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 13.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| SEP 13 | 14.1°C | 14.0°C | |
| SEP 14 | 13.9°C | 14.0°C | |
| SEP 15 | 13.9°C | 14.0°C | |
| SEP 16 | 14.1°C | 14.0°C | |
| SEP 17 | 13.6°C | 14.0°C | |
| SEP 18 | 12.7°C | 14.0°C | |
| SEP 19 | 13.7°C | 14.0°C | |
| SEP 20 | 12.9°C | 14.0°C | |
| SEP 21 | 14.0°C | 13.2°C | |
| SEP 22 | 14.0°C | 13.3°C | |
| SEP 23 | 14.0°C | 13.3°C | |
| SEP 24 | 14.0°C | 13.4°C | |
| SEP 25 | 14.0°C | 13.4°C | |
| SEP 26 | 14.0°C | 13.4°C | |
| SEP 27 | 14.0°C | 13.5°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
September 21
September 22
September 23
September 24
September 25
September 26
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.