Maridalsvannet — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Maridalsvannet, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Maridalsvannet today is 18.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| JUL 16 | 19.8°C | 21.9°C | |
| JUL 17 | 20.8°C | 21.9°C | |
| JUL 18 | 20.8°C | 21.9°C | |
| JUL 19 | 20.8°C | 21.9°C | |
| JUL 20 | 20.8°C | 21.9°C | |
| JUL 21 | 18.8°C | 21.9°C | |
| JUL 22 | 19.0°C | 21.9°C | |
| JUL 24 | 21.9°C | 19.0°C | |
| JUL 25 | 21.9°C | 19.1°C | |
| JUL 26 | 21.9°C | 19.3°C | |
| JUL 27 | 21.9°C | 19.4°C | |
| JUL 28 | 21.9°C | 19.6°C | |
| JUL 29 | 21.9°C | 19.7°C | |
| JUL 30 | 21.9°C | 19.9°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 | 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 | 18°C |
| June | 10°C | 17°C | 24°C |
| July | 16°C | 22°C | 27°C |
| August | 17°C | 22°C | 27°C |
| September | 12°C | 18°C | 23°C |
| October | 7°C | 11°C | 14°C |
| November | 3°C | 7°C | 10°C |
| December | 0°C | 4°C | 7°C |
Maridalsvannet: Water Temperature by Location
Maridalsvannet: Weather Forecast
July 23
July 24
July 25
July 26
July 27
Location & Local Information
Maridalsvannet is the primary drinking water reservoir for Oslo, Norway, and its name in Norwegian is Maridalsvannet. Water temperatures vary seasonally: in spring (April–May) surface values commonly range from about 4–10 °C (39–50 °F) as ice melts and the lake stratifies; in summer (June–August) surface temperatures typically reach roughly 13–22 °C (55–72 °F) on warm days, though deeper water remains considerably cooler; autumn (September–October) sees cooling to around 6–14 °C (43–57 °F); and in winter (November–March) the lake often approaches freezing, about 0–4 °C (32–39 °F), with ice cover possible in cold spells. Local weather and specific years influence these figures, so short-term conditions can differ from the averages above.
Swimming opportunities at Maridalsvannet are very limited because the lake functions as Oslo’s drinking-water source and is protected for water quality reasons. Bathing and recreational access to the shoreline are generally restricted or prohibited by regulations and signage to minimize contamination risks and protect treatment operations. For those seeking outdoor swimming in the Oslo area, permitted public lakes and designated swimming sites are available elsewhere; at Maridalsvannet, recreational use is curtailed to safeguard the municipal water supply.