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

26.4°C

Today

27.4°C

Yesterday

27.3°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 26.4°C.

Water Temperature: Daily Trends, Historical Records, and Forecast

✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 August 21 to September 21

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
SEP 14	27.3°C	28.5°C
SEP 15	27.6°C	28.5°C
SEP 16	27.8°C	28.5°C
SEP 17	27.7°C	28.5°C
SEP 18	27.3°C	28.5°C
SEP 19	27.4°C	28.5°C
SEP 20	27.0°C	28.5°C
SEP 22		28.5°C	26.5°C
SEP 23		28.5°C	26.6°C
SEP 24		28.5°C	26.7°C
SEP 25		28.5°C	26.8°C
SEP 26		28.5°C	26.9°C
SEP 27		28.5°C	27.0°C
SEP 28		28.5°C	27.1°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	23°C	29°C	34°C
September	23°C	29°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

September 21

° / °

mainly clear

rain: 0% | wind:

September 22

° / °

clear sky

rain: 0% | wind:

September 23

° / °

clear sky

rain: 0% | wind:

September 24

° / °

clear sky

rain: 0% | wind:

September 25

° / °

overcast

rain: 0% | wind:

September 26

° / °

overcast

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 26.4°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.