Porto — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Porto, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Porto today is 19.3°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 |
|---|---|---|---|
| JUN 23 | 18.3°C | 19.0°C | |
| JUN 24 | 19.4°C | 19.0°C | |
| JUN 25 | 19.4°C | 19.0°C | |
| JUN 26 | 19.5°C | 19.0°C | |
| JUN 27 | 19.5°C | 19.0°C | |
| JUN 28 | 18.9°C | 19.0°C | |
| JUN 29 | 18.9°C | 19.0°C | |
| JUN 30 | 19.0°C | 19.0°C | |
| JUL 1 | 21.0°C | 19.4°C | |
| JUL 2 | 21.0°C | 19.5°C | |
| JUL 3 | 21.0°C | 19.6°C | |
| JUL 4 | 21.0°C | 19.6°C | |
| JUL 5 | 21.0°C | 19.7°C | |
| JUL 6 | 21.0°C | 19.8°C | |
| JUL 7 | 21.0°C | 19.9°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 | 5°C | 9°C | 11°C |
| February | 5°C | 8°C | 12°C |
| March | 8°C | 11°C | 14°C |
| April | 10°C | 14°C | 17°C |
| May | 13°C | 18°C | 22°C |
| June | 15°C | 19°C | 24°C |
| July | 17°C | 21°C | 26°C |
| August | 18°C | 22°C | 27°C |
| September | 15°C | 19°C | 24°C |
| October | 12°C | 16°C | 18°C |
| November | 9°C | 13°C | 16°C |
| December | 5°C | 9°C | 13°C |
Porto: Weather Forecast
July 1
July 2
July 3
July 4
Location & Local Information
In the Grande Porto area, natural standing waters such as small urban lakes and sheltered river sections along the Douro present modestly cool temperatures compared with nearby Atlantic beaches. Typical seasonal surface temperatures for lakes and calm river stretches run roughly 6–12 °C (43–54 °F) in winter and spring, 16–22 °C (61–72 °F) in summer, and back toward 8–14 °C (46–57 °F) in autumn. During heat waves shallow lagoons or sheltered pockets can rise toward the mid-20s °C (around 75–78 °F), but deeper or flowing parts of the Douro stay noticeably cooler. Water temperature varies with depth, river flow, recent rainfall and local sheltering from wind.
Swimming opportunities depend on location and regulation. Many small park lakes in Greater Porto formally prohibit bathing for safety and water-quality reasons, while some calmer Douro embayments and managed inland reservoirs permit swimming where signage, water-quality monitoring and lifeguards are present. In central Porto swimming in the Douro near quays is generally discouraged because of currents, boat traffic and pollution risks, so most residents use monitored beaches on the coast or organized inland sites in summer when conditions and official permissions make bathing safe. Always check local signage and recent water-quality information before entering.