Nabão River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Nabão River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Nabão River today is 20.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| AUG 24 | 22.6°C | 23.0°C | |
| AUG 25 | 22.6°C | 23.0°C | |
| AUG 26 | 22.6°C | 23.0°C | |
| AUG 27 | 20.6°C | 23.0°C | |
| AUG 28 | 20.5°C | 23.0°C | |
| AUG 29 | 20.5°C | 23.0°C | |
| AUG 30 | 20.5°C | 23.0°C | |
| AUG 31 | 20.5°C | 23.0°C | |
| SEP 1 | 22.0°C | 20.6°C | |
| SEP 2 | 22.0°C | 20.7°C | |
| SEP 3 | 22.0°C | 20.7°C | |
| SEP 4 | 22.0°C | 20.8°C | |
| SEP 5 | 22.0°C | 20.9°C | |
| SEP 6 | 22.0°C | 21.0°C | |
| SEP 7 | 22.0°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 | 18°C |
| May | 10°C | 15°C | 21°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 | 10°C | 14°C | 18°C |
| December | 8°C | 11°C | 14°C |
Nabão River: Water Temperature by Location
Nabão River: Weather Forecast
September 1
September 2
September 3
September 4
September 5
Location & Local Information
The Rio Nabão, flowing through the Santarém District around Tomar, typically shows marked seasonal variation in water temperature influenced by rainfall, depth and local shading. In winter months (December–February) surface temperatures are generally around 8–12 °C (46–54 °F). Spring (March–May) brings gradual warming to roughly 12–18 °C (54–64 °F). In summer (June–August) shallower, sunlit stretches can reach about 18–25 °C (64–77 °F), though deeper or spring-fed pools remain cooler. Autumn (September–November) commonly sees temperatures recede to roughly 14–19 °C (57–66 °F). These numbers are approximate: short-term weather, upstream flow, and local microclimates can push temperatures outside these ranges.
Swimming occurs in parts of the Nabão, especially where local authorities or communities have identified calmer, accessible stretches for bathing, but it is not uniformly permitted everywhere. Whether swimming is allowed depends on municipal regulations, signage and current water-quality assessments; some urban or constricted sections may be unsafe due to currents, submerged obstacles or pollution. Lifeguard presence and formal monitoring vary by site and season, so swimmers should obey posted notices, check recent water-quality information and be mindful of variable depth and flow. For a safe experience, choose officially designated bathing areas when available and avoid unsupervised or fast-flowing reaches.