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May in Olhão sees daytime temperatures around 21°C (70°F) and lows of 16°C (61°F) at night. The excellent weather makes it a good time to visit.
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.
Pick a month to see the average temperature, rainfall and sunshine in Olhão - and find the best time to visit.
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).
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
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.
According to our 50 years of weather records for Olhão, the following extremes were recorded between 1976 and 2026.
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 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).
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.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Olhão climate overview or explore weather in Portugal.
Where to go in May - average daytime high across popular destinations.
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