Isojärvi — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Isojärvi, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Isojärvi today is 17.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 3 | 14.6°C | 17.0°C | |
| JUN 4 | 14.8°C | 17.0°C | |
| JUN 5 | 16.8°C | 17.0°C | |
| JUN 6 | 16.8°C | 17.0°C | |
| JUN 7 | 17.3°C | 17.0°C | |
| JUN 8 | 17.3°C | 17.0°C | |
| JUN 10 | 17.5°C | 17.0°C | |
| JUN 11 | 17.0°C | 17.7°C | |
| JUN 12 | 17.0°C | 17.6°C | |
| JUN 13 | 17.0°C | 17.6°C | |
| JUN 14 | 17.0°C | 17.6°C | |
| JUN 15 | 17.0°C | 17.5°C | |
| JUN 16 | 17.0°C | 17.5°C | |
| JUN 17 | 17.0°C | 17.5°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 | 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 |
Isojärvi: Water Temperature by Location
Isojärvi: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Isojärvi, meaning Large Lake, is a prominent, shallow-to-medium depth lake located in the Satakunta region, primarily within the municipalities of Pomarkku and Siikainen. Swimming is generally permitted along the lake's extensive shoreline and at designated public beaches, a fundamental right protected by Finland's Everyman’s Rights. This principle grants public freedom to use natural waters for recreation. Due to its size and relatively moderate depth, the lake's water quality is typically monitored during the summer season to ensure it remains suitable for safe seasonal bathing.
The water temperature in Isojärvi follows a distinct annual cycle. During the long winter, from approximately December to April, the lake is generally covered by ice, and the water temperature below the surface consistently hovers between 0∘C and 4∘C. Given its shallower average depth of around three meters, Isojärvi can warm up relatively quickly once the ice melts. The most pleasant swimming season is concentrated in July. During this peak summer month, surface temperatures in sun-exposed areas typically reach an approximate range of 20∘C to 23∘C. Outside of the brief summer period, the water remains too cold for casual swimmers.