If you plan to visit Tromso in September, the weather is typically alright, with an average high temperature of +12°C during the day and approximately 2 sunny days. Expect some rainy, though, as there are typically 21 rainy days in the month and around 128 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+12°C
Avg. max. temperature
-5°C
Min.
+21°C
Max.
128 mm
Total precipitation
81%
Avg. humidity
2 m/s
Avg. wind
2 ☀️
Sunny Days
6 ⛅️
Cloudy
21 🌦
Rainy
Our opinion: Tromso has OK weather in September.
Average temperature in Tromso in September
Here are the expected maximum, average and minimum temperatures in Tromso for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +20°C during the day to a minimum of +2°C during the night, the temperature in September averages around +12°C.
The average maximum temperature goes down 11% by the end of the month, compared with the beginning of the month, from +15°C to +13°C.
Is Tromso warm or cold in September?
Tromso is typically mild in September.
Maximum temperatures go down compared to the previous month from +16°C to +12°C. The minimum temperature also goes down from +9°C to +6°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Tromso:
Water temperature in Tromso in September
Water in Tromso in September is Cold. It varies from +9°C to +12°C, with an average of +10°C.This is almost similar to the air temperature, which averages +12°C.
The water temperature in September is one of the warmest of the entire year:
The warmest water temperatures in Tromso are reached in August, when the average sea temperature rises to +11°C. The coldest water temperatures are in March, with an average of +4°C.
Can you swim in Tromso in September?
We would not recommend swimming in Tromso in September, the water is very cold (+10°C on average). Consider swimming only if you are an experienced cold-water swimmer with proper gear.
🦭
Cold
Below +16°C
🏄♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
You will need a full-body wetsuit, cap, gloves, a warm change of clothes, and a hot drink ready for after your swim.
Climate in Tromso in September
Tromso weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+16°C
+12°C
+6°C
Min. temperature
+2°C
-5°C
-21°C
Max. temperature
+29°C
+21°C
+17°C
Rainfall
109 mm
128 mm
124 mm
Wind
2 m/s
2 m/s
3 m/s
Avg. water temperature
+11°C
+10°C
+8°C
Humidity
79%
81%
81%
Air pressure
1010 HPa
1008 HPa
1006 HPa
Sunny days
2
2
2
Cloudy days
9
6
7
Rainy days
20
21
15
Snowy days
0
0
7
September weather is still as ok as in August.It’s getting colder in September. From +16°C in the day, the average maximum temperature lowers to +12°C.Prepare for more rain. Average rainfall goes from 109 mm to 128 mm.Humidity rises from 79% to 81%.The average wind speed doesn’t change much during September, staying around 2 m/s.The amount of sunny days stay about the same, averaging 2 sunny days during the month.
October brings much the same weather, it remains ok.
Wind speed in Tromso in September based on historical data.
Last Year
Historical Data
The average wind speed is 4 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 Tromso is gradually decreasing during September, going from 5 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Tromso based on historical data.
Last Year
Historical Data
Typically, there is a 87% chance of rain on an average day in September, with total rainfall of approximately 210 mm. The maximum amount of rainfall per day is around 32 mm, which is moderate rain.September is a pretty wet month with over 26 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
September is one of the rainiest months in Tromso, here is a comparison with other months, total mm:
Tromso wettest month is September, where a typical day has a 70% chance of precipitation and 128 mm of rainfall per day. February, on the other hand, is the driest month with a mere 7% chance of precipitation and 47 mm of rainfall per day.
How was the weather last September in Tromso?
This is the weather in Tromso in September 2023:
1 September
☁️
+15°C
2 September
☁️
+14°C
3 September
🌧️
+16°C
4 September
🌧️
+13°C
5 September
🌧️
+11°C
6 September
🌧️
+12°C
7 September
🌧️
+15°C
8 September
🌧️
+19°C
9 September
🌧️
+18°C
10 September
🌧️
+20°C
11 September
🌧️
+12°C
12 September
🌧️
+11°C
13 September
🌧️
+8°C
14 September
🌧️
+9°C
15 September
☀️
+11°C
16 September
🌧️
+10°C
17 September
🌧️
+9°C
18 September
🌧️
+10°C
19 September
☀️
+7°C
20 September
☁️
+9°C
21 September
☀️
+8°C
22 September
☁️
+11°C
23 September
☁️
+11°C
24 September
☁️
+10°C
25 September
🌧️
+10°C
26 September
🌧️
+13°C
27 September
☀️
+15°C
28 September
☀️
+12°C
29 September
🌧️
+12°C
30 September
🌧️
+13°C
In September 2023 Tromso had 5 sunny days, 6 cloudy days, and 19 rainy days. The average maximum temperature was +12°C, with an absolute maximum of +20°C and a minimum of +7°C. The average humidity was 85%, with a maximum of 100% and a minimum of 59%. The average wind speed was 4 m/s, with a maximum of 14 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change over Years
This is how Tromso climate have been changing during last 43 years period.
The climate in Tromso in September has not changed much over the last 43 years.
The average temperature was the lowest in 1981 (+4°C) and the highest in 1990 (+8°C). The driest year was 1980 with only 614 mm of rainfall, and the wettest year was 1989 with 1352 mm.
FAQ
Frequently asked questions about the weather in Tromso in September:
Is September a good time to visit Tromso?
It’s always a good time to visit Tromso, 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 Tromso in September?
September has mild temperatures in Tromso. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Can you swim in Tromso in September?
Swimming in Tromso in September is challenging and not recommended for inexperienced swimmers or without proper equipment and preparation.
Is Tromso rainy in September?
Tromso is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Tromso in September?
Usually, it’s not very sunny in Tromso 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 Tromso, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
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.
