Ähtärinjärvi — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Ähtärinjärvi, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Ähtärinjärvi today is 18.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| AUG 4 | 19.9°C | 20.0°C | |
| AUG 5 | 19.8°C | 20.0°C | |
| AUG 6 | 19.6°C | 20.0°C | |
| AUG 7 | 19.6°C | 20.0°C | |
| AUG 8 | 18.9°C | 20.0°C | |
| AUG 9 | 18.5°C | 20.0°C | |
| AUG 10 | 18.5°C | 20.0°C | |
| AUG 11 | 18.5°C | 20.0°C | |
| AUG 12 | 20.0°C | 18.6°C | |
| AUG 13 | 20.0°C | 18.7°C | |
| AUG 14 | 20.0°C | 18.7°C | |
| AUG 15 | 20.0°C | 18.8°C | |
| AUG 16 | 20.0°C | 18.9°C | |
| AUG 17 | 20.0°C | 19.0°C | |
| AUG 18 | 20.0°C | 19.0°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 | 2°C | 5°C |
| April | 0°C | 3°C | 6°C |
| May | 5°C | 12°C | 18°C |
| June | 11°C | 17°C | 22°C |
| July | 14°C | 20°C | 25°C |
| August | 14°C | 20°C | 25°C |
| September | 10°C | 15°C | 21°C |
| October | 4°C | 8°C | 11°C |
| November | 2°C | 6°C | 9°C |
| December | 0°C | 2°C | 5°C |
Ähtärinjärvi: Water Temperature by Location
Ähtärinjärvi: Weather Forecast
August 12
August 13
August 14
Location & Local Information
Ähtärinjärvi is the second largest lake in South Ostrobothnia, a narrow and long water body notable for its dark, humus-rich waters. Swimming is fully allowed along the lake’s accessible shores and at designated beaches, a right secured by Finland’s Everyman’s Rights. This principle grants public access to natural waters for recreation. Local authorities monitor water quality at official bathing sites, ensuring the water is safe for seasonal use, although the naturally darker color of the water is due to the peat-based soil of the catchment area.
The lake experiences typical seasonal temperature extremes of the Finnish interior. During the winter, generally from December to April, Ähtärinjärvi is ice-covered, with water temperatures below the ice layer remaining near freezing, between 0∘C and 4∘C. The ideal time for comfortable swimming is the short summer, concentrated in July. In this peak month, surface temperatures typically range from 18∘C to 22∘C in sun-exposed, shallower areas. While the water is too cold for casual swimming outside of this summer window, the lake's shores are often used year-round by dedicated cold-water bathers.