. day, 29°; night, 25°; clear

11 September, thu

	757 mmHg		78%
	7.1 m/s		+30

11 September, Thursday. day, 29°; night, 26°; clear

12 September, fri

	757 mmHg		78%
	7.3 m/s		+30

12 September, Friday. day, 29°; night, 25°; clear

13 September, sat

	757 mmHg		78%
	7.2 m/s		+30

13 September, Saturday. day, 29°; night, 25°; clear

14 September, sun

	757 mmHg		79%
	6.7 m/s		+30

14 September, Sunday. day, 29°; night, 25°; clear

15 September, mon

	757 mmHg		79%
	7.1 m/s		+30

15 September, Monday. day, 29°; night, 25°; rain

16 September, tue

	757 mmHg		79%
	7.2 m/s		+30

16 September, Tuesday. day, 29°; night, 25°; rain

17 September, wed

	757 mmHg		79%
	7.1 m/s		+30

17 September, Wednesday. day, 29°; night, 25°; rain

18 September, thu

	757 mmHg		78%
	7 m/s		+30

18 September, Thursday. day, 29°; night, 25°; clear

19 September, fri

	757 mmHg		79%
	6.8 m/s		+30

19 September, Friday. day, 29°; night, 25°; clear

20 September, sat

	757 mmHg		79%
	7 m/s		+30

20 September, Saturday. day, 29°; night, 25°; rain

21 September, sun

	757 mmHg		78%
	7 m/s		+30

21 September, Sunday. day, 29°; night, 25°; partly cloudy

22 September, mon

	757 mmHg		78%
	6.9 m/s		+30

22 September, Monday. day, 29°; night, 25°; clear

23 September, tue

	757 mmHg		78%
	7 m/s		+30

23 September, Tuesday. day, 29°; night, 25°; partly cloudy

24 September, wed

	757 mmHg		78%
	6.9 m/s		+30

24 September, Wednesday. day, 29°; night, 25°; partly cloudy

25 September, thu

	757 mmHg		78%
	6.7 m/s		+30

25 September, Thursday. day, 29°; night, 25°; clear

26 September, fri

	757 mmHg		78%
	6.8 m/s		+30

26 September, Friday. day, 29°; night, 25°; partly cloudy

27 September, sat

	757 mmHg		78%
	7 m/s		+30

27 September, Saturday. day, 29°; night, 25°; clear

28 September, sun

	757 mmHg		78%
	7.1 m/s		+30

28 September, Sunday. day, 29°; night, 25°; partly cloudy

29 September, mon

	757 mmHg		78%
	6.9 m/s		+30

29 September, Monday. day, 29°; night, 25°; clear

30 September, tue

	757 mmHg		78%
	6.8 m/s		+30

30 September, Tuesday. day, 29°; night, 25°; clear

1 October, wed

	756 mmHg		78%
	6.9 m/s		+30

1 October, Wednesday. day, 29°; night, 25°; clear

2 October, thu

	756 mmHg		78%
	6.9 m/s		+30

2 October, Thursday. day, 29°; night, 25°; clear

3 October, fri

	756 mmHg		78%
	6.8 m/s		+30

3 October, Friday. day, 29°; night, 25°; clear

4 October, sat

	756 mmHg		78%
	6.8 m/s		+30

4 October, Saturday. day, 29°; night, 25°; clear

Average data for 10 years

São Luís September

16

sunny days

9

days with precipitation

5

cloudy days

16 sunny days; 9 days with precipitation; 5 cloudy days;

78

%

air humidity

5.5

m/s

WindNE

27

mm of precipitation

(2% of annual average)

+30

°C

Water temperature

air humidity 78%; 27 millimeters of precipitation (2% of annual average); Wind north-easterly 5.5 Meters per second; Water temperature +30°

Weather graphs for September

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

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

NE

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

Santa Luzia
Teresina
Castanhal
Bonito
Caxias
Codó
Paragominas
Jijoca de Jericoacoara

Cities with similar weather in September

Alanya
Phuket
Larnaca
Tel Aviv
Aqaba
Goa
Eylat
Male
Haifa

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

September in São Luís is the windiest, the sunniest, and the hottest month of the year. In September, the weather in São Luís is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, São Luís has 16 sunny, 9 rainy, and 5 partly cloudy days in September. The rains are usually light.

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