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Alotau in September 2026: weather, temperatures and activities

Do you want to visit Alotau in September 2026? Discover the usual weather at this time of year, average temperatures, the risk of rain, possible activities, and our opinion on whether September is a good month to travel to Alotau, Papua New Guinea.

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Is it worth visiting Alotau in September?

Check your ideal travel criteria and see if the month of September suits your plans to go to Alotau.
What matters most?
Alotau in September 2026: weather, temperatures and activities

Page summary

Alotau in September in summary
Favourable weather
Min 24°C Max 27°C 185 mm 9 day(s) 85% 44% 27°C UV 6 9.8 h/day
Best activities in September
Animal observationNature and landscapes
Practical guidelines
Very large crowds 05:53 17:55
Hourly weather

Average weather in Alotau in September 2026

Favourable weather

The weather in Alotau in September 2026 is based on statistical data from previous years in September. This allows you to forecast the weather in September 2026. Check the hourly statistics (6:00, 9:00, 12:00, 15:00, 18:00, 21:00, 0:00 and 3:00), with the associated average temperature, for the whole month, and also, by navigating the tabs, for the beginning, middle and end of the month.

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Climate

Climate of Alotau in September

Temperatures, precipitation and monthly trends help to better understand the climate in Alotau in September.

Temperatures and rain in Alotau in September

Average daily weather

Temperatures and rain day by day in September.
Minimal Average Maximums Average rainfall

Monthly temperatures

The month of September is highlighted to compare it quickly with the rest of the year.
Minimal Average Maximums

Monthly precipitation

The bar for the month under study is highlighted.
Average rainfall

About the climate in Alotau in September

Seasonal normals

Seasonal normals of Alotau in September

Check the seasonal normals in Alotau in September and compare the weather with the previous month and the following month (or the months of your choice by selecting months in the form below): temperatures, wind, rain, humidity, climate rating...

Last updated: 12/01/2026
Reference period for normals: January 2009 - December 2025
Month analyzed
September
Weather data August September October
Outside temperature
Average temperature 25.2°C 25.7°C 26.6°C
Maximum temperature 26.4°C 26.9°C 27.9°C
Minimum temperature 23.9°C 24.5°C 25.2°C
Record maximum temperature 29.0°C
(2014)
30.0°C
(2021)
30.0°C
(2009)
Record low temperature 19.0°C
(2011)
20.0°C
(2021)
21.0°C
(2014)
Number of days at +30° 0 day(s)
(0%)
0 day(s)
(0%)
2 day(s)
(6%)
Number of days at +18° 31 day(s)
(100%)
30 day(s)
(100%)
31 day(s)
(100%)
Number of days below 0° 0 day(s)
(0%)
0 day(s)
(0%)
0 day(s)
(0%)
Sea temperature
Sea temperature (average) 26.0°C 26.0°C 27.3°C
Sea temperature (minimum) 25.3°C 25.0°C 25.6°C
Sea temperature (maximum) 26.8°C 27.3°C 28.8°C
Wind
Wind speed 15 km/h 15 km/h 14 km/h
Wind temperature 24.0°C 24.5°C 25.2°C
Precipitation (rain)
Precipitation 153.0 mm 185.3 mm 203.2 mm
Number of days with precipitation 19 day(s)
(61%)
20 day(s)
(67%)
20 day(s)
(65%)
Number of days with significant precipitation (greater than 5 mm) 8 day(s)
(26%)
9 day(s)
(31%)
10 day(s)
(33%)
Record precipitation in one day 92.5 mm
(2009)
150.8 mm
(2011)
66.2 mm
(2013)
Other weather data
Humidity 85% 85% 83%
Visibility 9.5 km 9.5 km 9.4 km
Cloud cover 42% 44% 36%
UV index 6 6 7
Daily sunshine 8h 10h 11h
Sunrise and sunset
Sunrise time 06h10 05h53 05h35
Sunset time 17h56 17h55 17h54
Day length 11h46 12h02 12h19
Our opinion on the climate in September
The review of Where And When favourable weather favourable weather favourable weather
Activities and events

What to do in Alotau in September?

Best activities in September
Animal observationNature and landscapes
Possible activities in September
Beach and swimmingDiving and snorkelingWatersportsBoat trip and cruise
Observed weather

What was the weather like in Alotau in September last?

Find the observed weather calendar in Alotau in September 2025, with each day’s weather, temperatures and precipitation.

Mon. Tue. Wed. Thu. Fri. Sat. Sun.
1
Patchy rain nearby
21°C25°C0.8 mm
2
Patchy rain nearby
23°C26°C1.2 mm
3
Patchy rain nearby
23°C28°C0.5 mm
4
Patchy rain nearby
24°C26°C0.8 mm
5
Patchy rain nearby
25°C28°C0.3 mm
6
Patchy rain nearby
25°C28°C2.4 mm
7
Patchy rain nearby
25°C28°C1.6 mm
8
Patchy rain nearby
24°C26°C1.0 mm
9
Patchy rain nearby
22°C26°C0.0 mm
10
Patchy rain nearby
24°C27°C0.6 mm
11
Light rain shower
22°C25°C4.9 mm
12
Light rain shower
24°C26°C3.3 mm
13
Light rain shower
24°C28°C1.5 mm
14
Light rain shower
25°C26°C4.5 mm
15
Cloudy
23°C26°C0.6 mm
16
Clear/Sunny
24°C27°C0.0 mm
17
Patchy rain nearby
25°C29°C0.0 mm
18
Light rain shower
25°C28°C3.6 mm
19
Patchy rain nearby
25°C28°C4.5 mm
20
Patchy light drizzle
25°C27°C0.8 mm
21
Patchy rain nearby
24°C27°C0.3 mm
22
Light rain shower
24°C27°C12.9 mm
23
Light rain shower
25°C26°C3.3 mm
24
Light rain shower
25°C26°C6.1 mm
25
Light rain shower
25°C26°C4.7 mm
26
Light rain shower
25°C27°C6.5 mm
27
Patchy rain nearby
25°C27°C0.9 mm
28
Clear/Sunny
25°C29°C0.1 mm
29
Patchy rain nearby
25°C28°C0.3 mm
30
Clear/Sunny
25°C28°C0.0 mm
Nearby

Where to go near Alotau in September?

Compare cities and destinations near Alotau in September to find another travel stop, a nearby alternative or a logical continuation of your stay in Alotau.

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Every month

Best time to visit Alotau month by month

Compare the weather in Alotau across all months of the year and open each detailed page to find the best time.

Frequently asked questions

Travel to to Alotau in September: your frequently asked questions

Short answers to the questions we ask ourselves before booking for this month.

Yes, it’s a good time. Conditions are favorable in Alotau in September, which places this month 5th out of 12.

Expect an average of 27°C during the day and 24°C at night, with about 185 mm of precipitation spread over 9 rainy days.

Yes: the sea is 26°C on average in September, a pleasant temperature for swimming.

Expect about 9.8 hours of sunshine per day on average for this month.

This month is particularly suited to these activities: Animal observation and Nature and landscapes. These are the ones for which the conditions on site are most favourable.

Yes: this month is in Very large crowds, with a visitor index of 82/100. Book your accommodation and transportation well in advance.

The most favorable months in Alotau are: April, June, July, August, September, October, November and December. You are therefore already in one of the best times of the year; shifting your plans would not gain you much in terms of weather.
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