Lago do Viriato — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lago do Viriato, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lago do Viriato today is 17.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 4 | 17.0°C | 22.0°C | |
| AUG 5 | 17.0°C | 22.0°C | |
| AUG 6 | 17.4°C | 22.0°C | |
| AUG 7 | 17.3°C | 22.0°C | |
| AUG 8 | 17.3°C | 22.0°C | |
| AUG 9 | 17.3°C | 22.0°C | |
| AUG 10 | 17.8°C | 22.0°C | |
| AUG 11 | 17.8°C | 22.0°C | |
| AUG 12 | 22.0°C | 18.0°C | |
| AUG 13 | 22.0°C | 18.2°C | |
| AUG 14 | 22.0°C | 18.4°C | |
| AUG 15 | 22.0°C | 18.6°C | |
| AUG 16 | 22.0°C | 18.9°C | |
| AUG 17 | 22.0°C | 19.1°C | |
| AUG 18 | 22.0°C | 19.3°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 | 3°C | 6°C |
| February | 1°C | 5°C | 8°C |
| March | 2°C | 6°C | 9°C |
| April | 4°C | 8°C | 13°C |
| May | 8°C | 14°C | 19°C |
| June | 11°C | 20°C | 28°C |
| July | 14°C | 20°C | 26°C |
| August | 17°C | 22°C | 27°C |
| September | 14°C | 20°C | 25°C |
| October | 8°C | 12°C | 15°C |
| November | 3°C | 7°C | 11°C |
| December | 0°C | 5°C | 9°C |
Lago do Viriato: Water Temperature by Location
Lago do Viriato: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Lago do Viriato, in the Castelo Branco District of Portugal, typically shows seasonal variation in surface water temperature that reflects the region’s continental-influenced climate. During winter months, surface temperatures often sit between about 6–12 °C (43–54 °F). In spring the lake warms to roughly 12–18 °C (54–64 °F) as days lengthen, while summer can bring the warmest conditions with surface readings commonly in the 20–26 °C range (68–79 °F). By autumn temperatures decline again to roughly 14–20 °C (57–68 °F). These values are approximate averages for a small inland reservoir or natural lake and can vary with depth, recent weather, inflow, and shading.
Swimming at Lago do Viriato is possible and is commonly practiced in the warmer months, primarily because the freshwater and accessible shoreline make it suitable for recreational bathing when temperatures are comfortable. However, whether swimming is formally allowed depends on local management, posted signage, and seasonal water quality; authorities may restrict access during algal blooms, low water or safety concerns. Visitors should check local notices for bathing permissions, be aware that lifeguards are typically not present, and consider cooler temperatures outside peak summer when hypothermia risk and reduced comfort increase.