Last updated: March 2, 2024
The weather in Longyearbyen, Svalbard and Jan Mayen, during September is characterized by an average temperature of 2°C (35°F). Highs can soar to 7°C (45°F), while lows may dip to -5°C (23°F). Typically, the humidity level in Longyearbyen throughout September hovers around 99%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Longyearbyen averages 75 mm (3.0 inches) of rainfall, typically over the course of 16 rainy days. The month enjoys an average of 14 hours 16 minutes of daylight, with the sun shining for approximately 4 hours 22 minutes each day. Additionally, there is a 14% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Longyearbyen reaches a maximum of 1, indicating a level of Low exposure. The most intense UV radiation typically occurs between 04:00 and 06:00, during which unprotected skin may burn in as little as 45 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Exposure | Low | ||||||||||||
| Time to burn | 45 min | ||||||||||||