Barragem de Alqueva Lake — Current Water Temperature, Annual Trends and Forecast

This page provides information on the current water temperature in Barragem de Alqueva Lake, trends, monthly ranges and the forecast for the coming days.

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

Current Water Temperature

20.2°C

Today

20.4°C

Yesterday

22.9°C

A Week Ago

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

Water Temperature in Barragem de Alqueva Lake today is 20.2°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

From May 10 to June 10

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
JUN 2	21.5°C	25.0°C
JUN 3	21.1°C	25.0°C
JUN 4	21.1°C	25.0°C
JUN 5	21.1°C	25.0°C
JUN 6	21.1°C	25.0°C
JUN 7	20.4°C	25.0°C
JUN 8	20.2°C	25.0°C
JUN 10		25.0°C	20.4°C
JUN 11		25.0°C	20.7°C
JUN 12		25.0°C	20.9°C
JUN 13		25.0°C	21.2°C
JUN 14		25.0°C	21.4°C
JUN 15		25.0°C	21.6°C
JUN 16		25.0°C	21.9°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	7°C	11°C	14°C
February	7°C	11°C	15°C
March	7°C	12°C	17°C
April	11°C	15°C	20°C
May	16°C	21°C	26°C
June	20°C	25°C	30°C
July	22°C	27°C	33°C
August	23°C	28°C	34°C
September	21°C	26°C	32°C
October	14°C	19°C	22°C
November	11°C	15°C	19°C
December	9°C	14°C	17°C

Barragem de Alqueva Lake: Water Temperature by Location

🇵🇹 Portugal > Beja District

🇵🇹 Portugal > Évora District

Mourão20.6°C

Barragem de Alqueva Lake: Weather Forecast

June 9

° / °

mainly clear

rain: 0% | wind:

June 10

° / °

clear sky

rain: 0% | wind:

June 11

° / °

clear sky

rain: 0% | wind:

June 12

° / °

overcast

rain: 9% | wind:

June 13

° / °

partly cloudy

rain: 10% | wind:

June 14

° / °

overcast

rain: 12% | wind:

Location & Local Information

The reservoir known in Portuguese as Barragem de Alqueva is a large artificial lake in the Beja District whose surface water temperatures vary with the Mediterranean climate of the region. In summer months (June–August) surface temperatures commonly range from about 22–28 °C (72–82 °F), with the warmest conditions during heatwaves. Spring (March–May) temperatures are typically cooler, roughly 15–20 °C (59–68 °F), while autumn (September–November) often sees milder water around 18–22 °C (64–72 °F). In winter (December–February) the reservoir cools to approximately 10–14 °C (50–57 °F) at the surface; deeper water remains colder year-round. Local variations occur depending on depth, wind and recent weather, so readings at particular inlets or marinas can differ from general values.

Swimming in and around Barragem de Alqueva is possible and commonly practiced, especially in the designated bathing areas and along accessible shores during the summer season. Authorities and landowners may restrict swimming in certain zones because of boat traffic, steep banks, variable depths and safety concerns, and water quality is monitored at official beaches rather than across the whole reservoir. Visitors are advised to swim only in marked or supervised spots when available, to be aware of boats and sudden depth changes, and to check local guidance on water quality and permitted activities before entering the water.

Nearby Lakes

Frequently Asked Questions

What is the current water temperature in Barragem de Alqueva Lake?

Water Temperature in Barragem de Alqueva Lake today is 20.2°C.

What is the water temperature in Barragem de Alqueva Lake during the summer months?

The water temperature in Barragem de Alqueva Lake in summer fluctuates in the range of 20°C - 34°C.

Is it possible to swim in Barragem de Alqueva (Portugal) and what are the possibilities for this?

Yes — you can swim in Barragem de Alqueva: although there are few official lifeguarded beaches, many sheltered coves, lakeshore spots and marinas allow swimming and you can also reach the water from boats or via local operators offering kayaking, paddleboarding and guided trips, but always heed local signs, check water quality and conditions and take normal safety precautions.