Apia weather in September
September in Apia: hot, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Apia · #281 of 604 destinations to visit in September · comfort 81/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Apia climate normals — September
| Daytime high | 29°C / 84°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 136 mm / 5.4 in | 🌧 rainy |
| Rainy days | 23 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 23°C / 73°F | |
| Sunshine | 10.8 h/day | |
| Daylight | 12 h | |
| Wind | 25 km/h / 16 mph | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Apia?
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Apia in September — FAQ
- Is September a good time to visit Apia?
- September in Apia: hot, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Apia on SeasonMap's comfort score (81/100).
- What is the weather like in Apia in September?
- In September, Apia averages a daily high of 29.1°C and a low of 25.2°C, with about 136 mm of rain over roughly 22.6 rainy days.
- What is the air quality in Apia in September?
- Apia has a mean US Air Quality Index of about 33 in September.