Longyearbyen
September
Weather in Longyearbyen for September 2025
Your guide to Longyearbyen weather in September - trends and predictions
The climate of Longyearbyen in September is quite snowy, averaging 11 snowy days.
According to Longyearbyen snow forecast for September 2025, 4 snowy days are expected until the end of the month. The closest date with snow is Saturday, 20 September.So far, September 2025 in Longyearbyen is slightly warmer than the historical average by 1.8 °C.
The forecast for the next days in Longyearbyen predicts a temperature of -1.1 °C, which is cooler than the historical average.
In general, the average temperature in Longyearbyen at the beginning of September is 6.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of -0.9 °C by the end of September.
Snow Forecast ❄️
Temperatures
13
Dry days
6
Rainy days
11
Snow days
1°/-1°
Temperatures
15 km/h
Avg max wind
82 %
Avg humidity
Longyearbyen Weather September
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Temperatures trend during September in Longyearbyen
See the weather trend as well as the moving average line
September weather in Longyearbyen day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Sept. |  Overcast | 7° /4° | 0.4 mm | 0 cm | |
| 2 Sept. |  Patchy rain possible | 7° /5° | 1 mm | 0 cm | |
| 3 Sept. |  Sunny | 10° /6° | 0.1 mm | 0 cm | |
| 4 Sept. | Patchy rain possible | 8° /5° | 0.9 mm | 0 cm | |
| 5 Sept. | Patchy rain possible | 8° /3° | 1.9 mm | 0 cm | |
| 6 Sept. |  Light rain | 4° /3° | 7.5 mm | 0 cm | |
| 7 Sept. |  Light freezing rain | 3° /1° | 3.6 mm | 0.1 cm | |
| 8 Sept. |  Moderate or heavy snow showers | 4° /2° | 2.9 mm | 0.6 cm | |
| 9 Sept. | Overcast | 6° /3° | 0.1 mm | 0 cm | |
| 10 Sept. |  Light snow showers | 4° /2° | 1.8 mm | 0.3 cm | |
| 11 Sept. | Moderate or heavy snow showers | 3° /1° | 1 mm | 0.8 cm | |
| 12 Sept. |  Partly cloudy | 4° /1° | 0.2 mm | 0 cm | |
| 13 Sept. | Patchy rain possible | 3° /1° | 1.1 mm | 0 cm | |
| 14 Sept. | Overcast | 3° /1° | 1.6 mm | 0 cm | |
| 15 Sept. | Overcast | 3° /1° | 1.9 mm | 0 cm | |
| 16 Sept. | Moderate or heavy snow showers | 3° /0° | 2.8 mm | 1.1 cm | |
| 17 Sept. | Sunny | -1° /-3° | 0 mm | 0 cm | |
| 18 Sept. | Sunny | -1° /-3° | 0 mm | 0 cm | |
| 19 Sept. | Sunny | -1° /-4° | 0 mm | 0 cm | |
| 20 Sept. |  Moderate snow | -1° /-4° | 0.7 mm | 0.5 cm | |
| 21 Sept. | Partly cloudy | -1° /-4° | 0 mm | 0 cm | |
| 22 Sept. | Sunny | -2° /-4° | 0 mm | 0 cm | |
| 23 Sept. | Overcast | -3° /-5° | 0 mm | 0 cm | |
| 24 Sept. | Partly cloudy | -4° /-6° | 0 mm | 0 cm | |
| 25 Sept. | Partly cloudy | -4° /-6° | 0 mm | 0 cm | |
| 26 Sept. | Partly cloudy | -2° /-5° | 0.1 mm | 0.1 cm | |
| 27 Sept. | Patchy rain possible | 2° /-1° | 4.4 mm | 0.9 cm | |
| 28 Sept. | Overcast | 1° /-1° | 0 mm | 0 cm | |
| 29 Sept. | Patchy rain possible | 3° /-1° | 0.2 mm | 0 cm | |
| 30 Sept. | Partly cloudy | -2° /-4° | 0.7 mm | 0.6 cm | |
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Important Notice
Our weather forecast for Longyearbyen in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Longyearbyen forecast closer to your planned date for the most up-to-date weather information.
Change Month
Longyearbyen in September - FAQ
What are the expected maximum and minimum temperatures in Longyearbyen during September?
Brace for cold days with temperatures not exceeding 1° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Longyearbyen during September?
In September, Longyearbyen can expect light to moderate rainfall, totaling 31.1 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.
Will it snow in Longyearbyen in September 2025?
Longyearbyen experiences an average snowfall of 8.5 cm during September, occurring over 11 days.
What are the typical wind conditions in Longyearbyen during September?
The average wind speed in Longyearbyen during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
Longyearbyen snow forecast September 2025
Track daily snowfall levels and discover Longyearbyen’s snowy potential this September ❄️
September rainfall patterns in Longyearbyen
Explore the daily rainfall trends and prepare for Longyearbyens September weather 💧
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Where is Longyearbyen?Get accurate weather forecasts for Longyearbyen, located at latitude 78.223 and longitude 15.647. Stay updated with localized weather information tailored for Longyearbyen.
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