Helsinki — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Helsinki, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Helsinki today is 17.9°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 | 17.2°C | 19.0°C | |
| AUG 25 | 17.2°C | 19.0°C | |
| AUG 26 | 17.1°C | 19.0°C | |
| AUG 27 | 17.0°C | 19.0°C | |
| AUG 28 | 17.1°C | 19.0°C | |
| AUG 29 | 17.2°C | 19.0°C | |
| AUG 30 | 17.3°C | 19.0°C | |
| AUG 31 | 17.8°C | 19.0°C | |
| SEP 1 | 16.0°C | 17.8°C | |
| SEP 2 | 16.0°C | 17.7°C | |
| SEP 3 | 16.0°C | 17.6°C | |
| SEP 4 | 16.0°C | 17.5°C | |
| SEP 5 | 16.0°C | 17.4°C | |
| SEP 6 | 16.0°C | 17.3°C | |
| SEP 7 | 16.0°C | 17.2°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 | 6°C | 11°C | 16°C |
| June | 12°C | 17°C | 22°C |
| July | 13°C | 18°C | 23°C |
| August | 14°C | 19°C | 24°C |
| September | 11°C | 16°C | 21°C |
| October | 5°C | 9°C | 12°C |
| November | 1°C | 5°C | 9°C |
| December | 0°C | 3°C | 6°C |
Helsinki: Weather Forecast
September 1
September 2
September 3
September 4
Location & Local Information
Helsinki, the capital of Finland, located in the Uusimaa region, is surrounded not only by the sea but also by several inland lakes such as Longinoja, Vantaanjoki, and smaller recreational ponds and reservoirs. These inland water bodies have a more distinct seasonal temperature cycle than the nearby Baltic Sea. After the ice melts in late April or early May, the surface water temperature is around 4–7 °C (39–45 °F). During early summer, it rises to 13–16 °C (55–61 °F), and in July, the warmest month, inland lakes in the Helsinki area typically reach 18–22 °C (64–72 °F). In shallower lakes and ponds, the temperature may briefly exceed 23 °C (73 °F). By late September, the water cools below 10 °C (50 °F), and freezing generally occurs by late November.
Swimming in Helsinki’s inland lakes and rivers is allowed and well-organized, especially in maintained areas such as Vantaanjoki or Tuomarinkylä. Water quality is regularly monitored and generally suitable for bathing. The shallow and calm waters warm faster than the sea, making them pleasant for swimming in summer. While spring and autumn conditions are cold and best suited for experienced swimmers, mid-summer offers comfortable and refreshing temperatures for swimming and outdoor recreation across Helsinki’s natural inland settings.