All data are in degrees Fahrenheit

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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

58.2

°F

August 4, 23:58

Trend:

stable

Yesterday:

59.3°F

Tomorrow:

58.2°F

Sunrise:

04:40

Sunset:

22:07

Day Length:

17 h. 27 min.

Trondheim in August

Minimum:

37.2°F

Average:

40.8°F

Maximum:

42.9°F

Sea water temperature in Trondheim today

As of now, in Trondheim, the water temperature is 58.2°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 3.7°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 slightly varies from the average of the past two weeks. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 67.6°F on 2025, while the historical minimum was 57.8°F on 2022.

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 57.6°F, the minimum temperature may reach 56.9°F, and the maximum might stay at 58.2°F.

Daily water temperature in Trondheim

Date Current Year

actual* / forecast**

last year 10 years average
Jul 21 58.0°F 71.5°F 61.0°F
Jul 22 57.7°F 69.3°F 60.7°F
Jul 23 58.2°F 69.9°F 60.9°F
Jul 24 57.3°F 71.6°F 60.9°F
Jul 25 57.4°F 70.1°F 61.4°F
Jul 26 57.5°F 68.9°F 61.1°F
Jul 27 58.0°F 67.9°F 61.1°F
Jul 28 57.9°F 67.0°F 61.1°F
Jul 29 57.8°F 66.3°F 61.5°F
Jul 30 57.9°F 65.6°F 61.6°F
Jul 31 58.0°F 65.7°F 61.4°F
Aug 1 58.4°F 65.2°F 61.7°F
Aug 2 59.7°F 65.4°F 61.5°F
Aug 3 59.3°F 65.8°F 61.6°F
Aug 4 58.2°F 67.6°F 61.8°F
Aug 5 58.2°F 67.0°F 61.8°F
Aug 6 58.0°F 65.6°F 61.7°F
Aug 7 58.0°F 65.2°F 61.6°F
Aug 8 57.8°F 64.4°F 61.5°F
Aug 9 57.3°F 63.9°F 61.0°F
Aug 10 56.9°F 63.5°F 60.5°F
Aug 11 56.9°F 63.5°F 60.5°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 41.7°F in Winter, 43.9°F in Spring, 58.6°F in Summer, and 50.4°F in Autumn.