Viegas Reservoir — Current Water Temperature, Annual Trends and Forecast

Current Water Temperature

Water Temperature in Viegas Reservoir today is 26.5°C.

Viegas Reservoir: Water Temperature by Location

Viegas Reservoir: Weather Forecast

Location & Local Information

The lake known locally as Albufeira da Barragem do Viegas (Albufeira da Barragem do Viegas) lies in the Beja District within the Alentejo region, where seasonal air temperatures influence surface water temperature. In winter months the reservoir’s surface typically ranges from about 10–14 °C (50–57 °F). Spring brings gradual warming to roughly 13–20 °C (55–68 °F), while summer can see surface values commonly between 20–26 °C (68–79 °F), occasionally reaching the upper 20s °C (low 80s °F) during prolonged heat. Autumn cooling is generally between 15–22 °C (59–72 °F) as the lake responds to changing air temperatures and inflow patterns.

Swimming at Albufeira da Barragem do Viegas is subject to local rules and practical considerations rather than a simple yes or no. Many reservoirs in Portugal are primarily managed for water supply, irrigation and ecological purposes, so bathing can be restricted by authorities to protect water quality and for safety—hidden currents, submerged structures and variable depths can pose risks. Where swimming is observed, it is most common in warmer months when temperatures are more comfortable. Visitors should heed posted signage and local regulations and consider seasonal water quality and safety conditions before entering the water.

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