Trondheim — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Trondheim, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Trondheim today is 10.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 50°F (10°C) to 54°F (12°C). The water is slightly warmer, but still cool for most people. Swimming in such conditions is possible, but for most people, the time spent in the water should be limited to avoid hypothermia. Even experienced swimmers may feel discomfort if they stay in the water for too long. To improve comfort and safety, a wetsuit can be used. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| SEP 13 | 12.2°C | 11.0°C | |
| SEP 14 | 12.0°C | 11.0°C | |
| SEP 15 | 12.0°C | 11.0°C | |
| SEP 16 | 11.6°C | 11.0°C | |
| SEP 17 | 11.5°C | 11.0°C | |
| SEP 18 | 11.1°C | 11.0°C | |
| SEP 19 | 11.2°C | 11.0°C | |
| SEP 20 | 11.0°C | 11.0°C | |
| SEP 21 | 11.0°C | 10.7°C | |
| SEP 22 | 11.0°C | 10.7°C | |
| SEP 23 | 11.0°C | 10.7°C | |
| SEP 24 | 11.0°C | 10.8°C | |
| SEP 25 | 11.0°C | 10.8°C | |
| SEP 26 | 11.0°C | 10.8°C | |
| SEP 27 | 11.0°C | 10.8°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 1°C | 4°C |
| February | 0°C | 1°C | 4°C |
| March | 0°C | 1°C | 4°C |
| April | 0°C | 2°C | 5°C |
| May | 2°C | 7°C | 11°C |
| June | 7°C | 13°C | 18°C |
| July | 12°C | 17°C | 21°C |
| August | 10°C | 15°C | 19°C |
| September | 7°C | 11°C | 16°C |
| October | 3°C | 7°C | 9°C |
| November | 0°C | 3°C | 5°C |
| December | 0°C | 1°C | 4°C |
Trondheim: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Trondheim (in Norwegian: Trondheim) in Trøndelag County lies close to both forested lakes and the Trondheim Fjord, and lake water temperatures vary strongly with season, weather and depth. In spring and early summer typical lake temperatures range from about 4–12 °C (39–54 °F), rising through June and July to common summer values of roughly 14–20 °C (57–68 °F); in shallow, sheltered ponds and warm summers surface temperatures can briefly reach 20–22 °C (68–72 °F). In autumn lakes cool back to around 8–14 °C (46–57 °F) before freezing in winter, when surface temperatures approach 0–4 °C (32–39 °F) under ice.
Swimming is a popular summer activity in and around Trondheim, and many lakes and shoreline spots are used for bathing when temperatures are comfortable. Swimming is generally allowed in natural lakes, but restrictions exist at certain locations: drinking-water reservoirs such as Jonsvatnet are subject to rules that can prohibit bathing to protect water quality, and local signage should be followed. Water quality is monitored by municipal authorities at public bathing sites, but most smaller lakes and remote spots lack lifeguards and can be cold even in summer, so caution and awareness of cold-water shock, currents and local rules are advised.