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

55.2

°F

June 26, 12:42

Trend:

stable

Yesterday:

55.7°F

Tomorrow:

55.6°F

Sunrise:

03:05

Sunset:

23:37

Day Length:

20 h. 32 min.

Trondheim in July

Minimum:

37.6°F

Average:

41.0°F

Maximum:

42.9°F

Sea water temperature in Trondheim today

As of now, in Trondheim, the water temperature is 55.2°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 2.4°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 rise a bit.

Recent sea temperature and forecast

Today's water temperature is slightly 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 64.8°F on 2020, while the historical minimum was 52.9°F on 2018.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 56.2°F, with minimum temperature starting at 55.3°F, while the maximum might reach 57.4°F.

Daily water temperature in Trondheim

Date Current Year

actual* / forecast**

last year 10 years average
Jun 12 56.6°F 53.8°F 55.8°F
Jun 13 57.2°F 54.1°F 55.7°F
Jun 14 56.4°F 54.9°F 56.1°F
Jun 15 55.8°F 58.4°F 56.5°F
Jun 16 55.6°F 57.8°F 56.2°F
Jun 17 55.8°F 57.2°F 56.0°F
Jun 18 55.2°F 56.6°F 56.2°F
Jun 19 55.7°F 56.5°F 56.2°F
Jun 20 54.1°F 55.9°F 56.6°F
Jun 21 56.2°F 55.6°F 56.4°F
Jun 22 57.6°F 55.7°F 56.6°F
Jun 23 57.5°F 58.8°F 56.9°F
Jun 24 56.7°F 58.1°F 56.8°F
Jun 25 55.7°F 57.5°F 57.1°F
Jun 26 55.2°F 56.9°F 57.6°F
Jun 27 55.6°F 56.3°F 58.0°F
Jun 28 55.5°F 56.1°F 57.9°F
Jun 29 55.3°F 56.1°F 57.7°F
Jun 30 55.8°F 56.3°F 58.2°F
Jul 1 56.6°F 56.5°F 58.9°F
Jul 2 57.0°F 56.7°F 59.3°F
Jul 3 57.4°F 57.0°F 59.8°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 41.7°F in Winter, 43.9°F in Spring, 58.7°F in Summer, and 50.4°F in Autumn.