Tunnsjøen — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Tunnsjøen, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Tunnsjøen today is 9.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 47°F (8°C) to 50°F (10°C). This is still cool water, suitable only for experienced swimmers or those accustomed to cold water. Swimming in such conditions is possible, but not recommended for prolonged periods. Extra caution should be taken during extended exposure, as the cold water can cause heat loss and lead to hypothermia. For added comfort, special clothing 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 14 | 10.4°C | 12.0°C | |
| SEP 15 | 10.5°C | 12.0°C | |
| SEP 16 | 10.4°C | 12.0°C | |
| SEP 17 | 9.9°C | 12.0°C | |
| SEP 18 | 10.0°C | 12.0°C | |
| SEP 19 | 9.9°C | 12.0°C | |
| SEP 20 | 9.4°C | 12.0°C | |
| SEP 22 | 12.0°C | 9.4°C | |
| SEP 23 | 12.0°C | 9.6°C | |
| SEP 24 | 12.0°C | 9.7°C | |
| SEP 25 | 12.0°C | 9.8°C | |
| SEP 26 | 12.0°C | 10.0°C | |
| SEP 27 | 12.0°C | 10.1°C | |
| SEP 28 | 12.0°C | 10.2°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 | 2°C | 3°C |
| February | 0°C | 2°C | 3°C |
| March | 0°C | 2°C | 5°C |
| April | 0°C | 2°C | 4°C |
| May | 1°C | 6°C | 11°C |
| June | 8°C | 13°C | 19°C |
| July | 12°C | 18°C | 23°C |
| August | 11°C | 17°C | 22°C |
| September | 7°C | 12°C | 18°C |
| October | 3°C | 7°C | 10°C |
| November | 0°C | 4°C | 7°C |
| December | 0°C | 2°C | 4°C |
Tunnsjøen: Water Temperature by Location
Tunnsjøen: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Lake Tunnsjøen (Norwegian: Tunnsjøen) is a large, deep freshwater lake in Trøndelag County whose size and depth keep its temperatures relatively cool year-round. Surface water in mid to late summer typically ranges from about 12–17 °C (54–63 °F) on warm days, while deeper layers remain much colder. During spring and early summer the surface is often only 0–6 °C (32–43 °F) as snowmelt cools the water, and in autumn temperatures commonly fall to roughly 4–10 °C (39–50 °F). In winter the lake usually freezes or sits close to 0 °C (32 °F) under ice, with sub-surface waters near the temperature of maximum density around 4 °C (39 °F).
Swimming in Tunnsjøen is possible and commonly practised in summer where shore access allows, but it is not a warm bathing lake and caution is advised. The generally good, natural water quality and public access mean swimming is not restricted, yet the cold surface temperatures, steep drop-offs and remote, largely unstaffed shoreline increase the risk of cold shock and hypothermia; safety measures such as gradual immersion, a companion, and dry clothing are recommended. In winter the frozen surface prevents normal swimming except for those who deliberately practice ice bathing under experienced, controlled conditions.