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Kailua, Big Island weather in September 2025
Expect 23°C daytime maximum temperatures in the shade with on average -9999 hours of sunshine per day in Kailua, Big Island in September. Check more long-term weather averages for Kailua, Big Island in September before you book your next holiday to Hawaii in 2025/2026.
- 2323°C max day temperature
- 1515 days with some rainfall
- 1515°C min night temperature
- 1212 hours of daylight per day
- MModerate heat & humidity
- 5454 mm of monthly rainfall
- 1111+ (Extreme) UV index
- 2727°C sea temperature
More about Kailua, Big Island
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Recommended for Hawaii
The September weather guide for Hawaii (Kailua, Big Island) 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)
More about the USA
How hot is it in Kailua, Big Island in September?
Daytime temperatures usually reach 23°C in Kailua, Big Island in September, falling to 15°C at night.
How warm is the sea around Kailua, Big Island in September?
The average sea temperature around Kailua, Big Island in September is 27°C.
Does it rain in Kailua, Big Island in September?
There are usually 15 days with some rain in Kailua, Big Island in September and the average monthly rainfall is 54mm.
Kailua, Big Island September sunrise & sunset times
Browse the sunrise and sunset times for Kailua, Big Island in September 2025. Select a month to view Kailua, Big Island sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 06:09 | 18:39 |
Monday, 15th September 2025 | 06:12 | 18:26 |
Tuesday, 30th September 2025 | 06:15 | 18:12 |
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