Honolulu weather in September
September in Honolulu: hot, dry, with clean air — an excellent time to visit.
#5 of 12 months in Honolulu · #94 of 604 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Honolulu climate normals — September
| Daytime high | 29°C / 83°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 13 mm / 0.5 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 21°C / 69°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12.3 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 31 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Honolulu?
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Honolulu in September — FAQ
- Is September a good time to visit Honolulu?
- September in Honolulu: hot, dry, with clean air — an excellent time to visit. It ranks #5 of 12 months for Honolulu on SeasonMap's comfort score (89/100).
- What is the weather like in Honolulu in September?
- In September, Honolulu averages a daily high of 28.6°C and a low of 24.9°C, with about 12.9 mm of rain over roughly 4.2 rainy days.
- What is the air quality in Honolulu in September?
- Honolulu has a mean US Air Quality Index of about 31 in September.