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September weather forecast in São Tomé

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

	760 mmHg		83%
	7 m/s		+26

31 August, Sunday. day, 24°; night, 24°; rain

1 September, mon

	760 mmHg		83%
	6.7 m/s		+26

1 September, Monday. day, 24°; night, 24°; partly cloudy

2 September, tue

	760 mmHg		82%
	6.6 m/s		+26

2 September, Tuesday. day, 25°; night, 24°; partly cloudy

3 September, wed

	760 mmHg		82%
	6.4 m/s		+26

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

4 September, thu

	760 mmHg		83%
	7 m/s		+26

4 September, Thursday. day, 25°; night, 24°; partly cloudy

5 September, fri

	760 mmHg		83%
	6.9 m/s		+26

5 September, Friday. day, 25°; night, 24°; partly cloudy

6 September, sat

	760 mmHg		83%
	6.4 m/s		+26

6 September, Saturday. day, 25°; night, 24°; partly cloudy

7 September, sun

	760 mmHg		83%
	6.6 m/s		+26

7 September, Sunday. day, 25°; night, 24°; overcast

8 September, mon

	760 mmHg		83%
	6.6 m/s		+26

8 September, Monday. day, 25°; night, 24°; overcast

9 September, tue

	760 mmHg		83%
	6.7 m/s		+26

9 September, Tuesday. day, 25°; night, 24°; partly cloudy

10 September, wed

	760 mmHg		83%
	6.4 m/s		+26

10 September, Wednesday. day, 25°; night, 24°; overcast

11 September, thu

	760 mmHg		83%
	6.6 m/s		+26

11 September, Thursday. day, 25°; night, 24°; partly cloudy

12 September, fri

	760 mmHg		83%
	6.9 m/s		+26

12 September, Friday. day, 25°; night, 24°; partly cloudy

13 September, sat

	760 mmHg		83%
	6.7 m/s		+26

13 September, Saturday. day, 25°; night, 24°; partly cloudy

14 September, sun

	760 mmHg		83%
	6.4 m/s		+26

14 September, Sunday. day, 25°; night, 24°; partly cloudy

15 September, mon

	760 mmHg		83%
	6.6 m/s		+26

15 September, Monday. day, 25°; night, 24°; clear

16 September, tue

	760 mmHg		83%
	6.4 m/s		+26

16 September, Tuesday. day, 25°; night, 24°; overcast

17 September, wed

	760 mmHg		84%
	6.7 m/s		+26

17 September, Wednesday. day, 25°; night, 24°; rain

18 September, thu

	760 mmHg		83%
	6.9 m/s		+26

18 September, Thursday. day, 25°; night, 24°; rain

19 September, fri

	760 mmHg		83%
	6.7 m/s		+26

19 September, Friday. day, 25°; night, 24°; rain

20 September, sat

	760 mmHg		83%
	6.4 m/s		+26

20 September, Saturday. day, 25°; night, 24°; rain

21 September, sun

	760 mmHg		84%
	6.4 m/s		+26

21 September, Sunday. day, 25°; night, 24°; partly cloudy

22 September, mon

	760 mmHg		84%
	6.5 m/s		+26

22 September, Monday. day, 25°; night, 24°; rain

23 September, tue

	760 mmHg		84%
	6.4 m/s		+26

23 September, Tuesday. day, 25°; night, 24°; rain

24 September, wed

	760 mmHg		84%
	6.3 m/s		+26

24 September, Wednesday. day, 25°; night, 24°; rain

25 September, thu

	760 mmHg		84%
	6.1 m/s		+27

25 September, Thursday. day, 25°; night, 24°; rain

26 September, fri

	760 mmHg		84%
	6.3 m/s		+27

26 September, Friday. day, 25°; night, 24°; rain

27 September, sat

	759 mmHg		84%
	6.3 m/s		+27

27 September, Saturday. day, 25°; night, 24°; rain

28 September, sun

	759 mmHg		84%
	6.4 m/s		+27

28 September, Sunday. day, 25°; night, 24°; rain

29 September, mon

	760 mmHg		83%
	6.4 m/s		+27

29 September, Monday. day, 25°; night, 24°; rain

30 September, tue

	759 mmHg		83%
	6.2 m/s		+27

30 September, Tuesday. day, 25°; night, 25°; rain

1 October, wed

	759 mmHg		83%
	6.4 m/s		+27

1 October, Wednesday. day, 25°; night, 25°; partly cloudy

2 October, thu

	759 mmHg		84%
	6.1 m/s		+27

2 October, Thursday. day, 25°; night, 25°; partly cloudy

3 October, fri

	759 mmHg		83%
	6.2 m/s		+27

3 October, Friday. day, 25°; night, 25°; rain

4 October, sat

	759 mmHg		84%
	6.2 m/s		+27

4 October, Saturday. day, 25°; night, 25°; partly cloudy

Average data for 10 years

São Tomé September

1

sunny day

13

days with precipitation

12

cloudy days

1 sunny day; 13 days with precipitation; 12 cloudy days;

83

%

air humidity

5.5

m/s

WindSW

58

mm of precipitation

(5% of annual average)

+26

°C

Water temperature

air humidity 83%; 58 millimeters of precipitation (5% of annual average); Wind south-westerly 5.5 Meters per second; Water temperature +26°

Weather graphs for September

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

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

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

Libreville
Malabo
Bata
Calabar
Buguma
Yaoundé
Aba
Douala
Kumba

Cities with similar weather in September

Jerba
Limassol
Rhodes
Aqaba
Eylat
Sousse
Monastir
Zanzibar
Denpasar

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

In September, the weather in São Tomé is typically warm. Average daily high temperature in September is about 25 degrees above zero. On average, São Tomé has 13 rainy, 12 partly cloudy, 4 cloudy, and 1 sunny day in September. The rains are usually heavy.

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