Rio de Onor Weather in May
May in Rio de Onor sees daytime temperatures around 19°C (66°F) and lows of 8°C (46°F) at night. With around 81 mm (3.2 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Rio de Onor in May
You can expect rain on roughly 14 days based on historical data, averaging 81 mm (3.2 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 Rio de Onor in May
In May, Rio de Onor gets pleasant temperatures, with highs of 19°C (66°F). Nights cool to around 8°C (46°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With lows around 8°C (46°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Rio de Onor in May
Expect a lot of sunshine this month, with about 261 hours of sun. These sunny conditions add to the overall experience.
Wind Speed in Rio de Onor in May
Average wind speeds reach 3 m/s (6 knots) in May, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.For Rio de Onor itself, June, July, August and September generally stand out with the best 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 Rio de Onor's climate page.
Rio de Onor Temperature in May
Min Temperature
8°C (46°F)
Max Temperature
19°C (66°F)
Chance of Rain
45%
Precipitation
81 mm (3.2 in)
Rainy days
14 days
Humidity
63% *
Windspeed
3 m/s (6 knots) *
Sunshine
261 hours *
Percentage Sunshine
60% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Rio de Onor typically rise from around 18°C (64°F) at the start of May to approximately 23°C (73°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°F) to 11°C (52°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 Rio de Onor in May
Browse day-by-day weather records for Rio de Onor spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Rio de Onor historical weather extremes in May
Based on 49 years of weather observations in Rio de Onor between 1976 and 2025, these are the recorded extremes.
- The hottest May day on record in Rio de Onor reached 34°C (93°F) (May 29, 2025).
- On May 17, 1984, Rio de Onor saw its coldest May day with temperatures maxing out at 8°C (46°F).
- Rio de Onor registered its coldest May night on May 5, 2010, with temperatures dropping to -2°C (28°F).
- The wettest May day on record brought 35 mm (1.4 in) of precipitation to Rio de Onor (May 4, 2015).
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
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tolerable
unpleasant
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What to Wear in Rio de Onor in May
For Rio de Onor 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. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Rio de Onor 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 Rio de Onor's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Rio de Onor climate overview or explore weather in Portugal.
