Pego Altar Reservoir — Current Water Temperature, Annual Trends and Forecast

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

Covão dos Conchos Lake, Portugal © By larahcv, CC0

Current Water Temperature

19.4°C

Today

19.6°C

Yesterday

21.4°C

A Week Ago

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Water Temperature in Pego Altar Reservoir today is 19.4°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 May 9 to June 9

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
JUN 2	21.0°C	24.8°C
JUN 3	20.3°C	24.8°C
JUN 4	20.3°C	24.8°C
JUN 5	20.3°C	24.8°C
JUN 6	20.2°C	24.8°C
JUN 7	19.6°C	24.8°C
JUN 8	19.4°C	24.8°C
JUN 10		24.8°C	19.7°C
JUN 11		24.8°C	19.9°C
JUN 12		24.8°C	20.2°C
JUN 13		24.8°C	20.5°C
JUN 14		24.8°C	20.8°C
JUN 15		24.8°C	21.0°C
JUN 16		24.8°C	21.3°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	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	19°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	12°C	15°C

Pego Altar Reservoir: Water Temperature by Location

🇵🇹 Portugal > Setúbal District

Pego Altar Reservoir: Weather Forecast

June 9

° / °

partly cloudy

rain: 0% | wind:

June 10

° / °

clear sky

rain: 0% | wind:

June 11

° / °

clear sky

rain: 3% | wind:

June 12

° / °

overcast

rain: 5% | wind:

June 13

° / °

slight rain showers

rain: 15% | wind:

June 14

° / °

slight rain showers

rain: 22% | wind:

Location & Local Information

The Albufeira da Barragem do Pego do Altar, in Setúbal District, is a man-made reservoir whose water temperatures follow the Mediterranean-influenced seasonal cycle of southern Portugal. In winter the surface temperature commonly ranges from about 10–14 °C (50–57 °F), while spring sees a gradual rise to roughly 14–20 °C (57–68 °F). Summer warming typically brings surface values into the 20–26 °C range (68–79 °F), with occasional heat-wave spikes toward 27–28 °C (81–82 °F). In autumn the lake cools again to around 15–22 °C (59–72 °F). Deeper water layers remain markedly cooler year-round, so overall conditions depend on location in the reservoir, wind, sun exposure and recent weather.

Swimming in the Albufeira da Barragem do Pego do Altar is possible in many spots, but it is often informal and subject to local rules. Some areas may be restricted because the reservoir is used for irrigation or water supply, and there are safety concerns such as sudden releases, submerged obstacles and the absence of lifeguards. Water quality can vary with season and rainfall, so local signage and municipal guidance should be consulted before entering the water. In short, bathing is feasible during warmer months when surface temperatures are comfortable, but it should be undertaken with caution and awareness of any official prohibitions.

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Frequently Asked Questions

What is the current water temperature in Pego Altar Reservoir?

Water Temperature in Pego Altar Reservoir today is 19.4°C.

What is the water temperature in Pego Altar Reservoir during the summer months?

The water temperature in Pego Altar Reservoir in summer fluctuates in the range of 19°C - 34°C.

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

Yes — people do swim at Pego Altar Reservoir, mainly as informal wild swimming from the shore or small beaches and alongside non‑motorized activities like kayaking, paddleboarding or boating, but facilities, water quality and any local restrictions can vary so it's wise to check signage and take usual safety precautions.