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September weather forecast in Negombo

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		86%
	6.3 m/s		+28

31 August, Sunday. day, 28°; night, 25°; rain

1 September, mon

	757 mmHg		86%
	6.1 m/s		+28

1 September, Monday. day, 28°; night, 25°; rain

2 September, tue

	757 mmHg		86%
	6.1 m/s		+28

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

3 September, wed

	757 mmHg		86%
	6.2 m/s		+28

3 September, Wednesday. day, 28°; night, 25°; rain

4 September, thu

	757 mmHg		86%
	6.3 m/s		+28

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

5 September, fri

	757 mmHg		86%
	6.4 m/s		+28

5 September, Friday. day, 28°; night, 25°; rain

6 September, sat

	757 mmHg		85%
	6.6 m/s		+28

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

7 September, sun

	757 mmHg		85%
	6.2 m/s		+28

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

8 September, mon

	758 mmHg		85%
	6.2 m/s		+28

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

9 September, tue

	758 mmHg		85%
	6.3 m/s		+28

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

10 September, wed

	757 mmHg		86%
	6.4 m/s		+28

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

11 September, thu

	757 mmHg		85%
	6.4 m/s		+28

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

12 September, fri

	757 mmHg		85%
	6.2 m/s		+28

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

13 September, sat

	758 mmHg		85%
	6.1 m/s		+28

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

14 September, sun

	758 mmHg		85%
	6.3 m/s		+28

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

15 September, mon

	757 mmHg		85%
	6.4 m/s		+28

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

16 September, tue

	757 mmHg		85%
	6.3 m/s		+28

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

17 September, wed

	757 mmHg		86%
	6.4 m/s		+28

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

18 September, thu

	758 mmHg		85%
	6.5 m/s		+28

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

19 September, fri

	757 mmHg		85%
	6.5 m/s		+28

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

20 September, sat

	757 mmHg		85%
	6.4 m/s		+28

20 September, Saturday. day, 28°; night, 25°; rain

21 September, sun

	757 mmHg		86%
	6.3 m/s		+28

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

22 September, mon

	757 mmHg		86%
	6.1 m/s		+28

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

23 September, tue

	757 mmHg		85%
	6 m/s		+28

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

24 September, wed

	757 mmHg		86%
	5.9 m/s		+28

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

25 September, thu

	757 mmHg		85%
	6 m/s		+28

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

26 September, fri

	757 mmHg		85%
	5.9 m/s		+28

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

27 September, sat

	757 mmHg		85%
	5.8 m/s		+28

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

28 September, sun

	757 mmHg		85%
	5.9 m/s		+28

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

29 September, mon

	757 mmHg		85%
	5.7 m/s		+28

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

30 September, tue

	757 mmHg		85%
	5.7 m/s		+28

30 September, Tuesday. day, 28°; night, 25°; rain

1 October, wed

	757 mmHg		85%
	5.7 m/s		+28

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

2 October, thu

	758 mmHg		85%
	5.7 m/s		+28

2 October, Thursday. day, 28°; night, 25°; rain

3 October, fri

	758 mmHg		85%
	5.8 m/s		+28

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

4 October, sat

	758 mmHg		84%
	5.7 m/s		+28

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

Average data for 10 years

Negombo September

0

sunny days

29

days with precipitation

16

cloudy days

0 sunny days; 29 days with precipitation; 16 cloudy days;

85

%

air humidity

5.1

m/s

WindSW

242

mm of precipitation

(11% of annual average)

+28

°C

Water temperature

air humidity 85%; 242 millimeters of precipitation (11% of annual average); Wind south-westerly 5.1 Meters per second; Water temperature +28°

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

Unawatuna
Colombo
Hikkaduwa
Sri Jayawardenapura Kotte
Bentota
Galle
Tangalle
Pasikudah
Kalutara

Cities with similar weather in September

Tel Aviv
Jerba
Aqaba
Goa
Eylat
Male
Haifa
Zanzibar
Netanya

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

In September, the weather in Negombo is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Negombo has 29 rainy and 1 cloudy day in September. The rains are usually heavy. September as well as March, April, May, and June is considered the most uncomfortable time to visit Negombo.

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