Month guide · Oñati, Spain
Oñati in September: weather and what to expect
September is the last month of the year with average highs above 20°C in Oñati. September highs in Oñati are now 1.3°C warmer than in 1991-2000. In September, Oñati averages highs of 23°C and lows of 14°C, with about 13 rainy days and 73 mm of rain. Crowds in Basque Country are high.
Is September a good time to visit?
Good for
No verdicts for Oñati in September yet. They only use climate values that are precise enough to judge with.
Not ideal for
- Reliable dry weatherAbout 13 rainy days in the month
Daily highs through September
Town-level · ERA5-Land 1991-2020Highs fall about 2°C over the month. A day above 30°C happens in roughly 1 September in 2; nights below 10°C in about 1 in 2.
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 Oñati |
|---|---|---|---|
| Santomera, Murcia | 30°C | 5 | 565 km |
| Guarromán, Andalusia | 30°C | 5 | 550 km |
| Benferri, Valencian Community | 30°C | 5 | 557 km |
| Ceutí, Murcia | 30°C | 5 | 559 km |
| Alguazas, Murcia | 30°C | 5 | 562 km |
The nearest towns with a warmer September. Distances are in a straight line.
How September is changing
Town-level · ERA5-LandSeptember highs are 1.3°C warmer than in 1991-2000, and September rainfall is about the same (2016-2025 against 1991-2000). Days above 25°C in September went from 9.5 to 12 a year on average.
Questions about Oñati in September
Is September a good time to visit Oñati?
It is less suited to reliable dry weather (about 13 rainy days in the month).
How warm is Oñati in September?
Average highs are 23°C and lows 14°C. August averages 26°C and October 19°C.
Does it rain much in Oñati in September?
About 13 days have at least 1 mm of rain, with 73 mm in total over the month.
Is Oñati busy in September?
In September 2025, nights booked through online platforms in Basque Country were about 60% of the busiest month, which we count as high. The figure is for the whole region and leaves out hotels.
How long are the days in Oñati in September?
About 12 h 34 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