Østernvann Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Østernvann Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Østernvann Lake today is 4.6°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 |
|---|---|---|---|
| OCT 24 | 5.6°C | 10.0°C | |
| OCT 25 | 5.7°C | 10.0°C | |
| OCT 26 | 5.5°C | 10.0°C | |
| OCT 27 | 4.8°C | 10.0°C | |
| OCT 28 | 4.9°C | 10.0°C | |
| OCT 29 | 5.0°C | 10.0°C | |
| OCT 30 | 5.1°C | 10.0°C | |
| NOV 1 | 6.0°C | 4.7°C | |
| NOV 2 | 6.0°C | 4.7°C | |
| NOV 3 | 6.0°C | 4.8°C | |
| NOV 4 | 6.0°C | 4.9°C | |
| NOV 5 | 6.0°C | 5.0°C | |
| NOV 6 | 6.0°C | 5.0°C | |
| NOV 7 | 6.0°C | 5.1°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 | 9°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 |
Østernvann Lake: Water Temperature by Location
Østernvann Lake: Weather Forecast
October 31
November 1
November 2
November 3
November 4
Location & Local Information
Østernvann in Akershus County is a typical Norwegian forest lake where surface temperatures vary markedly through the year. In peak summer months (June–August) the water commonly warms to about 15–22 °C (59–72 °F), and during particularly warm spells can reach the mid-20s °C (mid-70s °F). In late spring (April–May) and early autumn (September–October) the lake is usually cooler, roughly 6–14 °C (43–57 °F), while in winter months (November–March) temperatures drop toward 0–4 °C (32–39 °F) and the surface may freeze. These ranges are typical for small inland lakes in the region and vary with weather, depth, and shading from surrounding forest.
Swimming at Østernvann is commonly practised in summer and is generally permitted under Norway’s public right of access, provided you respect private shorelines and local signage. Many people use informal bathing spots and small beaches when temperatures are comfortable; outside the warm season swimming carries risks from cold shock and ice cover, so it is less common and requires precautions. Water quality is usually suitable for bathing in summer but can vary after heavy rain or in presence of algal blooms, so it’s sensible to check local notices if available before swimming.