Kalajärvi Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Kalajärvi Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Kalajärvi Reservoir today is 20.5°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 |
|---|---|---|---|
| JUL 15 | 21.5°C | 20.0°C | |
| JUL 16 | 21.5°C | 20.0°C | |
| JUL 17 | 21.9°C | 20.0°C | |
| JUL 18 | 22.2°C | 20.0°C | |
| JUL 19 | 22.0°C | 20.0°C | |
| JUL 20 | 22.0°C | 20.0°C | |
| JUL 21 | 20.5°C | 20.0°C | |
| JUL 23 | 20.0°C | 20.5°C | |
| JUL 24 | 20.0°C | 20.5°C | |
| JUL 25 | 20.0°C | 20.4°C | |
| JUL 26 | 20.0°C | 20.4°C | |
| JUL 27 | 20.0°C | 20.4°C | |
| JUL 28 | 20.0°C | 20.4°C | |
| JUL 29 | 20.0°C | 20.3°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 |
Kalajärvi Reservoir: Water Temperature by Location
Kalajärvi Reservoir: Weather Forecast
July 22
July 23
July 24
July 25
July 26
July 27
Location & Local Information
Kalajärvi Reservoir, or Kalajärven tekojärvi, is a significant water body in the South Ostrobothnia region, primarily known for its extensive recreational services and popular beach area in Peräseinäjoki. Swimming is widely permitted along the reservoir’s shores and at the large, official public beach, a right upheld by Finland's Everyman’s Rights. Due to its status as a managed reservoir and major leisure destination, the water quality is frequently monitored by local authorities, ensuring it remains safe and hygienically acceptable for bathing during the summer season.
As a relatively shallow, man-made basin in the interior of Finland, Kalajärvi Reservoir experiences notable seasonal temperature variations. During the winter, typically lasting from December to April, the reservoir is reliably frozen over, with water temperatures beneath the ice layer consistently remaining at the colder end of the scale, between 0∘C and 4∘C. The season for comfortable surface swimming is short, primarily centred on July. During this peak summer month, surface temperatures often range from 19∘C to 22∘C, sometimes climbing higher in exceptionally warm weather. Outside of this warm summer window, the water is too cool for casual swimming.