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Trondheim
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Norway weather

Weather in Trondheim for September 2025

Your guide to Trondheim weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Trondheim during September is quite rare, with fewer than 2 snowy days on average.
    According to Trondheim snow forecast for September 2025, no snow is expected until the end of the month.

    • Temperatures

  • So far, September 2025 in Trondheim is slightly warmer than the historical average by 1.6 °C.

  • The forecast for the next days in Trondheim predicts a temperature of 9.9 °C, which is cooler than the historical average.

  • In general, the average temperature in Trondheim at the beginning of September is 17.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 8.3 °C by the end of September.

    • Rain 🌧️

  • Trondheim in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 117.7 mm.

Average dry days
11
Dry days
Average rainy days
18
Rainy days
Average snowy days
1
Snow days
Average temperatures
14°/7°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
80 %
Avg humidity

Trondheim Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Mist
18°
2
Cloudy
17°
3
Light drizzle
15°
4
Light rain shower
18°
5
Light rain shower
18°
6
Overcast
18°
7
Overcast
21°
8
Overcast
22°
9
Partly cloudy
21°
10
Light rain shower
15°
11
Light rain shower
18°
12
Partly cloudy
15°
13
Overcast
13°
14
Sunny
15°
15
Partly cloudy
16°
16
Patchy rain possible
13°
17
Moderate rain
12°
18
Partly cloudy
14°
19
Moderate rain
12°
20
Patchy rain possible
10°
21
Patchy rain possible
11°
22
Patchy rain possible
9°
23
Patchy rain possible
9°
24
Patchy rain possible
5°
25
Patchy rain possible
8°
26
Patchy rain possible
8°
27
Partly cloudy
8°
28
Partly cloudy
10°
29
Patchy rain possible
10°
30
Light rain shower
9°

Temperatures trend during September in Trondheim

See the weather trend as well as the moving average line

September weather in Trondheim day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Mist
Mist
 18° /7° 0.2 mm 5
2 Sept. Cloudy
Cloudy
 17° /8° 0 mm 4
3 Sept. Light drizzle
Light drizzle
 15° /8° 0.5 mm 4
4 Sept. Light rain shower
Light rain shower
 18° /11° 6.2 mm 5
5 Sept. Light rain shower
Light rain shower
 18° /10° 7.8 mm 4
6 Sept. Overcast
Overcast
 18° /10° 1.8 mm 4
7 Sept. Overcast
Overcast
 21° /10° 0.1 mm 5
8 Sept. Overcast
Overcast
 22° /10° 0.1 mm 5
9 Sept. Partly cloudy
Partly cloudy
 21° /9° 4.2 mm 6
10 Sept. Light rain shower
Light rain shower
 15° /9° 10.6 mm 4
11 Sept. Light rain shower
Light rain shower
 18° /9° 3.1 mm 4
12 Sept. Partly cloudy
Partly cloudy
 15° /7° 2.9 mm 4
13 Sept. Overcast
Overcast
 13° /5° 0.1 mm 3
14 Sept. Sunny
Sunny
 15° /4° 0 mm 4
15 Sept. Partly cloudy
Partly cloudy
 16° /4° 0 mm 4
16 Sept. Patchy rain possible
Patchy rain possible
 13° /10° 0.4 mm 0.4
17 Sept. Moderate rain
Moderate rain
 12° /8° 6.9 mm 0.3
18 Sept. Partly cloudy
Partly cloudy
 14° /7° 0.1 mm 0.4
19 Sept. Moderate rain
Moderate rain
 12° /9° 9.6 mm 0.3
20 Sept. Patchy rain possible
Patchy rain possible
 10° /7° 0.4 mm 2
21 Sept. Patchy rain possible
Patchy rain possible
 11° /9° 0.4 mm 2
22 Sept. Patchy rain possible
Patchy rain possible
 9° /6° 2.4 mm 2
23 Sept. Patchy rain possible
Patchy rain possible
 9° /6° 1.1 mm 2
24 Sept. Patchy rain possible
Patchy rain possible
 5° /5° 4.8 mm 2
25 Sept. Patchy rain possible
Patchy rain possible
 8° /5° 3.4 mm 2
26 Sept. Patchy rain possible
Patchy rain possible
 8° /5° 3.7 mm 2
27 Sept. Partly cloudy
Partly cloudy
 8° /3° 0 mm 3
28 Sept. Partly cloudy
Partly cloudy
 10° /7° 0 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 10° /6° 0.5 mm 2
30 Sept. Light rain shower
Light rain shower
 9° /3° 3 mm 2
Next
Important Notice
Our weather forecast for Trondheim 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 Trondheim forecast closer to your planned date for the most up-to-date weather information.
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Trondheim in September - FAQ

What are the expected maximum and minimum temperatures in Trondheim during September?
During September, expect a variety of temperatures with highs around 14° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Trondheim during September?
Significant rainfall exceeding 117.7 mm is expected in Trondheim during September, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Trondheim in September 2025?
Trondheim typically sees 1.195 cm of snowfall during September.
What are the typical wind conditions in Trondheim during September?
The average wind speed in Trondheim during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Trondheim

Explore the daily rainfall trends and prepare for Trondheims September weather 💧

UV exposure in Trondheim during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Trondheim?

Get accurate weather forecasts for Trondheim, located at latitude 63.43 and longitude 10.395. Stay updated with localized weather information tailored for Trondheim.

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