Olhão Weather in May
May in Olhão sees daytime temperatures around 21°C (70°F) and lows of 16°C (61°F) at night. The perfect weather makes it a good time to visit.
Rainfall in Olhão in May
Looking at the last 30 years, the data shows about 5 days with rain, averaging 28 mm (1.1 in) for the month. The odd shower may pass through, but it usually doesn't amount to much. A largely dry month overall.
Temperature in Olhão in May
May in Olhão is generally perfect, with days reaching 21°C (70°F) and nights settling around 16°C (61°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 16°C (61°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Olhão in May
Expect a lot of sunshine this month, with about 304 hours of sun. These sunny conditions add to the overall experience.
Wind Speed in Olhão in May
Wind speeds average 4 m/s (8 knots) during May. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.
Average water temperature in May
The water temperature is 17°C (63°F) — chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August, September and October typically offer the best weather for Olhão.
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 Olhão's climate page.
Olhão Temperature in May
Min Temperature
16°C (61°F)
Max Temperature
21°C (70°F)
Water Temperature
17°C (63°F) *
Chance of Rain
18%
Precipitation
28 mm (1.1 in)
Rainy days
5 days
Humidity
64% *
Windspeed
4 m/s (8 knots) *
Sunshine
304 hours *
Percentage Sunshine
68% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Olhão typically stay consistent throughout May, with daily highs averaging around 21°C (70°F). Nights are pleasant, with lows typically ranging from 13°C (55°F) to 17°C (63°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 Olhão in May
Browse day-by-day weather records for Olhão spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Olhão historical weather extremes in May
According to our 50 years of weather records for Olhão, the following extremes were recorded between 1976 and 2026.
- Olhão recorded its highest May temperature of 36°C (97°F) on May 14, 2012.
- Olhão experienced its chilliest May day on May 4, 1978, reaching only 14°C (57°F).
- Olhão registered its coldest May night on May 1, 1978, with temperatures dropping to 6°C (43°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 →
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What to Wear in Olhão 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. Pack a light rain jacket or compact umbrella for occasional showers. With water temperatures around 17°C (63°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Olhão 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 Olhão's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Olhão climate overview or explore weather in Portugal.
