Mälaren Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Mälaren Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Mälaren Lake today is 5.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 41°F (5°C) to 47°F (8°C). This water temperature is still quite low, and swimming in such conditions may only be comfortable for hardened individuals. It is recommended to limit the time spent in the water to avoid hypothermia. For those not accustomed to cold water, it is better to refrain from swimming. However, if you decide to enter the water, it is advisable to wear a warm wetsuit for protection against the cold. 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 10 | 4.8°C | 7.5°C | |
| APR 11 | 4.8°C | 7.5°C | |
| APR 12 | 4.8°C | 7.5°C | |
| APR 13 | 4.8°C | 7.5°C | |
| APR 14 | 5.1°C | 7.5°C | |
| APR 15 | 5.2°C | 7.5°C | |
| APR 16 | 5.2°C | 7.5°C | |
| APR 17 | 5.2°C | 7.5°C | |
| APR 18 | 7.5°C | 5.9°C | |
| APR 19 | 7.5°C | 6.0°C | |
| APR 20 | 7.5°C | 6.1°C | |
| APR 21 | 7.5°C | 6.1°C | |
| APR 22 | 7.5°C | 6.2°C | |
| APR 23 | 7.5°C | 6.3°C | |
| APR 24 | 7.5°C | 6.4°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 | 3°C | 6°C |
| February | 0°C | 3°C | 6°C |
| March | 0°C | 4°C | 7°C |
| April | 3°C | 8°C | 11°C |
| May | 7°C | 12°C | 18°C |
| June | 13°C | 19°C | 24°C |
| July | 17°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 |
Mälaren Lake: Water Temperature by Location
Mälaren Lake: Weather Forecast
April 18
April 19
April 20
April 21
April 22
Location & Local Information
Mälaren in Södermanland is a large, shallow inland sea whose water temperature varies notably with the seasons and with location in the lake. In winter the surface commonly falls close to freezing, roughly 0–4 °C (32–39 °F), and parts of the lake can freeze over in cold years. During spring the water warms to about 4–12 °C (39–54 °F) as snowmelt and sunlight increase. In summer typical surface temperatures reach between 18–22 °C (64–72 °F), and sheltered bays and shallow areas may climb to 24 °C (75 °F) or slightly higher on hot days. Autumn sees a cooling trend back toward 10–15 °C (50–59 °F) and then toward near-freezing as winter returns.
Swimming in Mälaren is generally allowed and widely practiced, especially from public beaches, piers and marinas during the warmer months when temperatures make bathing comfortable. Local water authorities monitor bathing water quality at designated sites, but conditions can vary with algal growth, boat traffic and runoff, so swimmers should follow posted advisories. Early spring and late autumn swimming is possible but requires caution because of cold-water shock; ice swimming occurs in winter among experienced, well-prepared groups using established safety practices.