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Weather in Cascais for August 2026

Your guide to Cascais weather in August - trends and predictions

    Temperatures

  • In general, the average temperature in Cascais at the beginning of August is 23.1 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 21.4 °C by the end of August.

    • Rain 🌧️

  • Precipitation in Cascais during August is a rare event, with an average of fewer than 2 rainy days.

    • More

  • Is August a good time to visit Cascais? check out the best time to travel to Cascais page.

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Average dry days
31
Dry days
Average rainy days
0
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/18°
Temperatures
Average wind speed
32 km/h
Avg max wind
Average humidity
79 %
Avg humidity

Cascais Weather August

Move between months or click on a day
July
September
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Sunny
23°
2
Patchy rain possible
22°
3
Sunny
23°
4
Sunny
23°
5
Sunny
24°
6
Patchy rain possible
24°
7
Sunny
23°
8
Cloudy
22°
9
Partly cloudy
24°
10
Sunny
24°
11
Sunny
25°
12
Partly cloudy
24°
13
Sunny
23°
14
Sunny
23°
15
Sunny
23°
16
Sunny
24°
17
Sunny
24°
18
Partly cloudy
23°
19
Partly cloudy
23°
20
Patchy rain possible
23°
21
Sunny
23°
22
Patchy rain possible
24°
23
Sunny
24°
24
Sunny
24°
25
Sunny
22°
26
Partly cloudy
22°
27
Sunny
22°
28
Sunny
21°
29
Sunny
21°
30
Sunny
21°
31
Patchy rain possible
21°

Temperatures trend during August in Cascais

See the weather trend as well as the moving average line

August weather in Cascais day by day

Click on a date for more information
July September
Date Weather Temperatures Rain UV More
1 Aug. Sunny
Sunny
 23° /18° 0 mm 6
2 Aug. Patchy rain possible
Patchy rain possible
 22° /18° 0 mm 6
3 Aug. Sunny
Sunny
 23° /18° 0 mm 6
4 Aug. Sunny
Sunny
 23° /18° 0 mm 6
5 Aug. Sunny
Sunny
 24° /18° 0 mm 6
6 Aug. Patchy rain possible
Patchy rain possible
 24° /18° 0.1 mm 6
7 Aug. Sunny
Sunny
 23° /18° 0 mm 6
8 Aug. Cloudy
Cloudy
 22° /18° 0 mm 5
9 Aug. Partly cloudy
Partly cloudy
 24° /18° 0 mm 6
10 Aug. Sunny
Sunny
 24° /18° 0 mm 6
11 Aug. Sunny
Sunny
 25° /18° 0 mm 6
12 Aug. Partly cloudy
Partly cloudy
 24° /18° 0 mm 6
13 Aug. Sunny
Sunny
 23° /18° 0 mm 6
14 Aug. Sunny
Sunny
 23° /17° 0.1 mm 6
15 Aug. Sunny
Sunny
 23° /18° 0 mm 6
16 Aug. Sunny
Sunny
 24° /18° 0 mm 6
17 Aug. Sunny
Sunny
 24° /18° 0 mm 6
18 Aug. Partly cloudy
Partly cloudy
 23° /18° 0 mm 6
19 Aug. Partly cloudy
Partly cloudy
 23° /18° 0 mm 6
20 Aug. Patchy rain possible
Patchy rain possible
 23° /18° 0 mm 6
21 Aug. Sunny
Sunny
 23° /18° 0 mm 6
22 Aug. Patchy rain possible
Patchy rain possible
 24° /18° 0 mm 6
23 Aug. Sunny
Sunny
 24° /18° 0 mm 6
24 Aug. Sunny
Sunny
 24° /18° 0 mm 6
25 Aug. Sunny
Sunny
 22° /17° 0 mm 6
26 Aug. Partly cloudy
Partly cloudy
 22° /17° 0 mm 6
27 Aug. Sunny
Sunny
 22° /17° 0 mm 6
28 Aug. Sunny
Sunny
 21° /17° 0 mm 6
29 Aug. Sunny
Sunny
 21° /18° 0 mm 5
30 Aug. Sunny
Sunny
 21° /18° 0 mm 6
31 Aug. Patchy rain possible
Patchy rain possible
 21° /18° 0.1 mm 5
Next
Important Notice
Our weather forecast for Cascais in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cascais forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Cascais weather in August vs July vs September

Compare August weather in Cascais with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
JulyAugustSeptember
WeatherSunny
Sunny
Sunny
Sunny
Sunny
Sunny
Temperatures23°/18°23°/18°21°/18°
Rainfall2 mm0 mm28 mm
Wind29.4 km/h32 km/h25.1 km/h
Humidity79%79%77%
Rainy days1 days0 days8 days
Dry days30 days31 days22 days

Planning a trip to Cascais? Discover the best time to visit

Cascais in August - FAQ

What are the expected maximum and minimum temperatures in Cascais during August?
During August, expect a variety of temperatures with highs around 23° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Cascais during August?
Rainfall in Cascais during August is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 0 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Cascais during August?
The average wind speed in Cascais during August is 32 km/h, suggesting breezy to windy conditions, depending on your activities.

Cascais water temperatures in August

The average water temperature of the Atlantic Ocean near Cascais in August is 17.1 °C. At the beginning of August temperatures are around 17.4 °C; by the end of the month they get a bit cooler and reach 16.8 °C.

What is the water temperature in Cascais in August?
The average water temperature in Cascais in August is 17.1 °C.
Can you swim in Cascais in August?
Brisk: quick dips and active swimming are fine, but pack a 2–3 mm spring suit if you plan longer sessions or early-morning outings.

What to pack to Cascais in August?

As you prepare for your trip to Cascais in August, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Cascais, during August, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather

UV exposure in Cascais during August

Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️

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Get accurate weather forecasts for Cascais, located at latitude 38.697 and longitude -9.421. Stay updated with localized weather information tailored for Cascais.

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