Grumlan Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Grumlan Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Grumlan Lake today is 9.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 47°F (8°C) to 50°F (10°C). This is still cool water, suitable only for experienced swimmers or those accustomed to cold water. Swimming in such conditions is possible, but not recommended for prolonged periods. Extra caution should be taken during extended exposure, as the cold water can cause heat loss and lead to hypothermia. For added comfort, special clothing can be used. 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 |
|---|---|---|---|
| OCT 4 | 11.0°C | 10.0°C | |
| OCT 5 | 10.5°C | 10.0°C | |
| OCT 6 | 10.3°C | 10.0°C | |
| OCT 7 | 10.3°C | 10.0°C | |
| OCT 8 | 10.4°C | 10.0°C | |
| OCT 9 | 10.2°C | 10.0°C | |
| OCT 10 | 9.6°C | 10.0°C | |
| OCT 11 | 9.4°C | 10.0°C | |
| OCT 12 | 10.0°C | 9.4°C | |
| OCT 13 | 10.0°C | 9.5°C | |
| OCT 14 | 10.0°C | 9.5°C | |
| OCT 15 | 10.0°C | 9.5°C | |
| OCT 16 | 10.0°C | 9.6°C | |
| OCT 17 | 10.0°C | 9.6°C | |
| OCT 18 | 10.0°C | 9.6°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 | 4°C | 7°C |
| April | 4°C | 8°C | 11°C |
| May | 9°C | 14°C | 20°C |
| June | 13°C | 19°C | 24°C |
| July | 15°C | 21°C | 26°C |
| August | 14°C | 20°C | 25°C |
| September | 10°C | 15°C | 21°C |
| October | 6°C | 10°C | 13°C |
| November | 3°C | 7°C | 10°C |
| December | 1°C | 5°C | 8°C |
Grumlan Lake: Water Temperature by Location
Grumlan Lake: Weather Forecast
October 11
October 12
October 13
October 14
October 15
Location & Local Information
The lake of Grumlan (Swedish: Grumlan) in Jönköping County typically shows clear seasonal variation in water temperature that shapes swimming conditions. In spring the surface water is cold, often ranging from about 4–12 °C (39–54 °F) as snowmelt and cool air dominate. Summer brings the warmest conditions, with surface temperatures commonly between 18–24 °C (64–75 °F) during calm, sunny periods and occasionally a few degrees higher in heatwaves. Early autumn sees a gradual cooling to roughly 8–15 °C (46–59 °F) as air temperatures fall. In winter the lake can approach freezing, with surface temperatures near 0–4 °C (32–39 °F) and periods of ice cover when the temperature is below 0 °C (32 °F).
Swimming in Grumlan is generally possible and practiced in warm months because of Sweden’s broad public access traditions and accessible shoreline; the warm summer temperatures make recreational bathing comfortable for many people. However, swimming may be inappropriate or unsafe during cold spring and autumn conditions and is hazardous when the lake is iced over unless done with proper ice‑swimming precautions. Local water quality, underwater hazards and any temporary restrictions can affect whether it is advisable to swim, so visitors should check local signage or municipal advisories before entering the water.