Castelo Mendo Weather in May
During May, Castelo Mendo experiences pleasant daytime temperatures of 22°C (72°F) and cooler nights around 10°C (50°F). Expect quite a bit of rainfall. Around 60 mm (2.4 in) is typical.
Rainfall in Castelo Mendo in May
You can expect rain on roughly 12 days based on historical data, averaging 60 mm (2.4 in) for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Castelo Mendo in May
The perfect temperature in Castelo Mendo in May makes it a solid month to visit, with 22°C (72°F) during the day and 10°C (50°F) at night. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights drop to 10°C (50°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Castelo Mendo in May
Expect a lot of sunshine this month, with about 228 hours of sun. These sunny conditions add to the overall experience.If your ideal day consists of dry skies and pleasant temperatures, May, June, September and October typically offer the best circumstances for Castelo Mendo.
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 Castelo Mendo's climate page.
Castelo Mendo Temperature in May
Min Temperature
10°C (50°F)
Max Temperature
22°C (72°F)
Chance of Rain
41%
Precipitation
60 mm (2.4 in)
Rainy days
12 days
Humidity
73% *
Sunshine
228 hours *
Percentage Sunshine
*
Daily Historical Temperatures
45-year average (1976-2025)
Based on our historical records, temperatures in Castelo Mendo typically rise from around 13°C (55°F) at the start of May to approximately 18°C (64°F) by the end. Nights are cool, with lows typically ranging from 5°C (41°F) to 11°C (52°F).
Average temperatures in May
Daily Historical Precipitation
45-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 Castelo Mendo in May
Browse day-by-day weather records for Castelo Mendo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Castelo Mendo historical weather extremes in May
Based on 28 years of weather observations (1998-2026), these are the most extreme conditions recorded in Castelo Mendo.
- The hottest May day on record in Castelo Mendo reached 33°C (91°F) (May 27, 2026).
- Castelo Mendo registered its coldest May night on May 1, 2001, with temperatures dropping to -1°C (30°F).
- The wettest day in May Castelo Mendo was on May 7, 2016 with 40 mm (1.6 in) of precipitation.
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 →
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What to Wear in Castelo Mendo in May
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Castelo Mendo 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 Castelo Mendo's climate page.
Temperature Rainfall Sunshine Humidity
See the full Castelo Mendo climate overview or explore weather in Portugal.
