Viegas Reservoir — Current Water Temperature, Annual Trends and Forecast

This page provides information on the current water temperature in Viegas Reservoir, trends, monthly ranges and the forecast for the coming days.

Bornos Reservoir, Spain © By El Pantera, CC BY-SA 4.0

Current Water Temperature

19.1°C

Today

19.4°C

Yesterday

20.4°C

A Week Ago

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Water Temperature in Viegas Reservoir today is 19.1°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

From September 30 to October 31

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
OCT 24	20.4°C	20.0°C
OCT 25	20.3°C	20.0°C
OCT 26	20.1°C	20.0°C
OCT 27	19.4°C	20.0°C
OCT 28	19.7°C	20.0°C
OCT 29	19.1°C	20.0°C
OCT 30	19.4°C	20.0°C
OCT 31	19.2°C	20.0°C
NOV 1		15.9°C	18.9°C
NOV 2		15.9°C	18.8°C
NOV 3		15.9°C	18.6°C
NOV 4		15.9°C	18.5°C
NOV 5		15.9°C	18.3°C
NOV 6		15.9°C	18.1°C
NOV 7		15.9°C	18.0°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	10°C	13°C
February	9°C	13°C	17°C
March	11°C	15°C	19°C
April	13°C	18°C	21°C
May	17°C	22°C	27°C
June	20°C	27°C	34°C
July	22°C	28°C	34°C
August	23°C	29°C	34°C
September	23°C	29°C	34°C
October	16°C	20°C	23°C
November	11°C	16°C	20°C
December	9°C	12°C	14°C

Viegas Reservoir: Water Temperature by Location

🇵🇹 Portugal > Beja District

Viegas Reservoir: Weather Forecast

November 1

° / °

fog

rain: 0% | wind:

November 2

° / °

clear sky

rain: 5% | wind:

November 3

° / °

overcast

rain: 5% | wind:

November 4

° / °

overcast

rain: 5% | wind:

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.

Nearby Lakes

Frequently Asked Questions

What is the current water temperature in Viegas Reservoir?

Water Temperature in Viegas Reservoir today is 19.1°C.

What is the water temperature in Viegas Reservoir during the summer months?

The water temperature in Viegas Reservoir in summer fluctuates in the range of 20°C - 34°C.

Is it possible to swim in Viegas Reservoir (Portugal) and what are the possibilities for this?

Yes—people do swim in Viegas Reservoir, typically from its shores or small sandy/pebbly bays and from boats or paddlecraft, but there are no formal lifeguarded bathing facilities so you should check local signage, water quality and any access or safety restrictions before entering.