Kona weather in September
September in Kona: hot, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Kona · #137 of 604 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Kona climate normals — September
| Daytime high | 26°C / 78°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 71°F | |
| Feels like (high) | 31°C / 88°F | |
| Rainfall | 68 mm / 2.7 in | 🌦 some rain |
| Rainy days | 14 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 21°C / 69°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12.2 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 17 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Kona in September — FAQ
- Is September a good time to visit Kona?
- September in Kona: hot, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Kona on SeasonMap's comfort score (87/100).
- What is the weather like in Kona in September?
- In September, Kona averages a daily high of 25.7°C and a low of 21.4°C, with about 68.2 mm of rain over roughly 14 rainy days.
- What is the air quality in Kona in September?
- Kona has a mean US Air Quality Index of about 17 in September.