If you plan to visit Longyearbyen in September, the weather is typically alright, with an average high temperature of +3°C during the day and approximately 0 sunny days. Expect some rainy, though, as there are typically 8 rainy days in the month and around 33 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Good to know:
September is usually the wettest month of the year in Longyearbyen;
Average weather
☀️
+3°C
Avg. max. temperature
-13°C
Min.
+14°C
Max.
33 mm
Total precipitation
87%
Avg. humidity
3 m/s
Avg. wind
0 ☀️
Sunny Days
15 ⛅️
Cloudy
8 🌦
Rainy
Our opinion: Longyearbyen has OK weather in September.
Average temperature in Longyearbyen in September
Here are the expected maximum, average and minimum temperatures in Longyearbyen for September based on the historical data.
Last Year
Historical Data
The temperature in September is +2°C on average, with a range between a maximum of +8°C during the day and a minimum of -8°C at night.
The average maximum temperature goes down 37% by the end of the month, compared with the beginning of the month, from +6°C to 0°C.
Is Longyearbyen warm or cold in September?
Longyearbyen is typically cool in September.
Maximum temperatures go down compared to the previous month from +7°C to +3°C. The minimum temperature also goes down from +4°C to -1°C.
Pack a sweater and a jacket as there will be cooler temperatures.
Take a look at how September is compared to other months in Longyearbyen:
Climate in Longyearbyen in September
Longyearbyen weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+7°C
+3°C
-4°C
Min. temperature
-5°C
-13°C
-23°C
Max. temperature
+15°C
+14°C
+8°C
Rainfall
38 mm
33 mm
12 mm
Wind
3 m/s
3 m/s
3 m/s
Humidity
84%
87%
85%
Air pressure
1011 HPa
1008 HPa
1009 HPa
Sunny days
1
0
0
Cloudy days
17
15
17
Rainy days
13
8
2
Snowy days
1
7
11
September weather is still as ok as in August.It’s getting colder in September. From +7°C in the day, the average maximum temperature lowers to +3°C.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 38 mm to 33 mm.Humidity rises from 84% to 87%.The average wind speed doesn’t change much during September, staying around 3 m/s.The days becoming less sunny, going from 1 sunny days in August to 0 in September.
October brings much the same weather, it remains ok.
Wind speed in Longyearbyen in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Longyearbyen is gradually increasing during September, going from 3 m/s to 3 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Longyearbyen based on historical data.
Last Year
Historical Data
Total precipitation in September is about 40 mm, with a 23% chance of rain on a typical day. The maximum amount of rainfall per day is around 14 mm, which is considered light rain.On average, there are about 7 rainy days during September, so prepare to bring an umbrella.
September is one of the rainiest months in Longyearbyen, here is a comparison with other months, total mm:
Longyearbyen wettest month is August, where a typical day has a 42% chance of precipitation and 38 mm of rainfall per day. April, on the other hand, is the driest month with a mere 0% chance of precipitation and 1 mm of rainfall per day.
Snow
Amount of snow in mm during September in Longyearbyen based on historical data.
Last Year
Historical Data
Typically, there is a 10% chance of snow on an average day in September, with a total monthly snowfall of approximately 12 mm.
Here’s how September is compared with other months in the amount of snow, total mm:
How was the weather last September in Longyearbyen?
This is the weather in Longyearbyen in September 2023:
1 September
☁️
+6°C
2 September
☁️
+7°C
3 September
☁️
+6°C
4 September
🌧️
+8°C
5 September
🌧️
+7°C
6 September
🌧️
+6°C
7 September
☁️
+5°C
8 September
🌧️
+7°C
9 September
☁️
+7°C
10 September
☁️
+4°C
11 September
☁️
+4°C
12 September
☁️
+3°C
13 September
☁️
+3°C
14 September
☁️
+3°C
15 September
🌨️
+3°C
16 September
☁️
0°C
17 September
🌨️
-1°C
18 September
☀️
-2°C
19 September
☀️
-1°C
20 September
☀️
-2°C
21 September
☁️
-1°C
22 September
☁️
-1°C
23 September
☀️
-2°C
24 September
☁️
-3°C
25 September
☁️
-3°C
26 September
☀️
-5°C
27 September
☀️
-5°C
28 September
🌨️
0°C
29 September
☁️
+1°C
30 September
☁️
0°C
In September 2023 Longyearbyen had 6 sunny days, 17 cloudy days, and 4 rainy days. The average maximum temperature was +2°C, with an absolute maximum of +8°C and a minimum of -5°C. The average humidity was 86%, with a maximum of 100% and a minimum of 69%. The average wind speed was 3 m/s, with a maximum of 13 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change over Years
This is how Longyearbyen climate have been changing during last 43 years period.
The climate in Longyearbyen in September has not changed much over the last 43 years.
The average temperature was the lowest in 1988 (-7°C) and the highest in 2016 (+1°C). The driest year was 1998 with only 51 mm of rainfall, and the wettest year was 2016 with 381 mm.
FAQ
Frequently asked questions about the weather in Longyearbyen in September:
Is September a good time to visit Longyearbyen?
It’s always a good time to visit Longyearbyen, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Longyearbyen in September?
Not really, September is not the best time to sunbathe, unless you visit a local solarium.
Is Longyearbyen rainy in September?
Longyearbyen is usually dry in September. Plan your packing around outdoor activities and exploring.
Is it sunny in Longyearbyen in September?
Usually, it’s not very sunny in Longyearbyen in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Longyearbyen, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.