Nelson weather in September
September in Nelson: cool, rainy, with clean air — a great time to visit.
#8 of 12 months in Nelson · #571 of 897 destinations to visit in September · comfort 77/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Nelson in September
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Nelson climate normals — September
| Daytime high | 15°C / 58°F | 🙂 cool |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Rainfall | 118 mm / 4.7 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 8°C / 46°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 11.8 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 23 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Nelson in September — FAQ
- Is September a good time to visit Nelson?
- September in Nelson: cool, rainy, with clean air — a great time to visit. It ranks #8 of 12 months for Nelson on SeasonMap's comfort score (77/100).
- What is the weather like in Nelson in September?
- In September, Nelson averages a daily high of 14.5°C and a low of 7.5°C, with about 118.2 mm of rain over roughly 13.2 rainy days.
- What is the air quality in Nelson in September?
- Nelson has a mean US Air Quality Index of about 23 in September.