Porvoo — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Porvoo, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Porvoo today is 4.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges less than 41°F (5°C). Such water is extremely cold and not recommended for swimming without proper preparation. In these conditions, the risk of hypothermia is very high, and prolonged exposure to the water can be hazardous to your health. If you decide to swim, it is important to have the appropriate gear, such as a wetsuit. Typically, only experienced swimmers or those who practice winter swimming venture into such waters. 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 |
|---|---|---|---|
| NOV 4 | 5.8°C | 3.6°C | |
| NOV 5 | 5.4°C | 3.6°C | |
| NOV 6 | 4.8°C | 3.6°C | |
| NOV 7 | 5.1°C | 3.6°C | |
| NOV 8 | 4.6°C | 3.6°C | |
| NOV 9 | 4.2°C | 3.6°C | |
| NOV 10 | 4.2°C | 3.6°C | |
| NOV 11 | 4.4°C | 3.6°C | |
| NOV 12 | 3.6°C | 4.3°C | |
| NOV 13 | 3.6°C | 4.2°C | |
| NOV 14 | 3.6°C | 4.2°C | |
| NOV 15 | 3.6°C | 4.2°C | |
| NOV 16 | 3.6°C | 4.1°C | |
| NOV 17 | 3.6°C | 4.1°C | |
| NOV 18 | 3.6°C | 4.1°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 | 4°C | 9°C | 14°C |
| June | 10°C | 15°C | 19°C |
| July | 11°C | 16°C | 21°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 |
Porvoo: Weather Forecast
November 12
November 13
November 14
November 15
November 16
November 17
Location & Local Information
Porvoo, located in the Uusimaa region of southern Finland, is built along the Porvoonjoki River, which flows through the historic old town before reaching the sea. The river’s shallow nature and slow flow mean that its water temperature changes noticeably with the seasons. After the ice melts in late April or early May, the surface water is typically around 4–8 °C (39–46 °F). During early summer, the river warms to 13–16 °C (55–61 °F), and in July, the warmest month, temperatures usually reach 18–22 °C (64–72 °F). In calm, sunny periods, the water can temporarily exceed 23 °C (73 °F). By late September, temperatures drop below 10 °C (50 °F), and the river cools rapidly before winter ice forms in November.
Swimming in the Porvoonjoki River is allowed but generally limited to designated areas due to varying currents and water depth. The water quality is usually suitable for bathing, especially near recreational spots away from the estuary. Locals often swim during the warm summer months, when conditions are safe and pleasant. Spring and autumn waters remain cold, making swimming less common, but midsummer offers comfortable temperatures and scenic surroundings, ideal for enjoying Porvoo’s blend of nature and historic charm.