Bjørnsjøen — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Bjørnsjøen, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Bjørnsjøen today is 11.7°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 | 13.1°C | 15.0°C | |
| SEP 14 | 12.9°C | 15.0°C | |
| SEP 15 | 12.9°C | 15.0°C | |
| SEP 16 | 12.8°C | 15.0°C | |
| SEP 17 | 12.7°C | 15.0°C | |
| SEP 18 | 12.4°C | 15.0°C | |
| SEP 19 | 12.1°C | 15.0°C | |
| SEP 20 | 12.0°C | 15.0°C | |
| SEP 21 | 15.0°C | 11.9°C | |
| SEP 22 | 15.0°C | 12.0°C | |
| SEP 23 | 15.0°C | 12.2°C | |
| SEP 24 | 15.0°C | 12.4°C | |
| SEP 25 | 15.0°C | 12.5°C | |
| SEP 26 | 15.0°C | 12.7°C | |
| SEP 27 | 15.0°C | 12.9°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 | 4°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 2°C | 5°C |
| April | 0°C | 4°C | 7°C |
| May | 5°C | 10°C | 15°C |
| June | 9°C | 16°C | 22°C |
| July | 12°C | 18°C | 23°C |
| August | 13°C | 19°C | 24°C |
| September | 10°C | 15°C | 21°C |
| October | 4°C | 8°C | 11°C |
| November | 0°C | 4°C | 7°C |
| December | 0°C | 2°C | 5°C |
Bjørnsjøen: Water Temperature by Location
Bjørnsjøen: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Bjørnsjøen is a forest lake in the Nordmarka area north of Oslo, and its water temperatures follow the typical seasonal pattern for small, shallow lakes in the region. In spring (March–May) surface temperatures are usually about 2–8 °C (36–46 °F) as snowmelt and cool air keep the water cold. In summer (June–August) the lake commonly warms to roughly 14–22 °C (57–72 °F), with occasional warm spells pushing temperatures toward the upper end. Autumn (September–November) sees cooling surface waters in the range 6–12 °C (43–54 °F), while winter (December–February) temperatures hover around 0–4 °C (32–39 °F) and the lake often freezes over.
Swimming at Bjørnsjøen is allowed and widely practised in the warmer months under Norway’s public access rights, but it is largely informal rather than managed; there are typically no lifeguards and facilities are limited. Water quality in Nordmarka is generally good, making recreational swimming feasible in summer, but visitors should be aware of cold-water shock, variable visibility, and uneven bottoms. In winter the ice can permit winter bathing for experienced people using proper safety measures, but casual swimming is unsafe when the lake is frozen or near freezing.