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 18°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 |
|---|---|---|---|
| AUG 24 | 17.8°C | 20.0°C | |
| AUG 25 | 17.8°C | 20.0°C | |
| AUG 26 | 17.5°C | 20.0°C | |
| AUG 27 | 17.5°C | 20.0°C | |
| AUG 28 | 17.6°C | 20.0°C | |
| AUG 29 | 17.7°C | 20.0°C | |
| AUG 30 | 17.9°C | 20.0°C | |
| AUG 31 | 18.0°C | 20.0°C | |
| SEP 1 | 17.0°C | 18.0°C | |
| SEP 2 | 17.0°C | 17.9°C | |
| SEP 3 | 17.0°C | 17.9°C | |
| SEP 4 | 17.0°C | 17.8°C | |
| SEP 5 | 17.0°C | 17.8°C | |
| SEP 6 | 17.0°C | 17.7°C | |
| SEP 7 | 17.0°C | 17.7°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
September 1
September 2
September 3
September 4
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.