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 20.2°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 |
|---|---|---|---|
| JUN 23 | 16.5°C | 19.0°C | |
| JUN 24 | 16.5°C | 19.0°C | |
| JUN 25 | 16.5°C | 19.0°C | |
| JUN 26 | 18.0°C | 19.0°C | |
| JUN 27 | 18.0°C | 19.0°C | |
| JUN 28 | 18.0°C | 19.0°C | |
| JUN 29 | 19.4°C | 19.0°C | |
| JUN 30 | 20.2°C | 19.0°C | |
| JUL 1 | 21.0°C | 20.2°C | |
| JUL 2 | 21.0°C | 20.3°C | |
| JUL 3 | 21.0°C | 20.3°C | |
| JUL 4 | 21.0°C | 20.4°C | |
| JUL 5 | 21.0°C | 20.4°C | |
| JUL 6 | 21.0°C | 20.4°C | |
| JUL 7 | 21.0°C | 20.5°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 | 16°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
July 1
July 2
July 3
July 4
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.