Normally the weather in Longyearbyen during September is 3. Highs are expected to be 4 and lows being 0 degrees celsius. We have put some more info below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 3 |
| High Temperature | 4 |
| Low Temperature | 0 |
Useful Links: Longyearbyen Weather: Average Weather & Yearly Climate