Cascais Weather in August
August is one of the perfect months to visit Cascais, with daytime temperatures of 22°C (72°F) and lows of 18°C (64°F) at night. Rainfall is minimal, averaging just 5 mm (0.2 in) for the month.
Rainfall in Cascais in August
Expect around 2 days of rain based on historical data, with 5 mm (0.2 in) average. When rain does fall, showers tend to be light and brief. Most days will be dry.
Temperature in Cascais in August
August is one of the better months to visit Cascais. Expect 22°C (72°F) during the day and 18°C (64°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 18°C (64°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping. On average, it has the peak temperatures of the year.
Sunshine in Cascais in August
The city usually sees around 355 hours of sunlight, indicating many sunny days — a great month for sightseeing.If your ideal day consists of dry skies and pleasant temperatures, June, July, August, September and October typically offer the best circumstances for Cascais.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Portugal, check out our Cascais's climate page.
Cascais Temperature in August
Min Temperature
18°C (64°F)
Max Temperature
22°C (72°F)
Chance of Rain
7%
Precipitation
5 mm (0.2 in)
Rainy days
2 days
Humidity
73%
Sunshine
355 hours
Percentage Sunshine
84%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Cascais typically stay consistent throughout August, with daily highs averaging around 22°C (72°F). Nights are pleasant, with lows around 18°C (64°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Cascais in August
Browse day-by-day weather records for Cascais spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cascais historical weather extremes in August
According to our 49 years of weather records for Cascais, the following extremes were recorded between 1976 and 2025.
- The lowest daytime temperature in August was 20°C (68°F), recorded on August 26, 1993.
- Cascais registered its coldest August night on August 13, 1983, with temperatures dropping to 11°C (52°F).
Best Places in Portugal in August
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in August →
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What to Wear in Cascais in August
Pleasant temperatures in August mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. With minimal rainfall expected, you can leave the rain gear at home. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Cascais in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Portugal, check out our Cascais's climate page.
Temperature Rainfall Sunshine Humidity
See the full Cascais climate overview or explore weather in Portugal.
