Gelmersee — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Gelmersee, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Gelmersee today is 13.6°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 2 | 16.9°C | 12.1°C | |
| SEP 3 | 14.3°C | 12.1°C | |
| SEP 4 | 14.1°C | 12.1°C | |
| SEP 5 | 14.4°C | 12.1°C | |
| SEP 6 | 14.3°C | 12.1°C | |
| SEP 7 | 13.9°C | 12.1°C | |
| SEP 8 | 14.0°C | 12.1°C | |
| SEP 9 | 14.4°C | 12.1°C | |
| SEP 10 | 12.1°C | 13.5°C | |
| SEP 11 | 12.1°C | 13.5°C | |
| SEP 12 | 12.1°C | 13.4°C | |
| SEP 13 | 12.1°C | 13.3°C | |
| SEP 14 | 12.1°C | 13.2°C | |
| SEP 15 | 12.1°C | 13.2°C | |
| SEP 16 | 12.1°C | 13.1°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 | 1°C | 1°C |
| February | 0°C | 0°C | 0°C |
| March | 0°C | 1°C | 1°C |
| April | 0°C | 5°C | 9°C |
| May | 4°C | 10°C | 16°C |
| June | 7°C | 15°C | 22°C |
| July | 14°C | 19°C | 24°C |
| August | 14°C | 20°C | 25°C |
| September | 9°C | 12°C | 17°C |
| October | 0°C | 5°C | 9°C |
| November | 0°C | 1°C | 6°C |
| December | 0°C | 1°C | 1°C |
Gelmersee: Water Temperature by Location
Gelmersee: Weather Forecast
September 10
September 11
September 12
September 13
September 14
Location & Local Information
Type: reservoir
Catchment area: 16.0 km2 (6.2 sq mi)
Basin countries: Switzerland
Surface area: 0.645 km2 (0.249 sq mi)
Max. depth: 48 m (157 ft)
Water volume: 13 million cubic metres (11,000 acre⋅ft)
Surface elevation: 1,850 m (6,070 ft)
Gelmersee is a striking turquoise reservoir high above the Haslital, reached via steep alpine terrain. Its elevation of roughly 1,850 m keeps water temperatures low throughout the year. In winter the lake is typically ice-covered, with water close to 0 °C (32 °F). After ice-out in late spring or early summer, temperatures usually remain around 4–7 °C (39–45 °F). During the brief summer window, mainly July and August, the surface may warm to about 8–12 °C (46–54 °F) on calm, sunny days, before cooling quickly again in autumn to below 8 °C (46 °F).
Swimming is not officially prohibited, but it is uncommon and generally not recommended. Gelmersee is used for hydropower, is very deep, and the water remains cold even at the height of summer. Sudden weather changes and limited access points increase risk. Only experienced cold-water swimmers might consider a very short dip in midsummer; for most visitors, the lake is best enjoyed for hiking and scenery rather than swimming.