Measurements:
°C
°F
CURRENT WEATHER
00:06
Trondheim
48°F
N 8 mph
Feels like: 44°F
Precip: 76%
World Resorts Norway Trondheim Weather

7 Day Weather Forecast

09.09
wed
DAY
52°F
E 6 mph
precip
23%
NIGHT
50°F
E 11 mph
precip
35%
09.10
thu
DAY
52°F
E 19 mph
precip
46%
NIGHT
48°F
NE 2 mph
precip
20%
09.11
fri
DAY
50°F
W 6 mph
precip
17%
NIGHT
50°F
E 15 mph
precip
8%
09.12
sat
DAY
54°F
NE 11 mph
precip
20%
NIGHT
52°F
N 2 mph
precip
25%
09.13
sun
DAY
52°F
E 17 mph
precip
24%
NIGHT
50°F
E 17 mph
precip
28%
09.14
mon
DAY
50°F
E 1 mph
precip
17%
NIGHT
50°F
SW 2 mph
precip
24%
09.15
tue
DAY
54°F
NW 9 mph
precip
23%
NIGHT
52°F
N 7 mph
precip
30%

Trondheim Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Trondheim was 13.3°F. The maximum and minimum values were 11.3°F and 15.2°F respectively.

Trondheim on the Weather Map

Best Time to Visit Trondheim
The most sunny months:
July 8 days
May 8 days
August 8 days
The most warm months:
July 64.8 °F
August 62.9 °F
June 59.8 °F
Warmest sea temperature:
July 60.4 °F
August 60.3 °F
September 55.5 °F
The most cold months:
January 24.1 °F
February 27.2 °F
December 27.4 °F
The most rainy months:
September 6 days
July 5 days
August 5 days
The most windy months:
January 8 mph
December 7 mph
March 7 mph
more details