Siljan Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Siljan Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Siljan Lake today is 3.9°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 |
|---|---|---|---|
| APR 10 | 2.6°C | 5.0°C | |
| APR 11 | 2.6°C | 5.0°C | |
| APR 12 | 2.7°C | 5.0°C | |
| APR 13 | 2.7°C | 5.0°C | |
| APR 14 | 3.0°C | 5.0°C | |
| APR 15 | 3.1°C | 5.0°C | |
| APR 16 | 3.1°C | 5.0°C | |
| APR 17 | 3.1°C | 5.0°C | |
| APR 18 | 5.0°C | 4.0°C | |
| APR 19 | 5.0°C | 4.0°C | |
| APR 20 | 5.0°C | 4.1°C | |
| APR 21 | 5.0°C | 4.1°C | |
| APR 22 | 5.0°C | 4.2°C | |
| APR 23 | 5.0°C | 4.2°C | |
| APR 24 | 5.0°C | 4.3°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 | 2°C | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 1°C | 5°C | 8°C |
| May | 6°C | 11°C | 17°C |
| June | 12°C | 18°C | 23°C |
| July | 13°C | 19°C | 24°C |
| August | 14°C | 20°C | 25°C |
| September | 11°C | 17°C | 22°C |
| October | 5°C | 9°C | 12°C |
| November | 1°C | 5°C | 8°C |
| December | 0°C | 3°C | 6°C |
Siljan Lake: Water Temperature by Location
Siljan Lake: Weather Forecast
April 18
April 19
April 20
April 21
April 22
Location & Local Information
Lake Siljan (Siljan) in Dalarna County is a large, glacially formed lake with considerable variation in water temperature through the year. After ice-out in spring the surface typically ranges from about 0–8 °C (32–46 °F), warming through late spring and reaching typical summer temperatures of roughly 15–22 °C (59–72 °F), with shallow bays occasionally rising to around 24 °C (75 °F) on warm days. In early autumn the water cools to roughly 6–12 °C (43–54 °F) and in winter the surface often freezes; water temperatures under ice hover close to 0–4 °C (32–39 °F). Local conditions such as wind, depth and sunshine create noticeable differences between open-water areas and sheltered inlets.
Swimming in Siljan is generally permitted and popular in summer where public beaches, piers and designated bathing spots provide access. Many locations are suitable for casual swimming when temperatures are pleasant, and some staffed beaches operate during peak months, but caution is advised because the lake can have sudden depth changes, boat traffic and colder pockets even on warm days. Water quality is usually monitored by municipalities, yet early- and late-season swimming carries a higher hypothermia risk; for cold-water or solitary swims, wetsuits, visible swim aids and adherence to local guidance are recommended. Ice swimming occurs but should only be attempted with proper safety measures.