Notodden — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Notodden, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Notodden today is 4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges less than 41°F (5°C). Such water is extremely cold and not recommended for swimming without proper preparation. In these conditions, the risk of hypothermia is very high, and prolonged exposure to the water can be hazardous to your health. If you decide to swim, it is important to have the appropriate gear, such as a wetsuit. Typically, only experienced swimmers or those who practice winter swimming venture into such waters. 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 |
|---|---|---|---|
| APR 11 | 3.7°C | 6.9°C | |
| APR 12 | 3.9°C | 6.9°C | |
| APR 13 | 3.7°C | 6.9°C | |
| APR 14 | 3.7°C | 6.9°C | |
| APR 15 | 3.7°C | 6.9°C | |
| APR 16 | 3.8°C | 6.9°C | |
| APR 17 | 4.0°C | 6.9°C | |
| APR 18 | 4.0°C | 6.9°C | |
| APR 19 | 6.9°C | 4.1°C | |
| APR 20 | 6.9°C | 4.3°C | |
| APR 21 | 6.9°C | 4.4°C | |
| APR 22 | 6.9°C | 4.6°C | |
| APR 23 | 6.9°C | 4.7°C | |
| APR 24 | 6.9°C | 4.9°C | |
| APR 25 | 6.9°C | 5.0°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 | 3°C | 6°C |
| February | 0°C | 3°C | 6°C |
| March | 0°C | 4°C | 7°C |
| April | 2°C | 7°C | 11°C |
| May | 7°C | 12°C | 17°C |
| June | 13°C | 18°C | 23°C |
| July | 16°C | 21°C | 26°C |
| August | 16°C | 21°C | 26°C |
| September | 12°C | 17°C | 22°C |
| October | 7°C | 11°C | 14°C |
| November | 3°C | 7°C | 10°C |
| December | 0°C | 4°C | 7°C |
Notodden: Weather Forecast
April 19
April 20
April 21
April 22
Location & Local Information
Notodden, in Telemark county, sits beside several inland water bodies such as Heddalsvatnet and the rivers that feed and drain it. Seasonal water temperatures in these lakes typically range from near freezing in winter, around 0–4 °C (32–39 °F) under ice, to spring values of roughly 4–12 °C (39–54 °F) as snowmelt and cool weather persist. In the warmest months, shallow bays and sheltered spots can reach about 16–22 °C (61–72 °F) in July and August, while deeper or exposed parts often remain cooler, around 10–16 °C (50–61 °F). Rivers in the area are generally colder and more variable: late spring runoff can keep them in the 4–10 °C (39–50 °F) range, with summer temperatures commonly between 8–14 °C (46–57 °F), depending on flow and depth.
Swimming in Notodden’s lakes and in calmer river sections is commonly practiced and permitted where public access exists, but conditions and rules vary. Local beaches and access points are popular in summer, yet safety considerations—cold water shock, sudden depth changes, strong currents and fluctuations from hydropower operations, and seasonal water quality checks—mean swimmers should heed signage and local advice. Winter ice swimming occurs among experienced people where ice and water quality are known to be safe, but it requires proper precautions and knowledge.