Kotka — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Kotka, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Kotka today is 18.4°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 | 20.2°C | 17.0°C | |
| AUG 5 | 20.0°C | 17.0°C | |
| AUG 6 | 19.9°C | 17.0°C | |
| AUG 7 | 19.9°C | 17.0°C | |
| AUG 8 | 19.5°C | 17.0°C | |
| AUG 9 | 19.2°C | 17.0°C | |
| AUG 10 | 19.1°C | 17.0°C | |
| AUG 11 | 19.1°C | 17.0°C | |
| AUG 12 | 17.0°C | 18.3°C | |
| AUG 13 | 17.0°C | 18.3°C | |
| AUG 14 | 17.0°C | 18.2°C | |
| AUG 15 | 17.0°C | 18.1°C | |
| AUG 16 | 17.0°C | 18.1°C | |
| AUG 17 | 17.0°C | 18.0°C | |
| AUG 18 | 17.0°C | 17.9°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 | 1°C | 4°C |
| February | 0°C | 1°C | 4°C |
| March | 0°C | 2°C | 5°C |
| April | 0°C | 4°C | 7°C |
| May | 5°C | 9°C | 14°C |
| June | 10°C | 15°C | 19°C |
| July | 11°C | 16°C | 22°C |
| August | 12°C | 17°C | 21°C |
| September | 9°C | 14°C | 18°C |
| October | 4°C | 8°C | 10°C |
| November | 0°C | 4°C | 7°C |
| December | 0°C | 2°C | 5°C |
Kotka: Weather Forecast
August 12
August 13
August 14
Location & Local Information
Kotka, located in the Kymenlaakso region of southeastern Finland, lies at the mouth of the Kymijoki River, where freshwater meets the Gulf of Finland. The river’s water temperature changes with the seasons, influenced by both inland flows and the nearby sea. In spring, after the ice melts, the surface water in Kymijoki is usually around 4–8 °C (39–46 °F). During early summer, it rises to about 15–18 °C (59–64 °F), and in July, when the weather is warmest, the temperature typically reaches 18–22 °C (64–72 °F). Shallow sections of the river can occasionally warm to 23–24 °C (73–75 °F). As autumn arrives, the water cools quickly below 10 °C (50 °F), and during winter, upper parts of the river may freeze, while the lower parts near Kotka remain mostly ice-free.
Swimming in the Kymijoki River near Kotka is allowed but best enjoyed in designated and calm areas because of the strong currents in some sections. The water quality is generally good, and there are nearby beaches where people can safely swim during summer. The river and surrounding parks also attract visitors for boating and fishing. In July and August, the water is warm enough for comfortable swimming, offering a refreshing contrast to the sea breeze from the coast.