Longyearbyen weather in September
September in Longyearbyen: cold, a little rain, with clean air — a great time to visit.
#4 of 12 months in Longyearbyen · #396 of 604 destinations to visit in September · comfort 73/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Longyearbyen climate normals — September
| Daytime high | 3°C / 38°F | 🧥 cold |
|---|---|---|
| Nighttime low | 0°C / 32°F | |
| Feels like (high) | 0°C / 32°F | |
| Rainfall | 65 mm / 2.6 in | 🌦 some rain |
| Rainy days | 13 days | |
| Humidity | 88% | 💦 very humid |
| Dew point | 0°C / 31°F | |
| Sunshine | 4.1 h/day | |
| Daylight | 14.4 h | |
| Wind | 12 km/h / 8 mph | |
| Snowfall | 15.3 cm / 6 in | |
| Air quality (US AQI) | 25 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Longyearbyen?
Loading map…
Longyearbyen in September — FAQ
- Is September a good time to visit Longyearbyen?
- September in Longyearbyen: cold, a little rain, with clean air — a great time to visit. It ranks #4 of 12 months for Longyearbyen on SeasonMap's comfort score (73/100).
- What is the weather like in Longyearbyen in September?
- In September, Longyearbyen averages a daily high of 3.1°C and a low of 0.1°C, with about 65.2 mm of rain over roughly 12.6 rainy days.
- What is the air quality in Longyearbyen in September?
- Longyearbyen has a mean US Air Quality Index of about 25 in September.
- Does it snow in Longyearbyen in September?
- Longyearbyen sees roughly 15.3 cm of snowfall in September.