Month guide · Seia, Portugal
Seia in September: weather and what to expect
September is the last month of the year with average highs above 20°C in Seia. September highs in Seia are now 2.1°C warmer than in 1991-2000. In September, Seia averages highs of 25°C and lows of 14°C, with about 7 rainy days and 63 mm of rain. Crowds in Centro are medium.
Is September a good time to visit?
Good for
No verdicts for Seia in September yet. They only use climate values that are precise enough to judge with.
Not ideal for
Nothing stands out as a weaker fit.
Daily highs through September
Town-level · ERA5-Land 1991-2020Highs fall about 5°C over the month.
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 Seia |
|---|---|---|---|
| Vila Velha de Ródão, Centro | 28°C | 5 | 84 km |
| Sardoal, Oeste e Vale do Tejo | 27°C | 5 | 105 km |
| Atalaia, Alentejo | 27°C | 6 | 108 km |
| Nisa, Alentejo | 27°C | 5 | 100 km |
| Gavião, Alentejo | 27°C | 6 | 107 km |
The nearest towns with a warmer September. Distances are in a straight line.
How September is changing
Town-level · ERA5-LandSeptember highs are 2.1°C warmer than in 1991-2000, and September rainfall is down about 25% (2016-2025 against 1991-2000). Days above 30°C in September went from 1.9 to 3.9 a year on average.
Questions about Seia in September
How warm is Seia in September?
Average highs are 25°C and lows 14°C. August averages 29°C and October 19°C.
Does it rain much in Seia in September?
About 7 days have at least 1 mm of rain, with 63 mm in total over the month.
Is Seia busy in September?
In September 2025, nights booked through online platforms in Centro 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 Seia in September?
About 12 h 32 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