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 18.3°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 |
|---|---|---|---|
| JUL 21 | 20.0°C | 15.6°C | |
| JUL 22 | 19.8°C | 15.6°C | |
| JUL 23 | 18.3°C | 15.6°C | |
| JUL 24 | 18.0°C | 15.6°C | |
| JUL 25 | 18.1°C | 15.6°C | |
| JUL 26 | 18.2°C | 15.6°C | |
| JUL 27 | 18.3°C | 15.6°C | |
| JUL 28 | 18.2°C | 15.6°C | |
| JUL 29 | 15.6°C | 18.2°C | |
| JUL 30 | 15.6°C | 18.2°C | |
| JUL 31 | 15.6°C | 18.1°C | |
| AUG 1 | 17.0°C | 18.0°C | |
| AUG 2 | 17.0°C | 18.0°C | |
| AUG 3 | 17.0°C | 17.9°C | |
| AUG 4 | 17.0°C | 17.8°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
July 29
July 30
July 31
August 1
August 2
August 3
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.