Rennell weather in September 2025

Expect daytime maximum temperatures of 86°F in Rennell, Solomon Islands in September and high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 14 days with some rainfall and typically 6.9 inches of rainfall in the month.

  • 86°F maximum daytime temperature in September in Rennell86
    86°F max day temperature
  • 6 hours of sunshine per day
  • 14 days with some rainfall in September in Rennell14
    14 days with some rainfall
  • 72°F minimum night-time temperature in September in Rennell72
    72°F 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
  • 6.9 inches monthly rainfall in September in Rennell6.9
    6.9 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Rennell11
    11+ (Extreme) UV index
  • 82°F sea temperature in September in Rennell82
    82°F 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)  |  Imperial (°F)

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How hot is it in Rennell in September?

Daytime temperatures usually reach 86°F in Rennell in September with high heat and humidity, falling to 72°F 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 82°F.

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 6.9 inches.

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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