Nisser Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Nisser Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Nisser Lake today is 11.4°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 14 | 12.1°C | 17.0°C | |
| SEP 15 | 12.6°C | 17.0°C | |
| SEP 16 | 12.4°C | 17.0°C | |
| SEP 17 | 12.1°C | 17.0°C | |
| SEP 18 | 11.9°C | 17.0°C | |
| SEP 19 | 11.7°C | 17.0°C | |
| SEP 20 | 11.0°C | 17.0°C | |
| SEP 22 | 17.0°C | 11.7°C | |
| SEP 23 | 17.0°C | 12.0°C | |
| SEP 24 | 17.0°C | 12.2°C | |
| SEP 25 | 17.0°C | 12.5°C | |
| SEP 26 | 17.0°C | 12.8°C | |
| SEP 27 | 17.0°C | 13.1°C | |
| SEP 28 | 17.0°C | 13.4°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 | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 1°C | 6°C | 10°C |
| May | 6°C | 11°C | 17°C |
| June | 10°C | 17°C | 23°C |
| July | 16°C | 21°C | 26°C |
| August | 15°C | 21°C | 26°C |
| September | 11°C | 17°C | 22°C |
| October | 6°C | 10°C | 13°C |
| November | 2°C | 6°C | 9°C |
| December | 0°C | 3°C | 6°C |
Nisser Lake: Water Temperature by Location
Nisser Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Lake Nisser in Telemark typically shows clear seasonal variation in surface water temperature. In spring (April–May) the lake usually warms from around 4–10 °C (39–50 °F) as snowmelt and cooler air still dominate. Summer months (June–August) are when surface temperatures are highest, commonly ranging from roughly 16–22 °C (61–72 °F) on warm days; in sheltered bays or during heat spells temperatures can be a few degrees higher. In autumn (September–October) the surface cools again to approximately 6–12 °C (43–54 °F). During the coldest months the lake may freeze or carry lake ice; water just beneath the ice remains close to 0–2 °C (32–36 °F). Deeper parts of the lake stay significantly colder year-round than the surface.
Swimming in Nisser is permitted and commonly enjoyed in summer because of the milder surface temperatures and many accessible shores. Norwegian public access traditions and local bathing spots make swimming straightforward, but safety considerations are important: water can be chilly outside of the warmest weeks, deeper water and sudden drops in temperature increase cold-shock risk, and ice poses dangers in winter. Many people use wetsuits, choose sheltered beaches, or follow local guidance for safe swimming times and conditions.