Fonte Cerne Reservoir — Current Water Temperature, Annual Trends and Forecast

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

Covão dos Conchos Lake, Portugal © By larahcv, CC0

Current Water Temperature

24.6°C

Today

24.9°C

Yesterday

24.0°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 Fonte Cerne Reservoir today is 24.6°C.

Water Temperature: Daily Trends, Historical Records, and Forecast

✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 June 21 to July 22

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
JUL 15	24.0°C	28.3°C
JUL 16	24.0°C	28.3°C
JUL 17	23.9°C	28.3°C
JUL 18	24.8°C	28.3°C
JUL 19	24.9°C	28.3°C
JUL 20	24.9°C	28.3°C
JUL 21	24.9°C	28.3°C
JUL 22	24.7°C	28.3°C
JUL 23		28.3°C	24.8°C
JUL 24		28.3°C	25.0°C
JUL 25		28.3°C	25.2°C
JUL 26		28.3°C	25.3°C
JUL 27		28.3°C	25.5°C
JUL 28		28.3°C	25.7°C
JUL 29		28.3°C	25.9°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	10°C	14°C	18°C
March	12°C	17°C	20°C
April	14°C	19°C	22°C
May	16°C	22°C	28°C
June	19°C	27°C	34°C
July	22°C	28°C	34°C
August	26°C	32°C	34°C
September	26°C	32°C	34°C
October	17°C	21°C	24°C
November	13°C	18°C	21°C
December	10°C	13°C	15°C

Fonte Cerne Reservoir: Water Temperature by Location

🇵🇹 Portugal > Setúbal District

Fonte Cerne Reservoir: Weather Forecast

July 23

° / °

overcast

rain: 0% | wind:

July 24

° / °

partly cloudy

rain: 0% | wind:

July 25

° / °

partly cloudy

rain: 0% | wind:

July 26

° / °

mainly clear

rain: 0% | wind:

July 27

° / °

fog

rain: 0% | wind:

Location & Local Information

The lake of Albufeira da Barragem de Fonte Cerne, in the Setúbal District, typically shows marked seasonal variation in surface temperature. In summer months the water commonly warms to around 22–26 °C (72–79 °F) on calm, sunny days, while spring and autumn temperatures are often in the 14–20 °C (57–68 °F) range. In winter the surface can drop to roughly 8–13 °C (46–55 °F). These values vary with recent weather, depth, inflows and wind: shallower, sheltered bays warm more quickly, while deeper or fast-flowing areas stay cooler. Diurnal and weather-related swings can also produce several degrees of difference between morning and afternoon readings.

Swimming at reservoir lakes such as Albufeira da Barragem de Fonte Cerne is influenced by both safety and management considerations. Many reservoirs are managed primarily for water supply, irrigation or flood control and therefore have restrictions or recommendations against bathing because of variable depths, submerged structures, sudden currents near outlets, and concerns about water quality. In practice, informal swimming may occur where access is easy and signage permits it, but official rules and local notices should be checked before entering the water. Even where allowed, colder seasonal temperatures and limited lifeguard provision make caution advisable.

Nearby Lakes

Frequently Asked Questions

What is the current water temperature in Fonte Cerne Reservoir?

Water Temperature in Fonte Cerne Reservoir today is 24.6°C.

What is the water temperature in Fonte Cerne Reservoir during the summer months?

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

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

Yes — people can swim in the Fonte Cerne Reservoir, but there are no formal, supervised bathing facilities, so swimming is done informally from safe banks or sheltered inlets while observing local signage, water quality, boat traffic and any temporary restrictions.