Cascais Weather in May
Cascais in May sees pleasant temperatures, with highs around 19°C (66°F) and overnight lows of 15°C (59°F). Around 43 mm (1.7 in) of rainfall is typical, so a light rain jacket is a sensible addition to your bag.
Rainfall in Cascais in May
Typically around 9 days of rainfall are expected, averaging 43 mm (1.7 in) for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Cascais in May
In May, expect pleasant temperatures in Cascais, 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. With lows of 15°C (59°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.
Sunshine in Cascais in May
There are approximately 316 hours of sunshine this month, resulting in mostly clear days.Should you favor a climate that's both dry and comfortably warm, June, July, August, September and October typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 May
Min Temperature
15°C (59°F)
Max Temperature
19°C (66°F)
Chance of Rain
28%
Precipitation
43 mm (1.7 in)
Rainy days
9 days
Humidity
74%
Sunshine
316 hours
Percentage Sunshine
71%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Cascais 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 for Cascais in May
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 May
The extremes listed below come from historical weather data collected in Cascais from 1976 through 2026.
- The warmest day in May was on May 28, 2001, with a maximum of 36°C (97°F).
- Cascais experienced its chilliest May day on May 9, 1981, reaching only 13°C (55°F).
- Cascais registered its coldest May night on May 14, 1988, with temperatures dropping to 7°C (45°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
What to Wear in Cascais 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. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Cascais in May
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.
