Montargil Reservoir — Current Water Temperature, Annual Trends and Forecast

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

Covão dos Conchos Lake, Portugal © By larahcv, CC0

Current Water Temperature

19.0°C

Today

19.4°C

Yesterday

21.9°C

A Week Ago

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Water Temperature in Montargil Reservoir today is 19°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	21.3°C	24.0°C
JUN 3	20.1°C	24.0°C
JUN 4	19.9°C	24.0°C
JUN 5	19.9°C	24.0°C
JUN 6	19.9°C	24.0°C
JUN 7	19.4°C	24.0°C
JUN 8	19.1°C	24.0°C
JUN 10		24.0°C	19.3°C
JUN 11		24.0°C	19.5°C
JUN 12		24.0°C	19.8°C
JUN 13		24.0°C	20.0°C
JUN 14		24.0°C	20.3°C
JUN 15		24.0°C	20.5°C
JUN 16		24.0°C	20.8°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	10°C	14°C	18°C
April	11°C	15°C	20°C
May	12°C	18°C	23°C
June	19°C	24°C	29°C
July	22°C	27°C	33°C
August	22°C	27°C	33°C
September	21°C	26°C	32°C
October	17°C	21°C	24°C
November	11°C	17°C	21°C
December	9°C	12°C	15°C

Montargil Reservoir: Water Temperature by Location

🇵🇹 Portugal > Portalegre District

Montargil 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 de Montargil, a reservoir in the Portalegre district, experiences marked seasonal variation in surface water temperature. In winter the surface typically cools to about 10–14 °C (50–57 °F), while spring sees a rise into the mid-teens, roughly 14–20 °C (57–68 °F). Summer surface temperatures are warmest, commonly ranging from about 20–28 °C (68–82 °F) on sunny days, though shallow bays can occasionally warm a few degrees higher. In autumn the water generally falls back to around 15–22 °C (59–72 °F). Actual temperatures depend on recent weather, wind, inflows from tributaries and depth: deeper or shaded areas remain cooler than shallow, sun-exposed zones.

Swimming in the Montargil reservoir is a typical recreational activity and is often permitted, particularly in designated bathing spots and near river beaches that are monitored seasonally. The calm waters and relatively high summer temperatures make it attractive for bathing and water sports, but local rules may apply and access can be restricted for safety or water-quality reasons, such as algal blooms, boating zones, or fluctuating dam levels. Visitors are advised to use marked swimming areas, heed local signs and lifeguards where present, and be aware that temperatures drop rapidly outside summer months, affecting comfort and safety.

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Frequently Asked Questions

What is the current water temperature in Montargil Reservoir?

Water Temperature in Montargil Reservoir today is 19°C.

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

The water temperature in Montargil Reservoir in summer fluctuates in the range of 19°C - 33°C.

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

Yes — swimming is possible in Montargil Reservoir: visitors can bathe from small sandy or grassy shores near campsites and marinas, do open-water swims in the calm water, or join supervised activities and water sports such as kayaking, stand‑up paddleboarding and boat excursions, though facilities, seasonal water quality and safety rules vary so follow local guidance.