Rennell weather in September 2025

Expect 30°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Rennell in September. Check more long-term weather averages for Rennell in September before you book your next holiday to Solomon Islands in 2025/2026.

  • 30°C maximum daytime temperature in September in Rennell30
    30°C max day temperature
  • 6 hours of sunshine per day
  • 14 days with some rainfall in September in Rennell14
    14 days with some rainfall
  • 22°C minimum night-time temperature in September in Rennell22
    22°C min night temperature
  • 12 hours of daylight per day in September in Rennell12
    12 hours of daylight per day
  • High heat & humidity in September in RennellH
    High heat & humidity
  • 176 mm monthly rainfall in September in Rennell176
    176 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Rennell11
    11+ (Extreme) UV index
  • 28°C sea temperature in September in Rennell28
    28°C sea temperature

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The September weather guide for Solomon Islands (Rennell) 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 Rennell in September?

Daytime temperatures usually reach 30°C in Rennell in September with high heat and humidity, falling to 22°C at night.

How sunny is it in Rennell in September?

There are normally 6 hours of bright sunshine each day in Rennell in September - that's 53% of daylight hours.

How warm is the sea around Rennell in September?

The average sea temperature around Rennell in September is 28°C.

Does it rain in Rennell in September?

There are usually 14 days with some rain in Rennell in September and the average monthly rainfall is 176mm.

Rennell September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:23 18:16
Monday, 15th September 2025 06:14 18:16
Tuesday, 30th September 2025 06:04 18:15

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