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Sintra Weather in August
August is one of the excellent months to visit Sintra, with daytime temperatures of 23°C (73°F) and lows of 18°C (64°F) at night. Rainfall is minimal, averaging just 5.7 mm (0.2 in) for the month.
Rainfall in Sintra in August
Typically around 2 days of rainfall are expected, averaging 5.7 mm (0.2 in) for the month. The occasional light shower is possible, but rain is rarely an issue this month.
Temperature in Sintra in August
August tends to be one of the excellent months in Sintra, with 23°C (73°F) in the afternoon and 18°C (64°F) overnight. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows of 18°C (64°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest. On average, it is the month with the highest temperature of the year.
Sunshine in Sintra in August
There are approximately 355 hours of sunshine this month, resulting in mostly clear days.If you favor pleasant temperatures and minimal rainfall, August is one of the best months to visit Sintra.
Sintra Temperature in August
Min Temperature
18°C (64°F)
Max Temperature
23°C (73°F)
Chance of Rain
8%
Precipitation
5.7 mm (0.2 in)
Rainy days
2 days
Humidity
73% *
Sunshine
355 hours *
Percentage Sunshine
84% *
* Data from: Cascais, Portugal (11 KM, 7 Miles).
Sintra Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sintra - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sintra typically stay consistent throughout August, with daily highs averaging around 23°C (73°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 records for Sintra in August
Browse day-by-day weather records for Sintra spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sintra historical weather extremes in August
Based on weather observations in Sintra between 1976 and 2026, these are the recorded extremes during August.
- The warmest day in August was on August 4, 2018, with a maximum of 42°C (108°F).
- The lowest daytime temperature in August was 20°C (68°F), recorded on August 1, 2011.
- Nighttime temperatures dropped to 11°C (52°F) on August 31, 2020, marking the coldest August night on record.
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 →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Sintra in August
For Sintra in August, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Almost no rain is expected, so no need to bring rain gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Sintra in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming10/10 -
Cycling10/10 -
Walking10/10 -
Barbeque9/10 -
Camping10/10 -
Outdoor sports10/10
Sintra 3-Day Forecast
More climate data for Sintra
Temperature Rainfall Sunshine Humidity
See the full Sintra climate overview or explore weather in Portugal.
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