Rio de Onor Weather in September
September in Rio de Onor typically sees daytime highs of 23°C (73°F) and nighttime lows of 11°C (52°F). Expect some rainfall during the month.
Rainfall in Rio de Onor in September
Historically, September sees about 9 days of rain, with a monthly average of 51 mm (2 in). Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.
Temperature in Rio de Onor in September
The temperature in Rio de Onor in September is perfect. Daytime highs reach 23°C (73°F), with nights dropping to 11°C (52°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Rio de Onor in September
Expect sunny days throughout the month, with an estimated 241 hours of sunshine. This makes it a pleasant time to visit Rio de Onor.
Wind Speed in Rio de Onor in September
Wind speeds average 2 m/s (4 knots) during September. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Rio de Onor.
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 September
Min Temperature
11°C (52°F)
Max Temperature
23°C (73°F)
Chance of Rain
31%
Precipitation
51 mm (2 in)
Rainy days
9 days
Humidity
57% *
Windspeed
2 m/s (4 knots) *
Sunshine
241 hours *
Percentage Sunshine
68% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Rio de Onor typically drop from around 27°C (81°F) at the start of September to approximately 23°C (73°F) by the end. Nights are cool, with lows typically ranging from 10°C (50°F) to 14°C (57°F).
Average temperatures in September
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 September
Historical weather for Rio de Onor in September
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 September
According to our 49 years of weather records for Rio de Onor, the following extremes were recorded between 1976 and 2025.
- On September 6, 2016, temperatures climbed to 38°C (100°F), marking the warmest September day on record.
- The coldest September day was on September 30, 1993, with a maximum of 11°C (52°F).
- Nighttime temperatures dropped to 2°C (36°F) on September 22, 2025, marking the coldest September night on record.
Best Places in Portugal in September
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Rio de Onor in September
Pleasant temperatures in September 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. Rain gear is recommended, you can expect wet weather on multiple days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Rio de Onor in September
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.
