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September weather forecast in Trondheim

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	754 mmHg		82%
	3.4 m/s		+13

31 August, Sunday. day, 15°; night, 9°; rain

1 September, mon

	754 mmHg		77%
	3.2 m/s		+13

1 September, Monday. day, 16°; night, 8°; partly cloudy

2 September, tue

	753 mmHg		78%
	3.6 m/s		+13

2 September, Tuesday. day, 16°; night, 8°; overcast

3 September, wed

	753 mmHg		79%
	4 m/s		+13

3 September, Wednesday. day, 16°; night, 9°; rain

4 September, thu

	753 mmHg		79%
	3.7 m/s		+13

4 September, Thursday. day, 15°; night, 9°; rain

5 September, fri

	753 mmHg		79%
	3.5 m/s		+13

5 September, Friday. day, 16°; night, 9°; clear

6 September, sat

	753 mmHg		79%
	3.3 m/s		+13

6 September, Saturday. day, 16°; night, 9°; overcast

7 September, sun

	751 mmHg		79%
	3.9 m/s		+13

7 September, Sunday. day, 16°; night, 9°; rain

8 September, mon

	752 mmHg		77%
	4.1 m/s		+13

8 September, Monday. day, 16°; night, 9°; clear

9 September, tue

	752 mmHg		77%
	4.6 m/s		+13

9 September, Tuesday. day, 15°; night, 9°; partly cloudy

10 September, wed

	752 mmHg		79%
	3.9 m/s		+13

10 September, Wednesday. day, 15°; night, 8°; overcast

11 September, thu

	750 mmHg		79%
	3.8 m/s		+13

11 September, Thursday. day, 16°; night, 8°; rain

12 September, fri

	750 mmHg		79%
	4.1 m/s		+13

12 September, Friday. day, 15°; night, 8°; clear

13 September, sat

	751 mmHg		80%
	4.1 m/s		+13

13 September, Saturday. day, 14°; night, 8°; rain

14 September, sun

	750 mmHg		80%
	4 m/s		+13

14 September, Sunday. day, 14°; night, 8°; overcast

15 September, mon

	750 mmHg		79%
	4.3 m/s		+13

15 September, Monday. day, 14°; night, 8°; rain

16 September, tue

	751 mmHg		79%
	4.19 m/s		+13

16 September, Tuesday. day, 13°; night, 8°; rain

17 September, wed

	752 mmHg		81%
	3.6 m/s		+13

17 September, Wednesday. day, 13°; night, 7°; rain

18 September, thu

	752 mmHg		81%
	4 m/s		+13

18 September, Thursday. day, 14°; night, 7°; rain

19 September, fri

	753 mmHg		81%
	3.6 m/s		+12

19 September, Friday. day, 13°; night, 7°; rain

20 September, sat

	752 mmHg		79%
	4 m/s		+12

20 September, Saturday. day, 13°; night, 7°; overcast

21 September, sun

	752 mmHg		81%
	3.8 m/s		+12

21 September, Sunday. day, 13°; night, 7°; rain

22 September, mon

	751 mmHg		81%
	3.6 m/s		+12

22 September, Monday. day, 12°; night, 7°; rain

23 September, tue

	751 mmHg		82%
	4 m/s		+12

23 September, Tuesday. day, 12°; night, 6°; rain

24 September, wed

	752 mmHg		82%
	4.1 m/s		+12

24 September, Wednesday. day, 12°; night, 6°; rain

25 September, thu

	751 mmHg		79%
	4.19 m/s		+12

25 September, Thursday. day, 13°; night, 6°; clear

26 September, fri

	751 mmHg		78%
	4.5 m/s		+12

26 September, Friday. day, 12°; night, 6°; partly cloudy

27 September, sat

	751 mmHg		79%
	4.69 m/s		+12

27 September, Saturday. day, 12°; night, 6°; rain

28 September, sun

	751 mmHg		80%
	4.4 m/s		+11

28 September, Sunday. day, 12°; night, 6°; partly cloudy

29 September, mon

	751 mmHg		81%
	3.9 m/s		+11

29 September, Monday. day, 11°; night, 6°; rain

30 September, tue

	750 mmHg		80%
	3.6 m/s		+12

30 September, Tuesday. day, 11°; night, 5°; partly cloudy

1 October, wed

	749 mmHg		79%
	4.1 m/s		+11

1 October, Wednesday. day, 12°; night, 6°; rain

2 October, thu

	749 mmHg		80%
	3.8 m/s		+11

2 October, Thursday. day, 11°; night, 6°; partly cloudy

3 October, fri

	748 mmHg		79%
	3.9 m/s		+11

3 October, Friday. day, 11°; night, 6°; rain

4 October, sat

	747 mmHg		78%
	4.69 m/s		+11

4 October, Saturday. day, 11°; night, 6°; rain

Average data for 10 years

Trondheim September

4

sunny days

16

days with precipitation

14

cloudy days

4 sunny days; 16 days with precipitation; 14 cloudy days;

80

%

air humidity

2.6

m/s

WindS

127

mm of precipitation

(11% of annual average)

+13

°C

Water temperature

air humidity 80%; 127 millimeters of precipitation (11% of annual average); Wind southerly 2.6 Meters per second; Water temperature +13°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

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S

S

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1

Average data for 10 years

2

3

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10

11

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20

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30

Daytime temperature

Night-time temperature

Cities near you

Oslo
Gjovik
Are
Lillehammer
Geiranger
Geilo
Molde
Rjukan
Fagernes

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Cholpon-Ata
Oslo
Yurmala
Palanga
Dublin

The weather forecast for September 2025 is based on historical data from the past 10 years.

In September, the weather in Trondheim is typically warm. Average daily high temperature in September is about 14 degrees above zero. On average, Trondheim has 16 rainy, 5 cloudy, 5 partly cloudy, and 4 sunny days in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Trondheim.

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