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Sintra Weather in May
May in Sintra sees daytime temperatures around 19°C (66°F) and lows of 15°C (59°F) at night. Pack a rain jacket because some rainfall is likely.
Rainfall in Sintra in May
You can typically expect 9 days of rain this month, averaging around 46 mm (1.8 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Sintra in May
In May, expect pleasant temperatures in Sintra, with highs of 19°C (66°F) and lows of 15°C (59°F) at night. Conditions are often most pleasant around the middle of the day. Nights cool down to 15°C (59°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Sintra in May
Enjoy a sunny month with about 316 hours of sunshine, the clear skies make Sintra even more beautiful.If you prefer dry days with pleasant temperatures, June, July, August, September and October typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Sintra Temperature in May
Min Temperature
15°C (59°F)
Max Temperature
19°C (66°F)
Chance of Rain
29%
Precipitation
46 mm (1.8 in)
Rainy days
9 days
Humidity
74% *
Sunshine
316 hours *
Percentage Sunshine
71% *
* 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 May, with daily highs averaging around 19°C (66°F). Nights are cool, with lows typically ranging from 12°C (54°F) to 15°C (59°F).
Average temperatures in May
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 May
Historical weather records for Sintra in May
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 May
According to our 50 years of weather records for Sintra, the following extremes were recorded between 1976 and 2026.
- On May 28, 2001, temperatures climbed to 36°C (97°F), marking the warmest May day on record.
- The lowest daytime temperature in May was 13°C (55°F), recorded on May 9, 1981.
- Sintra registered its coldest May night on May 1, 2008, with temperatures dropping to 5°C (41°F).
Best Places in Portugal in May
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in May →
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 May
Pleasant temperatures in May 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. Rain gear is recommended, you can expect wet weather on multiple days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Sintra in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
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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