Järnsjön — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Järnsjön, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Järnsjön today is 13.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| SEP 13 | 14.6°C | 18.0°C | |
| SEP 14 | 14.5°C | 18.0°C | |
| SEP 15 | 14.5°C | 18.0°C | |
| SEP 16 | 14.3°C | 18.0°C | |
| SEP 17 | 14.1°C | 18.0°C | |
| SEP 18 | 13.8°C | 18.0°C | |
| SEP 19 | 13.6°C | 18.0°C | |
| SEP 20 | 13.5°C | 18.0°C | |
| SEP 21 | 18.0°C | 13.5°C | |
| SEP 22 | 18.0°C | 13.8°C | |
| SEP 23 | 18.0°C | 14.0°C | |
| SEP 24 | 18.0°C | 14.2°C | |
| SEP 25 | 18.0°C | 14.5°C | |
| SEP 26 | 18.0°C | 14.7°C | |
| SEP 27 | 18.0°C | 14.9°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 | 3°C | 7°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 | 16°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 |
Järnsjön: Water Temperature by Location
Järnsjön: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Järnsjön in Värmland County typically follows the seasonal pattern of temperate Swedish lakes. In spring the surface temperature often climbs from near freezing to about 4–10 °C (39–50 °F) as ice melts, while early summer sees 12–20 °C (54–68 °F). Peak summer conditions in July and August can bring surface layers to roughly 18–22 °C (64–72 °F), occasionally reaching around 24 °C (75 °F) during warm spells. Autumn cooling returns temperatures to around 10–15 °C (50–59 °F) in September and down toward 4–6 °C (39–43 °F) by late autumn. In winter the lake commonly freezes and open water temperatures are close to 0–4 °C (32–39 °F) beneath the ice.
Swimming in Järnsjön is generally allowed under Swedish public access rights and many people swim from shores or small beaches when conditions are safe. In summer the water is comfortable for most swimmers, but visitors should be mindful that Swedish lakes can have sudden depth changes, cold currents, and no lifeguards at informal spots. In spring and autumn colder temperatures increase the risk of cold-water shock, and in winter swimming is only for experienced ice swimmers using proper safety measures. Observing local signs, checking water quality, and using flotation or company when swimming improves safety.