Hawaii weather in September
September is one of the best months to visit Hawaii: highs of 28°C (82°F) and about 50 mm (2.0 in) of rain on average. Nights average 25°C (77°F) and cloud cover 47% (NASA POWER, 2001–2025 averages). The sea averages 27°C (81°F). It is the 5th driest month of the year and the warmest. Compared with August, it is about as warm and about as wet; October brings highs of 27°C (81°F) and 73 mm (2.9 in) of rain.
Figures are long-term averages for Honolulu, the largest city in Hawaii. See below for other places.
Is September a good time to visit Hawaii?
best month Weather score 82/100.
Yes. September is one of the best months for weather in Hawaii.
Does it rain a lot in Hawaii in September?
No, it is usually dry: about 50 mm (2.0 in) falls in an average September. It is the 5th driest month of the year.
How warm is Hawaii in September?
Days average 28°C (82°F) and nights 25°C (77°F).
Hawaii weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 24°C (76°F) | 22°C (71°F) | 71 mm | 52% | 25°C (77°F) | fair |
| February | 24°C (75°F) | 21°C (70°F) | 82 mm | 57% | 25°C (77°F) | least pleasant |
| March | 24°C (76°F) | 21°C (71°F) | 94 mm | 61% | 25°C (76°F) | least pleasant |
| April | 25°C (77°F) | 22°C (72°F) | 54 mm | 58% | 25°C (76°F) | fair |
| May | 26°C (79°F) | 23°C (73°F) | 47 mm | 50% | 25°C (78°F) | best |
| June | 27°C (80°F) | 24°C (75°F) | 37 mm | 48% | 26°C (78°F) | best |
| July | 27°C (81°F) | 24°C (76°F) | 40 mm | 47% | 26°C (79°F) | best |
| August | 28°C (82°F) | 25°C (77°F) | 44 mm | 47% | 27°C (80°F) | best |
| September | 28°C (82°F) | 25°C (77°F) | 50 mm | 47% | 27°C (81°F) | best |
| October | 27°C (81°F) | 25°C (76°F) | 73 mm | 56% | 27°C (81°F) | fair |
| November | 26°C (79°F) | 24°C (74°F) | 86 mm | 58% | 26°C (79°F) | least pleasant |
| December | 25°C (77°F) | 23°C (73°F) | 93 mm | 54% | 26°C (78°F) | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months
Weather across Hawaii in September
Weather can differ a lot within Hawaii: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Honolulu | 28°C (82°F) | 25°C (77°F) | 50 mm | best |
| East Honolulu | 27°C (81°F) | 26°C (78°F) | 36 mm | fair |
| Pearl City | 28°C (82°F) | 25°C (77°F) | 50 mm | best |
| Waiau-Pacific Palisades | 28°C (82°F) | 25°C (77°F) | 50 mm | best |
| Makakilo / Kapolei / Honokai Hale | 28°C (82°F) | 25°C (77°F) | 50 mm | best |
| Kalihi-Palama | 28°C (82°F) | 25°C (77°F) | 50 mm | best |
| Aliamanu / Salt Lakes / Foster Village | 28°C (82°F) | 25°C (77°F) | 50 mm | best |
| Kailua | 27°C (81°F) | 26°C (78°F) | 36 mm | fair |
| Waipahu | 28°C (82°F) | 25°C (77°F) | 50 mm | best |
| ʻEwa Gentry-West Loch | 28°C (82°F) | 25°C (77°F) | 50 mm | best |