All data are in degrees Fahrenheit

en

Water temperature in Trondheim

Detailed information about the current water temperature in Trondheim. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Trondheim now

55.4

°F

August 29, 21:14

Trend:

decreasing

Yesterday:

55.4°F

Tomorrow:

55.4°F

Sunrise:

05:53

Sunset:

20:44

Day Length:

14 h. 51 min.

Trondheim in September

Minimum:

37.0°F

Average:

40.4°F

Maximum:

42.3°F

Sea water temperature in Trondheim today

As of now, in Trondheim, the water temperature is 55.4°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 2.7°F lower than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 60.9°F on 2019, while the historical minimum was 55.5°F on 2017.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the minimum recorded over the past years. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 54.8°F, the minimum temperature may reach 54.1°F, and the maximum might stay at 55.4°F.

Daily water temperature in Trondheim

Date Current Year

actual* / forecast**

last year 10 years average
Aug 15 59.8°F 61.1°F 59.5°F
Aug 16 58.9°F 60.3°F 59.7°F
Aug 17 58.7°F 60.2°F 59.6°F
Aug 18 58.6°F 60.3°F 59.3°F
Aug 19 58.5°F 60.5°F 59.4°F
Aug 20 57.7°F 60.3°F 59.6°F
Aug 21 57.7°F 60.3°F 59.4°F
Aug 22 57.7°F 58.9°F 59.3°F
Aug 23 57.6°F 59.1°F 59.1°F
Aug 24 57.5°F 58.8°F 59.0°F
Aug 25 57.3°F 58.6°F 58.7°F
Aug 26 55.9°F 58.4°F 58.7°F
Aug 27 55.8°F 58.2°F 58.3°F
Aug 28 55.4°F 58.0°F 57.8°F
Aug 29 55.4°F 57.8°F 58.1°F
Aug 30 55.4°F 59.5°F 58.1°F
Aug 31 55.1°F 59.0°F 57.8°F
Sep 1 55.0°F 58.9°F 57.7°F
Sep 2 54.7°F 58.5°F 57.4°F
Sep 3 54.6°F 58.8°F 57.3°F
Sep 4 54.4°F 58.7°F 57.1°F
Sep 5 54.1°F 58.8°F 56.8°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Trondheim by month

In an average year, Trondheim offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Trondheim was recorded on July 24, 2025, reaching a 71.6°F. While the coldest temperature occurred on March 16, 2022, dipping to 34.1°F. The average readings by season are 41.6°F in Winter, 43.7°F in Spring, 58.4°F in Summer, and 50.3°F in Autumn.