Month guide · Rio Maior, Portugal
Rio Maior in September: weather and what to expect
In September, Rio Maior averages highs of 26°C and lows of 16°C, with about 5 rainy days and 38 mm of rain. Highs are 2°C cooler than in August and 4°C warmer than in October. Our rules rate it good for walking and cycling. Crowds in Oeste e Vale do Tejo are medium.
Is September a good time to visit?
Good for
- Walking and cyclingHighs of 26°C with about 5 rainy days
Not ideal for
Nothing stands out as a weaker fit.
Daily highs through September
Town-level · ERA5-Land 1991-2020Highs fall about 3°C over the month. A day above 35°C happens in roughly 1 September in 4.
September in detail
Town-level · ERA5-LandCrowds, holidays and daylight
Public holidays in September 2027
No national or regional public holidays.
Local (municipal) holidays are not included.
Warmer in September
Where is warm in September →| Place | High | Rain days | From Rio Maior |
|---|---|---|---|
| Almeirim, Oeste e Vale do Tejo | 28°C | 5 | 30 km |
| São Vicente do Paul, Oeste e Vale do Tejo | 28°C | 5 | 27 km |
| Vale de Santarém, Oeste e Vale do Tejo | 28°C | 5 | 24 km |
| Vale de Figueira, Oeste e Vale do Tejo | 27°C | 5 | 27 km |
| Pontével, Oeste e Vale do Tejo | 27°C | 5 | 23 km |
The nearest towns with a warmer September. Distances are in a straight line.
How September is changing
Town-level · ERA5-LandSeptember highs are 1.7°C warmer than in 1991-2000, and September rainfall is down about 30% (2016-2025 against 1991-2000). Days above 30°C in September went from 2.6 to 5.3 a year on average.
Questions about Rio Maior in September
Is September a good time to visit Rio Maior?
Our rules rate September good for walking and cycling (highs of 26°C with about 5 rainy days).
How warm is Rio Maior in September?
Average highs are 26°C and lows 16°C. August averages 28°C and October 22°C.
Does it rain much in Rio Maior in September?
About 5 days have at least 1 mm of rain, with 38 mm in total over the month.
Is Rio Maior busy in September?
In September 2025, nights booked through online platforms in Oeste e Vale do Tejo were about 40% of the busiest month, which we count as medium. The figure is for the whole region and leaves out hotels.
How long are the days in Rio Maior in September?
About 12 h 31 min from sunrise to sunset in the middle of the month.
Sources
Climate: ERA5-Land, Copernicus Climate Change Service (C3S) Climate Data Store, contains modified Copernicus information (CC BY 4.0). Crowds: Eurostat, nights spent in short-stay accommodation booked through online platforms (tour_ce_omn12) (CC BY 4.0). Place names and populations: GeoNames (CC BY 4.0). Climate averages cover 1991-2020. Daylight: calculated from the town's coordinates. Full methodology