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Hilo, Big Island weather in September 2026
Expect daytime maximum temperatures of 75°F in Hilo, Big Island, Hawaii in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 14 days with some rainfall and typically 9.9 inches of rainfall in the month.
- 75°F max day temperature
75 - 5 hours of sunshine per day
- 14 days with some rainfall
14 - 61°F min night temperature
61 - 12 hours of daylight per day
12 - Moderate heat & humidity
M - 9.9 inches of monthly rainfall
9.9 - 11+ (Extreme) UV index
11 - 81°F sea temperature
81
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The September weather guide for Hawaii (Hilo, 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) | Imperial (°F)
More about the USA
How hot is it in Hilo, Big Island in September?
Daytime temperatures usually reach 86°F in Hilo, Big Island in September with high heat and humidity, falling to 72°F at night.
How sunny is it in Hilo, Big Island in September?
There are normally 9 hours of bright sunshine each day in Hilo, Big Island in September - that's 74% of daylight hours.
How warm is the sea around Hilo, Big Island in September?
The average sea temperature around Hilo, Big Island in September is 81°F.
Does it rain in Hilo, Big Island in September?
There are usually 8 days with some rain in Hilo, Big Island in September and the average monthly rainfall is 0.7 inches.
Hilo, Big Island September sunrise & sunset times
Browse the sunrise and sunset times for Hilo, Big Island in September 2026. Select a month to view Hilo, Big Island sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Tuesday, 1st September 2026 | 06:05 | 18:35 |
| Tuesday, 15th September 2026 | 06:08 | 18:23 |
| Wednesday, 30th September 2026 | 06:11 | 18:09 |
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