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September weather forecast in Koumac

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

	759 mmHg		71%
	5.4 m/s		+24

31 August, Sunday. day, 24°; night, 19°; partly cloudy

1 September, mon

	759 mmHg		73%
	4.8 m/s		+25

1 September, Monday. day, 24°; night, 19°; partly cloudy

2 September, tue

	759 mmHg		72%
	4.9 m/s		+24

2 September, Tuesday. day, 24°; night, 19°; clear

3 September, wed

	759 mmHg		72%
	5.3 m/s		+25

3 September, Wednesday. day, 24°; night, 19°; partly cloudy

4 September, thu

	759 mmHg		72%
	5 m/s		+25

4 September, Thursday. day, 24°; night, 19°; clear

5 September, fri

	759 mmHg		72%
	4.8 m/s		+25

5 September, Friday. day, 24°; night, 19°; clear

6 September, sat

	759 mmHg		74%
	4.69 m/s		+25

6 September, Saturday. day, 24°; night, 19°; partly cloudy

7 September, sun

	759 mmHg		72%
	5.1 m/s		+25

7 September, Sunday. day, 24°; night, 19°; clear

8 September, mon

	759 mmHg		71%
	5 m/s		+24

8 September, Monday. day, 24°; night, 19°; clear

9 September, tue

	759 mmHg		72%
	4.9 m/s		+25

9 September, Tuesday. day, 24°; night, 19°; clear

10 September, wed

	759 mmHg		72%
	4.9 m/s		+25

10 September, Wednesday. day, 24°; night, 19°; partly cloudy

11 September, thu

	759 mmHg		72%
	5 m/s		+24

11 September, Thursday. day, 24°; night, 19°; rain

12 September, fri

	759 mmHg		74%
	5.2 m/s		+24

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

13 September, sat

	759 mmHg		72%
	5 m/s		+25

13 September, Saturday. day, 24°; night, 19°; clear

14 September, sun

	759 mmHg		74%
	5.5 m/s		+26

14 September, Sunday. day, 25°; night, 19°; clear

15 September, mon

	759 mmHg		74%
	5.3 m/s		+26

15 September, Monday. day, 25°; night, 19°; clear

16 September, tue

	759 mmHg		73%
	5.2 m/s		+27

16 September, Tuesday. day, 25°; night, 20°; rain

17 September, wed

	759 mmHg		72%
	5.2 m/s		+26

17 September, Wednesday. day, 25°; night, 20°; clear

18 September, thu

	759 mmHg		73%
	5 m/s		+26

18 September, Thursday. day, 25°; night, 20°; clear

19 September, fri

	759 mmHg		70%
	4.9 m/s		+25

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

20 September, sat

	759 mmHg		71%
	4.8 m/s		+26

20 September, Saturday. day, 25°; night, 19°; clear

21 September, sun

	759 mmHg		72%
	4.69 m/s		+26

21 September, Sunday. day, 25°; night, 20°; overcast

22 September, mon

	759 mmHg		72%
	5 m/s		+25

22 September, Monday. day, 25°; night, 19°; rain

23 September, tue

	759 mmHg		72%
	4.69 m/s		+26

23 September, Tuesday. day, 25°; night, 19°; rain

24 September, wed

	759 mmHg		71%
	4.9 m/s		+27

24 September, Wednesday. day, 25°; night, 20°; clear

25 September, thu

	759 mmHg		71%
	4.69 m/s		+26

25 September, Thursday. day, 25°; night, 19°; clear

26 September, fri

	759 mmHg		72%
	4.4 m/s		+27

26 September, Friday. day, 25°; night, 20°; partly cloudy

27 September, sat

	758 mmHg		72%
	4.69 m/s		+26

27 September, Saturday. day, 25°; night, 20°; clear

28 September, sun

	758 mmHg		71%
	4.69 m/s		+27

28 September, Sunday. day, 25°; night, 20°; partly cloudy

29 September, mon

	759 mmHg		72%
	4.9 m/s		+28

29 September, Monday. day, 25°; night, 20°; clear

30 September, tue

	759 mmHg		73%
	5 m/s		+27

30 September, Tuesday. day, 25°; night, 20°; partly cloudy

1 October, wed

	759 mmHg		72%
	5.2 m/s		+27

1 October, Wednesday. day, 26°; night, 20°; clear

2 October, thu

	759 mmHg		71%
	5.5 m/s		+26

2 October, Thursday. day, 26°; night, 20°; clear

3 October, fri

	758 mmHg		70%
	5.4 m/s		+26

3 October, Friday. day, 25°; night, 20°; clear

4 October, sat

	758 mmHg		70%
	5.1 m/s		+26

4 October, Saturday. day, 26°; night, 20°; clear

Average data for 10 years

Koumac September

17

sunny days

5

days with precipitation

3

cloudy days

17 sunny days; 5 days with precipitation; 3 cloudy days;

72

%

air humidity

3.5

m/s

WindSE

39

mm of precipitation

(4% of annual average)

+26

°C

Water temperature

air humidity 72%; 39 millimeters of precipitation (4% of annual average); Wind south-easterly 3.5 Meters per second; Water temperature +26°

Weather graphs for September

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

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Average data for 10 years

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Daytime temperature

Night-time temperature

Cities near you

Port Vila
Kingston
Bargara
Auki
Honiara
Yandina
Norsup
Noumea
We

Cities with similar weather in September

Batumi
Lisbon
Heraklion
Nice
Hersonisos
Kobuleti
Kos
Santa Cruz de Tenerife
Funchal

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

In September, the weather in Koumac is typically warm. Average daily high temperature in September is about 25 degrees above zero. On average, Koumac has 17 sunny, 7 partly cloudy, 5 rainy, and 1 cloudy day in September. The rains are usually light. September as well as June, July, and August is considered the most comfortable time to visit Koumac.

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