Alotau weather in September 2025

Expect 29°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Alotau in September. Check more long-term weather averages for Alotau in September before you book your next holiday to Papua New Guinea in 2025/2026.

  • 29°C maximum daytime temperature in September in Alotau29
    29°C max day temperature
  • 7 hours of sunshine per day
  • 14 days with some rainfall in September in Alotau14
    14 days with some rainfall
  • 22°C minimum night-time temperature in September in Alotau22
    22°C min night temperature
  • 12 hours of daylight per day in September in Alotau12
    12 hours of daylight per day
  • Moderate heat & humidity in September in AlotauM
    Moderate heat & humidity
  • 237 mm monthly rainfall in September in Alotau237
    237 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Alotau11
    11+ (Extreme) UV index
  • 26°C sea temperature in September in Alotau26
    26°C sea temperature

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The September weather guide for Papua New Guinea (Alotau) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Alotau in September?

Daytime temperatures usually reach 29°C in Alotau in September with moderate heat and humidity, falling to 22°C at night.

How sunny is it in Alotau in September?

There are normally 7 hours of bright sunshine each day in Alotau in September - that's 54% of daylight hours.

How warm is the sea around Alotau in September?

The average sea temperature around Alotau in September is 26°C.

Does it rain in Alotau in September?

There are usually 14 days with some rain in Alotau in September and the average monthly rainfall is 237mm.

Alotau September sunrise & sunset times

Browse the sunrise and sunset times for Alotau in September 2025. Select a month to view Alotau sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:01 17:56
Monday, 15th September 2025 05:52 17:55
Tuesday, 30th September 2025 05:43 17:54

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