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Porto Weather in May
May in Porto brings pleasant temperatures, with highs of 20°C (68°F) and nights dropping to 14°C (57°F). Rainfall is on the higher side this month, averaging around 98 mm (3.9 in), so keep a rain jacket handy.
Rainfall in Porto in May
Expect around 13 days of rain based on historical data, with 98 mm (3.9 in) average. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Porto in May
The temperature in Porto in May is excellent. Daytime highs reach 20°C (68°F), with nights dropping to 14°C (57°F). Conditions are often most pleasant around the middle of the day. At 14°C (57°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.
Sunshine in Porto in May
The month enjoys around 255 hours of sunshine, creating mostly sunny days with good weather conditions.
Wind Speed in Porto in May
May has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.
Average water temperature in May
With water at 15°C (59°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.If you're inclined towards comfortable temperatures and drier conditions, May is a good time to visit Porto.
Porto Temperature in May
Min Temperature
14°C (57°F)
Max Temperature
20°C (68°F)
Water Temperature
15°C (59°F)
Chance of Rain
43%
Precipitation
98 mm (3.9 in)
Rainy days
13 days
Humidity
74%
Windspeed
5 m/s (10 knots)
Sunshine
255 hours
Percentage Sunshine
61%
Porto Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Porto - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Porto typically stay consistent throughout May, with daily highs averaging around 20°C (68°F). Nights are cool, with lows typically ranging from 10°C (50°F) to 13°C (55°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 Porto in May
Browse day-by-day weather records for Porto spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Porto historical weather extremes in May
Based on weather observations in Porto between 1976 and 2026, these are the recorded extremes during May.
- The hottest May day on record in Porto reached 33°C (91°F) (May 23, 2017).
- The lowest daytime temperature in May was 11°C (52°F), recorded on May 6, 1985.
- Nighttime temperatures dropped to 3°C (37°F) on May 5, 1982, marking the coldest May night on record.
- The heaviest May precipitation occurred on May 1, 2015, when 50 mm (2 in) of precipitation fell.
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 Porto in May
For Porto in May, 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. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. The water temperature sits at about 15°C (59°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Porto in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Porto 3-Day Forecast
More climate data for Porto
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Porto climate overview or explore weather in Portugal.
Popular in May
Where to go in May - average daytime high across popular destinations.
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