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September weather forecast in Alotau

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

	731 mmHg		88%
	2.7 m/s		+26

31 August, Sunday. day, 26°; night, 21°; rain

1 September, mon

	732 mmHg		88%
	2.8 m/s		+26

1 September, Monday. day, 26°; night, 20°; rain

2 September, tue

	732 mmHg		88%
	2.8 m/s		+26

2 September, Tuesday. day, 26°; night, 20°; rain

3 September, wed

	732 mmHg		86%
	3 m/s		+26

3 September, Wednesday. day, 26°; night, 20°; clear

4 September, thu

	731 mmHg		86%
	2.9 m/s		+26

4 September, Thursday. day, 26°; night, 20°; partly cloudy

5 September, fri

	731 mmHg		86%
	2.8 m/s		+26

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

6 September, sat

	732 mmHg		87%
	2.7 m/s		+26

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

7 September, sun

	732 mmHg		86%
	2.9 m/s		+26

7 September, Sunday. day, 26°; night, 20°; partly cloudy

8 September, mon

	732 mmHg		85%
	2.9 m/s		+26

8 September, Monday. day, 26°; night, 20°; partly cloudy

9 September, tue

	731 mmHg		85%
	3 m/s		+26

9 September, Tuesday. day, 26°; night, 20°; partly cloudy

10 September, wed

	731 mmHg		85%
	3 m/s		+26

10 September, Wednesday. day, 26°; night, 21°; overcast

11 September, thu

	731 mmHg		86%
	3 m/s		+26

11 September, Thursday. day, 26°; night, 20°; rain

12 September, fri

	732 mmHg		86%
	3 m/s		+26

12 September, Friday. day, 26°; night, 20°; rain

13 September, sat

	732 mmHg		87%
	2.9 m/s		+26

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

14 September, sun

	732 mmHg		88%
	3 m/s		+26

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

15 September, mon

	731 mmHg		87%
	2.9 m/s		+26

15 September, Monday. day, 26°; night, 21°; rain

16 September, tue

	732 mmHg		88%
	2.9 m/s		+26

16 September, Tuesday. day, 26°; night, 21°; rain

17 September, wed

	732 mmHg		89%
	2.8 m/s		+26

17 September, Wednesday. day, 26°; night, 21°; rain

18 September, thu

	732 mmHg		89%
	2.8 m/s		+26

18 September, Thursday. day, 26°; night, 21°; rain

19 September, fri

	731 mmHg		88%
	2.8 m/s		+27

19 September, Friday. day, 26°; night, 21°; rain

20 September, sat

	731 mmHg		87%
	2.8 m/s		+27

20 September, Saturday. day, 27°; night, 21°; rain

21 September, sun

	731 mmHg		89%
	2.6 m/s		+27

21 September, Sunday. day, 27°; night, 21°; rain

22 September, mon

	731 mmHg		89%
	2.6 m/s		+26

22 September, Monday. day, 26°; night, 21°; rain

23 September, tue

	731 mmHg		88%
	2.5 m/s		+27

23 September, Tuesday. day, 27°; night, 21°; rain

24 September, wed

	731 mmHg		88%
	2.6 m/s		+26

24 September, Wednesday. day, 27°; night, 21°; rain

25 September, thu

	731 mmHg		88%
	2.5 m/s		+27

25 September, Thursday. day, 26°; night, 21°; rain

26 September, fri

	731 mmHg		89%
	2.7 m/s		+27

26 September, Friday. day, 27°; night, 21°; rain

27 September, sat

	731 mmHg		89%
	2.6 m/s		+27

27 September, Saturday. day, 27°; night, 21°; rain

28 September, sun

	731 mmHg		87%
	2.7 m/s		+27

28 September, Sunday. day, 27°; night, 21°; rain

29 September, mon

	731 mmHg		87%
	2.7 m/s		+27

29 September, Monday. day, 27°; night, 21°; rain

30 September, tue

	731 mmHg		89%
	2.6 m/s		+27

30 September, Tuesday. day, 27°; night, 21°; rain

1 October, wed

	731 mmHg		90%
	2.6 m/s		+27

1 October, Wednesday. day, 26°; night, 21°; rain

2 October, thu

	731 mmHg		90%
	2.6 m/s		+27

2 October, Thursday. day, 27°; night, 21°; rain

3 October, fri

	731 mmHg		89%
	2.5 m/s		+27

3 October, Friday. day, 27°; night, 21°; rain

4 October, sat

	731 mmHg		88%
	2.6 m/s		+27

4 October, Saturday. day, 27°; night, 21°; rain

Average data for 10 years

Alotau September

1

sunny day

23

days with precipitation

18

cloudy days

1 sunny day; 23 days with precipitation; 18 cloudy days;

87

%

air humidity

1.8

m/s

WindSE

229

mm of precipitation

(7% of annual average)

+26

°C

Water temperature

air humidity 87%; 229 millimeters of precipitation (7% of annual average); Wind south-easterly 1.8 Meters per second; Water temperature +26°

Weather graphs for September

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

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1

Average data for 10 years

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Daytime temperature

Night-time temperature

Cities near you

Port Moresby
Goroka
Munda
Mount-Hagen
Gurney Airport
Salamo
Tufi
Hoskins
Lae

Cities with similar weather in September

Jerba
Rhodes
Aqaba
Eylat
Monastir
Zanzibar
Denpasar
Alexandria
Agadir

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

In September, the weather in Alotau is typically warm. Average daily high temperature in September is about 26 degrees above zero. On average, Alotau has 23 rainy, 5 partly cloudy, 1 sunny, and 1 cloudy day in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Alotau.

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