Honiara weather in September
September in Honiara: sweltering, soaked, with clean air — a great time to visit.
#6 of 12 months in Honiara · #421 of 604 destinations to visit in September · comfort 70/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Honiara climate normals — September
| Daytime high | 29°C / 84°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 78°F | |
| Feels like (high) | 35°C / 95°F | |
| Rainfall | 288 mm / 11.3 in | ⛈ soaked |
| Rainy days | 26 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12.1 h | |
| Wind | 17 km/h / 10 mph | |
| Air quality (US AQI) | 17 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Honiara?
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Honiara in September — FAQ
- Is September a good time to visit Honiara?
- September in Honiara: sweltering, soaked, with clean air — a great time to visit. It ranks #6 of 12 months for Honiara on SeasonMap's comfort score (70/100).
- What is the weather like in Honiara in September?
- In September, Honiara averages a daily high of 28.8°C and a low of 25.4°C, with about 287.5 mm of rain over roughly 26.4 rainy days.
- What is the air quality in Honiara in September?
- Honiara has a mean US Air Quality Index of about 17 in September.