Caia Reservoir — Current Water Temperature, Annual Trends and Forecast

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

Arrocampo Reservoir, Spain © By CNA, CC BY-SA 3.0

Current Water Temperature

21.6°C

Today

21.6°C

Yesterday

23.1°C

A Week Ago

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Water Temperature in Caia Reservoir today is 21.6°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 September 16 to October 17

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
OCT 10	23.1°C	20.0°C
OCT 11	22.7°C	20.0°C
OCT 12	22.5°C	20.0°C
OCT 13	22.3°C	20.0°C
OCT 14	21.7°C	20.0°C
OCT 15	21.3°C	20.0°C
OCT 16	21.6°C	20.0°C
OCT 17	21.6°C	20.0°C
OCT 18		20.0°C	21.5°C
OCT 19		20.0°C	21.4°C
OCT 20		20.0°C	21.4°C
OCT 21		20.0°C	21.3°C
OCT 22		20.0°C	21.2°C
OCT 23		20.0°C	21.1°C
OCT 24		20.0°C	21.0°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	6°C	10°C	13°C
February	6°C	10°C	14°C
March	9°C	13°C	17°C
April	10°C	14°C	19°C
May	11°C	17°C	23°C
June	18°C	23°C	28°C
July	21°C	26°C	32°C
August	21°C	26°C	32°C
September	20°C	25°C	30°C
October	16°C	20°C	23°C
November	10°C	16°C	20°C
December	8°C	12°C	15°C

Caia Reservoir: Water Temperature by Location

🇵🇹 Portugal > Portalegre District

Caia Reservoir: Weather Forecast

October 18

° / °

slight thunderstorm

rain: 43% | wind:

October 19

° / °

overcast

rain: 15% | wind:

October 20

° / °

overcast

rain: 18% | wind:

October 21

° / °

mainly clear

rain: 10% | wind:

October 22

° / °

overcast

rain: 3% | wind:

Location & Local Information

The Albufeira da Barragem do Caia, a reservoir in Portalegre District, shows the typical thermal behavior of inland Iberian reservoirs. Surface water temperature in summer commonly ranges from about 20–26 °C (68–79 °F), with the warmest, shallow bays occasionally reaching the upper end on hot, calm days. In spring and autumn temperatures are more moderate, roughly 12–18 °C (54–64 °F) in spring and 14–20 °C (57–68 °F) in autumn as the lake warms or cools. Winter surface temperatures tend to be noticeably cooler, often around 8–12 °C (46–54 °F). These figures vary with recent weather, reservoir level and depth: deeper water remains colder year-round and thermal stratification can keep bottom layers several degrees cooler than the surface.

Swimming at the Albufeira da Barragem do Caia is commonly practiced but is not universally regulated as a supervised bathing area, so whether it is allowed can depend on local rules and signage. Restrictions may be in place where the reservoir serves water supply, where water quality is monitored, or where safety hazards—such as steep banks, fluctuating water levels and submerged obstacles—exist. People who choose to swim do so at their own risk and should heed posted regulations, avoid restricted zones, and consider the seasonal water temperatures and lack of lifeguards when deciding to enter the water.

Nearby Lakes

Frequently Asked Questions

What is the current water temperature in Caia Reservoir?

Water Temperature in Caia Reservoir today is 21.6°C.

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

The water temperature in Caia Reservoir in summer fluctuates in the range of 18°C - 32°C.

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

Swimming is possible at the Caia Reservoir in Portugal in suitable, non‑restricted spots and is often paired with activities like bathing, kayaking/canoeing and shore fishing, but availability depends on local rules, water quality and safety conditions so visitors should follow signage and municipal guidance.