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

49.5

°F

October 17, 02:11

Trend:

stable

Yesterday:

49.3°F

Tomorrow:

49.4°F

Sunrise:

08:11

Sunset:

17:55

Day Length:

9 h. 44 min.

Trondheim in October

Minimum:

37.5°F

Average:

41.1°F

Maximum:

43.4°F

Sea water temperature in Trondheim today

As of now, in Trondheim, the water temperature is 49.5°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 0.8°F lower than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to fall a bit.

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 51.6°F on 2025, while the historical minimum was 48.7°F on 2022.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 48.6°F, the minimum temperature may reach 47.9°F, and the maximum might stay at 49.4°F.

Daily water temperature in Trondheim

Date Current Year

actual* / forecast**

last year 10 years average
Oct 3 52.8°F 52.9°F 52.4°F
Oct 4 52.3°F 52.6°F 52.2°F
Oct 5 52.0°F 53.3°F 52.1°F
Oct 6 51.7°F 53.3°F 51.9°F
Oct 7 52.1°F 52.8°F 51.7°F
Oct 8 51.7°F 52.4°F 51.5°F
Oct 9 51.2°F 52.6°F 51.2°F
Oct 10 51.0°F 52.3°F 51.0°F
Oct 11 50.6°F 52.4°F 50.8°F
Oct 12 50.5°F 52.2°F 50.7°F
Oct 13 50.1°F 52.4°F 50.7°F
Oct 14 50.2°F 51.3°F 50.5°F
Oct 15 49.6°F 52.2°F 50.1°F
Oct 16 49.3°F 51.5°F 50.1°F
Oct 17 49.5°F 51.6°F 50.3°F
Oct 18 49.4°F 51.4°F 50.2°F
Oct 19 48.9°F 51.1°F 49.7°F
Oct 20 48.9°F 50.5°F 49.7°F
Oct 21 48.5°F 50.1°F 49.3°F
Oct 22 48.3°F 49.5°F 49.1°F
Oct 23 48.3°F 47.9°F 49.1°F
Oct 24 47.9°F 49.0°F 48.7°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.