Iso-Roine Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Iso-Roine Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Iso-Roine Lake today is 21°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 14 | 20.5°C | 20.0°C | |
| JUL 15 | 22.1°C | 20.0°C | |
| JUL 16 | 22.1°C | 20.0°C | |
| JUL 17 | 22.4°C | 20.0°C | |
| JUL 18 | 22.8°C | 20.0°C | |
| JUL 19 | 22.2°C | 20.0°C | |
| JUL 20 | 22.2°C | 20.0°C | |
| JUL 21 | 21.5°C | 20.0°C | |
| JUL 22 | 20.0°C | 21.0°C | |
| JUL 23 | 20.0°C | 20.9°C | |
| JUL 24 | 20.0°C | 20.9°C | |
| JUL 25 | 20.0°C | 20.8°C | |
| JUL 26 | 20.0°C | 20.8°C | |
| JUL 27 | 20.0°C | 20.7°C | |
| JUL 28 | 20.0°C | 20.7°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 | 3°C | 6°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 2°C | 5°C |
| April | 0°C | 4°C | 7°C |
| May | 5°C | 10°C | 15°C |
| June | 10°C | 15°C | 21°C |
| July | 14°C | 20°C | 25°C |
| August | 14°C | 20°C | 25°C |
| September | 11°C | 17°C | 22°C |
| October | 5°C | 9°C | 12°C |
| November | 1°C | 5°C | 8°C |
| December | 0°C | 3°C | 6°C |
Iso-Roine Lake: Water Temperature by Location
Iso-Roine Lake: Weather Forecast
July 22
July 23
July 24
July 25
July 26
July 27
Location & Local Information
Lake Iso-Roine, located in the Kanta-Häme region of southern Finland near Hauho, is a deep and clear freshwater lake that is part of the Kokemäenjoki water system. Because of its considerable depth, the water temperature in Iso-Roine changes more slowly than in smaller nearby lakes. In spring, after the ice melts, the surface water remains cold at around 5–8 °C (41–46 °F). During early summer, the temperature rises to 14–17 °C (57–63 °F), and in July, at the warmest time of year, it typically reaches 18–21 °C (64–70 °F). In shallow bays, water may briefly warm to 22–23 °C (72–73 °F). By autumn, temperatures drop below 10 °C (50 °F), and the lake usually freezes in late November or December.
Swimming in Iso-Roine is officially allowed and widely enjoyed during the summer. The lake’s water is clean and of good quality, with several small beaches and piers around Hauho and nearby villages. Because of the depth, the water stays refreshingly cool even in July, making it ideal for open-water swimming and other water activities. The surrounding nature, quiet atmosphere, and scenic forested shores provide an inviting environment for relaxation and swimming in a natural Finnish setting.