Fort William weather in September
September in Fort William: cool, rainy, with clean air — a great time to visit.
#6 of 12 months in Fort William · #537 of 897 destinations to visit in September · comfort 79/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Fort William in September
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Fort William climate normals — September
| Daytime high | 16°C / 60°F | 🙂 cool |
|---|---|---|
| Nighttime low | 10°C / 51°F | |
| Rainfall | 150 mm / 5.9 in | 🌧 rainy |
| Rainy days | 17 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 5.8 h/day | |
| Daylight | 12.8 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 28 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Fort William in September — FAQ
- Is September a good time to visit Fort William?
- September in Fort William: cool, rainy, with clean air — a great time to visit. It ranks #6 of 12 months for Fort William on SeasonMap's comfort score (79/100).
- What is the weather like in Fort William in September?
- In September, Fort William averages a daily high of 15.7°C and a low of 10.3°C, with about 149.7 mm of rain over roughly 17.2 rainy days.
- What is the air quality in Fort William in September?
- Fort William has a mean US Air Quality Index of about 28 in September.