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 7.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 41°F (5°C) to 47°F (8°C). This water temperature is still quite low, and swimming in such conditions may only be comfortable for hardened individuals. It is recommended to limit the time spent in the water to avoid hypothermia. For those not accustomed to cold water, it is better to refrain from swimming. However, if you decide to enter the water, it is advisable to wear a warm wetsuit for protection against the cold. 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 |
|---|---|---|---|
| OCT 15 | 8.5°C | 8.0°C | |
| OCT 16 | 8.4°C | 8.0°C | |
| OCT 17 | 8.3°C | 8.0°C | |
| OCT 18 | 9.0°C | 8.0°C | |
| OCT 19 | 8.9°C | 8.0°C | |
| OCT 20 | 8.7°C | 8.0°C | |
| OCT 21 | 7.9°C | 8.0°C | |
| OCT 22 | 7.6°C | 8.0°C | |
| OCT 23 | 8.0°C | 7.6°C | |
| OCT 24 | 8.0°C | 7.6°C | |
| OCT 25 | 8.0°C | 7.7°C | |
| OCT 26 | 8.0°C | 7.7°C | |
| OCT 27 | 8.0°C | 7.7°C | |
| OCT 28 | 8.0°C | 7.7°C | |
| OCT 29 | 8.0°C | 7.7°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
October 23
October 24
October 25
October 26
October 27
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.