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Hawaii weather in September 2025
Expect 30°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Hawaii in September. Check more long-term weather averages for Hawaii in September before you book your next holiday to Hawaii in 2025/2026.
- 30°C max day temperature
30 - 9 hours of sunshine per day
- 8 days with some rainfall
8 - 22°C min night temperature
22 - 12 hours of daylight per day
12 - High heat & humidity
H - 18 mm of monthly rainfall
18 - 11 (Extreme) UV index
11 - 27°C sea temperature
27
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The September weather guide for Hawaii (Honolulu, Oahu) 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.
Top Hawaii destinations
Below are average maximum temperatures at popular countries, regions and places in Hawaii in September. Select a holiday destination to see more weather parameters.
All Hawaii destinations
- Halawa Bay, Molokai
- Hana, Maui
- Hanalei, Kauai
- Hilo, Big Island
- Honolulu, Oahu
- Hulopoe Bay, Lanai
- Kaanapali, Maui
- Kahului, Maui
- Kailua, Big Island
- Kailua, Oahu
- Kalaupapa, Molokai
- Kapalua, Maui
- Lahaina, Maui
- Lihue, Kauai
- Papohaku Beach, Molokai
- Waimea Bay, Oahu
- Waimea, Big Island
Metric (°C / mm) | Imperial (°F / inches)
More about the USA
How hot is it in Hawaii in September?
Daytime temperatures usually reach 30°C in Honolulu, Oahu, Hawaii in September with high heat and humidity, falling to 22°C at night.
How sunny is it in Hawaii in September?
There are normally 9 hours of bright sunshine each day in Honolulu, Oahu, Hawaii in September - that's 74% of daylight hours.
How warm is the sea around Hawaii in September?
The average sea temperature around Honolulu, Oahu, Hawaii in September is 27°C.
Does it rain in Hawaii in September?
There are usually 8 days with some rain in Honolulu, Oahu, Hawaii in September and the average monthly rainfall is 18mm.
Hawaii September sunrise & sunset times
Browse the sunrise and sunset times for Hawaii in September 2025. Select a month to view Hawaii sunrise and sunset times for the next 12 months. The Hawaii sunrise and sunset times shown below are for Honolulu, Oahu.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 06:15 | 18:47 |
| Monday, 15th September 2025 | 06:19 | 18:34 |
| Tuesday, 30th September 2025 | 06:22 | 18:20 |
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