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 21.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 14 | 19.2°C | 21.4°C | |
| JUL 15 | 22.1°C | 21.4°C | |
| JUL 16 | 22.2°C | 21.4°C | |
| JUL 17 | 22.2°C | 21.4°C | |
| JUL 18 | 22.2°C | 21.4°C | |
| JUL 19 | 21.5°C | 21.4°C | |
| JUL 20 | 21.4°C | 21.4°C | |
| JUL 21 | 21.2°C | 21.4°C | |
| JUL 22 | 21.4°C | 21.2°C | |
| JUL 23 | 21.4°C | 21.2°C | |
| JUL 24 | 21.4°C | 21.2°C | |
| JUL 25 | 21.4°C | 21.2°C | |
| JUL 26 | 21.4°C | 21.3°C | |
| JUL 27 | 21.4°C | 21.3°C | |
| JUL 28 | 21.4°C | 21.3°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 | 12°C | 19°C | 24°C |
| July | 15°C | 21°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
July 22
July 23
July 24
July 25
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.