Yellowknife weather in September
September in Yellowknife: cool, dry — a great time to visit.
#4 of 12 months in Yellowknife · #548 of 897 destinations to visit in September · comfort 79/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Yellowknife in September
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Yellowknife climate normals — September
| Daytime high | 13°C / 56°F | 🙂 cool |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Rainfall | 25 mm / 1 in | ☀️ dry |
| Rainy days | 5 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 7°C / 45°F | |
| Sunshine | 8 h/day | |
| Daylight | 12.9 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 65 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Yellowknife in September — FAQ
- Is September a good time to visit Yellowknife?
- September in Yellowknife: cool, dry — a great time to visit. It ranks #4 of 12 months for Yellowknife on SeasonMap's comfort score (79/100).
- What is the weather like in Yellowknife in September?
- In September, Yellowknife averages a daily high of 13.3°C and a low of 7.6°C, with about 24.8 mm of rain over roughly 5.2 rainy days.
- What is the air quality in Yellowknife in September?
- Yellowknife has a mean US Air Quality Index of about 65 in September.