Santarem — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Santarem, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Santarem today is 19.9°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 | 18.9°C | 20.0°C | |
| JUN 24 | 19.4°C | 20.0°C | |
| JUN 25 | 19.4°C | 20.0°C | |
| JUN 26 | 19.5°C | 20.0°C | |
| JUN 27 | 19.3°C | 20.0°C | |
| JUN 28 | 19.5°C | 20.0°C | |
| JUN 29 | 19.5°C | 20.0°C | |
| JUN 30 | 19.6°C | 20.0°C | |
| JUL 1 | 23.0°C | 20.1°C | |
| JUL 2 | 23.0°C | 20.2°C | |
| JUL 3 | 23.0°C | 20.4°C | |
| JUL 4 | 23.0°C | 20.5°C | |
| JUL 5 | 23.0°C | 20.7°C | |
| JUL 6 | 23.0°C | 20.8°C | |
| JUL 7 | 23.0°C | 21.0°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 | 6°C | 9°C | 12°C |
| February | 6°C | 9°C | 13°C |
| March | 9°C | 12°C | 15°C |
| April | 9°C | 13°C | 17°C |
| May | 10°C | 15°C | 20°C |
| June | 16°C | 20°C | 25°C |
| July | 18°C | 23°C | 27°C |
| August | 18°C | 23°C | 27°C |
| September | 18°C | 22°C | 27°C |
| October | 14°C | 18°C | 20°C |
| November | 11°C | 15°C | 18°C |
| December | 8°C | 11°C | 15°C |
Santarem: Weather Forecast
July 1
July 2
July 3
July 4
Location & Local Information
Santarém, located in central Portugal, stands on a hill overlooking the Tagus River (Rio Tejo), one of the most important waterways of the Iberian Peninsula. The region has a Mediterranean climate with hot, dry summers and mild winters, which strongly influence the river’s water temperature. During winter, the Tagus near Santarém usually measures between 8 and 11 °C, while in spring it warms to around 13–17 °C. In summer, the water can reach 22–26 °C, especially in slower sections and near the banks, offering relatively pleasant conditions for water recreation. In autumn, the temperature decreases again to about 14–18 °C as rainfall increases and sunlight lessens.
Swimming in the Tagus around Santarém is possible but not commonly practiced within the urban area due to the strong current and variable water quality. However, there are nearby rural sections and river beaches upstream that offer safe and accessible spots for bathing during summer. Local authorities monitor the water in some of these areas, ensuring that it meets bathing standards. Despite this, the Tagus in Santarém is appreciated more for its landscape value, fishing, and riverside walks than for swimming. It remains a key natural and cultural feature of the region.