Lahnajärvi — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lahnajärvi, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lahnajärvi today is 18.8°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 | 20.4°C | 20.0°C | |
| AUG 5 | 20.1°C | 20.0°C | |
| AUG 6 | 20.2°C | 20.0°C | |
| AUG 7 | 20.2°C | 20.0°C | |
| AUG 8 | 20.0°C | 20.0°C | |
| AUG 9 | 19.4°C | 20.0°C | |
| AUG 10 | 19.4°C | 20.0°C | |
| AUG 11 | 19.4°C | 20.0°C | |
| AUG 12 | 20.0°C | 18.9°C | |
| AUG 13 | 20.0°C | 18.9°C | |
| AUG 14 | 20.0°C | 19.0°C | |
| AUG 15 | 20.0°C | 19.0°C | |
| AUG 16 | 20.0°C | 19.1°C | |
| AUG 17 | 20.0°C | 19.2°C | |
| AUG 18 | 20.0°C | 19.2°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 | 3°C | 6°C |
| April | 1°C | 5°C | 8°C |
| May | 5°C | 11°C | 17°C |
| June | 12°C | 18°C | 23°C |
| July | 13°C | 19°C | 24°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 |
Lahnajärvi: Water Temperature by Location
Lahnajärvi: Weather Forecast
August 12
August 13
August 14
Location & Local Information
Lahnajärvi is a small, relatively shallow lake in the Southwest Finland region, historically known as a popular roadside rest area on the old Helsinki-Turku highway. Swimming is generally permitted along its shores and at designated public access points, a right secured by Finland's Everyman’s Rights. This principle grants the public the freedom to use natural water bodies for recreational use. Given its location and history as a leisure stop, the lake has accessible shores and a monitored swimming area. Water quality is maintained and checked by local authorities, ensuring it remains safe and hygienic for bathing during the summer season.
As a small, sheltered lake, Lahnajärvi is prone to heating up rapidly during warm weather but also cools down quickly. During the winter, typically from December to April, the lake is reliably frozen, with water temperatures beneath the ice layer consistently resting between 0∘C and 4∘C. The season for comfortable surface swimming is short, peaking in July. During this mid-summer month, surface temperatures in the shallow nearshore areas often range from 19∘C to 23∘C, sometimes climbing higher in exceptionally warm weather, making it one of the warmer swimming locations in the region. Outside of the brief summer peak, the water is too cool for casual swimming.