23.09
wed
wed
Day
52°F
S 4 mph
Precip.
22%
22%
Night
46°F
SE 11 mph
Precip.
72%
72%
24.09
thu
thu
Day
48°F
NE 8 mph
Precip.
35%
35%
Night
46°F
NW 8 mph
Precip.
12%
12%
25.09
fri
fri
Day
50°F
W 4 mph
Precip.
17%
17%
Night
48°F
W 2 mph
Precip.
21%
21%
26.09
sat
sat
Day
50°F
SW 2 mph
Precip.
21%
21%
Night
48°F
NW 4 mph
Precip.
11%
11%
27.09
sun
sun
Day
50°F
SW 6 mph
Precip.
8%
8%
Night
50°F
W 7 mph
Precip.
12%
12%
28.09
mon
mon
Day
52°F
W 9 mph
Precip.
18%
18%
Night
50°F
NW 4 mph
Precip.
19%
19%
29.09
tue
tue
Day
52°F
W 7 mph
Precip.
18%
18%
Night
57°F
NW 9 mph
Precip.
13%
13%
sea water
temperature
temperature
| Trondheim |
monthly
weather
weather
| Trondheim |
current
weather
weather
| Trondheim |
14 days
forecast
forecast
| Trondheim |
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 55.8°F. The highest and lowest sea temperatures during the month were 58.6°F and 53.6°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 50.9°F. The highest and lowest sea temperatures during the month were 53.2°F and 47.3°F.
Air temperature in Trondheim, °F
Precipitation total in Trondheim, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Trondheim
Trondheim on a weather map
Places in Norway:
Name
°F
24 Hours Forecast
Trondheim
Local time: 08:30
September 23, wednesday
0900
52°F
W
4 mph
4 mph
1200
52°F
S
4 mph
4 mph
1500
52°F
SW
6 mph
6 mph
1800
50°F
SE
6 mph
6 mph
2100
48°F
SE
11 mph
11 mph
September 24, thursday
0000
46°F
SE
11 mph
11 mph
0300
46°F
E
7 mph
7 mph
0600
46°F
E
6 mph
6 mph
