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Trondheim in September: Weather, Average temperature and Climate

Take a look at past year’s weather for Trondheim in September and see if it is worth visiting.
Check flight prices to Trondheim on Avionero:
September

Weather in Trondheim in September 2024

OK Weather
Mild
☁️
Cloudy
Trondheim in September usually sees fair weather conditions, with an average daily high temperature of +14°C and roughly 2 sunny days. However, you should prepare for about 13 rainy days with an average precipitation of 120 mm. The weather is changeable so pack for every eventuality. Search flights in one click on Avionero.

Average weather

☀️
+14°C
Avg. max. temperature
-2°C
Min.
+25°C
Max.
120 mm
Total precipitation
78%
Avg. humidity
1 m/s
Avg. wind
2 ☀️
Sunny Days
15 ⛅️
Cloudy
13 🌦
Rainy
Our opinion: Trondheim has OK weather in September.

Average temperature in Trondheim in September

Here are the expected maximum, average and minimum temperatures in Trondheim for September based on the historical data.
Last Year
Historical Data

Going from a maximum of +19°C during the day to a minimum of +2°C during the night, the temperature in September averages around +13°C.

The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +14°C to +14°C.

Is Trondheim warm or cold in September?

Trondheim is typically mild in September.

Maximum temperatures go down compared to the previous month from +18°C to +14°C. The minimum temperature also goes down from +10°C to +7°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 Trondheim:

Climate in Trondheim in September

Trondheim weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
Avg. temperature
+18°C+14°C+9°C
Min. temperature
+2°C-2°C-12°C
Max. temperature
+30°C+25°C+22°C
Rainfall
123 mm120 mm90 mm
Wind
1 m/s1 m/s1 m/s
Humidity
77%78%79%
Air pressure
1010 HPa1009 HPa1007 HPa
Sunny days
122
Cloudy days
171517
Rainy days
131311
Snowy days
001

September weather is still as ok as in August. It’s getting colder in September. From +18°C in the day, the average maximum temperature lowers to +14°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 123 mm to 120 mm. Humidity rises from 77% to 78%. The average wind speed doesn’t change much during September, staying around 1 m/s. The good news is there are likely to be more sunny days in September, from 1 to 2.

October brings much the same weather, it remains ok.

Wind

Wind speed in Trondheim in September based on historical data.
Last Year
Historical Data

The average wind speed is 1 m/s getting up to 2 m/s which is a light breeze; barely moving the tree leaves.

The average wind speed in Trondheim is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.

Rain

Amount of rainfall in mm during September in Trondheim based on historical data.
Last Year
Historical Data
Typically, there is a 53% chance of rain on an average day in September, with total rainfall of approximately 124 mm. The maximum amount of rainfall per day is around 34 mm, which is moderate rain. September is a pretty wet month with over 16 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
September is one of the rainiest months in Trondheim, here is a comparison with other months, total mm:
Trondheim wettest month is August, where a typical day has a 42% chance of precipitation and 123 mm of rainfall per day. February, on the other hand, is the driest month with a mere 10% chance of precipitation and 39 mm of rainfall per day.

How was the weather last September in Trondheim?

This is the weather in Trondheim in September 2023:
1 September
☁️
+14°C
2 September
☁️
+16°C
3 September
☁️
+16°C
4 September
☁️
+18°C
5 September
☀️
+17°C
6 September
☁️
+16°C
7 September
☁️
+15°C
8 September
☁️
+19°C
9 September
☀️
+18°C
10 September
☁️
+14°C
11 September
☁️
+13°C
12 September
☁️
+15°C
13 September
🌧️
+13°C
14 September
🌧️
+12°C
15 September
🌧️
+11°C
16 September
🌧️
+10°C
17 September
🌧️
+11°C
18 September
🌧️
+11°C
19 September
🌧️
+10°C
20 September
☁️
+11°C
21 September
☁️
+10°C
22 September
☁️
+12°C
23 September
🌧️
+11°C
24 September
☁️
+11°C
25 September
☁️
+13°C
26 September
🌧️
+12°C
27 September
☁️
+14°C
28 September
☁️
+15°C
29 September
☀️
+13°C
30 September
☀️
+14°C
In September 2023 Trondheim had 4 sunny days, 17 cloudy days, and 9 rainy days. The average maximum temperature was +13°C, with an absolute maximum of +19°C and a minimum of +10°C. The average humidity was 83%, with a maximum of 98% and a minimum of 44%. The average wind speed was 1 m/s, with a maximum of 4 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change over Years

This is how Trondheim climate have been changing during last 43 years period.

The climate in Trondheim in September has not changed much over the last 43 years.

The average temperature was the lowest in 1986 (+11°C) and the highest in 1999 (+19°C). The driest year was 1995 with only 28 mm of rainfall, and the wettest year was 1997 with 283 mm.

FAQ

Frequently asked questions about the weather in Trondheim in September:

Is September a good time to visit Trondheim?

It’s always a good time to visit Trondheim, 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 Trondheim in September?

September has mild temperatures in Trondheim. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!

Is Trondheim rainy in September?

Trondheim 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 Trondheim in September?

Usually, it’s not very sunny in Trondheim in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in Norway

Check out the weather for other cities in Norway.

Monthly weather in Trondheim

Source of the data

For this page, we’ve looked at the typical weather in Trondheim, 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.