Climate averages 1991–2020
Santiago de Compostela weather
in September.
A mild, moderately wet month: the 3rd warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Santiago de Compostela: daytime highs average 21.7°C and nights cool to about 12.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 69 mm of rain on roughly 9 days, which makes September a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 32 min on an average September day.
The nearest other city in this atlas is Pontevedra (51 km away). In September its highs average 23.3°C, 1.6°C warmer than Santiago de Compostela, with 84 mm of rain.
Among the 93 cities listed in Spain, Santiago de Compostela ranks joint 85th of 93 for the warmest September highs and 75th of 93 for the driest September (rainfall, lowest first). The mean September high of those 93 cities is 25.5°C; Santiago de Compostela is 3.8°C cooler than that mean.
From September to October, average highs fall by 3.9°C to 17.8°C, and monthly rainfall rises from 69 mm to 140 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Santiago de Compostela climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.8°C4.0°C | 4.0°C | 141 | 13.9 | 9.49 h |
| February | 11.7°C3.8°C | 3.8°C | 101 | 11.7 | 10.511 h |
| March | 14.0°C5.3°C | 5.3°C | 106 | 12.1 | 11.912 h |
| April | 15.3°C6.6°C | 6.6°C | 115 | 14.4 | 13.413 h |
| May | 17.8°C9.1°C | 9.1°C | 92 | 13.0 | 14.615 h |
| June | 20.8°C11.7°C | 11.7°C | 54 | 8.7 | 15.315 h |
| July | 23.1°C13.7°C | 13.7°C | 30 | 5.9 | 15.015 h |
| August | 23.6°C14.2°C | 14.2°C | 44 | 7.2 | 13.914 h |
| September, selected | 21.7°C12.6°C | 12.6°C | 69 | 9.1 | 12.513 h |
| October | 17.8°C10.2°C | 10.2°C | 140 | 13.5 | 11.111 h |
| November | 13.4°C7.0°C | 7.0°C | 151 | 15.3 | 9.810 h |
| December | 11.5°C4.9°C | 4.9°C | 142 | 13.8 | 9.19 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Pontevedra in SeptemberSpain · 51 kmHigh 23.3°C · Low 14.8°C · 84 mm rain
- A Coruña in SeptemberSpain · 56 kmHigh 21.5°C · Low 15.2°C · 68 mm rain
- Vigo in SeptemberSpain · 73 kmHigh 22.0°C · Low 14.6°C · 88 mm rain
- Lugo in SeptemberSpain · 82 kmHigh 21.1°C · Low 11.8°C · 55 mm rain
- Ourense in SeptemberSpain · 82 kmHigh 24.4°C · Low 13.5°C · 48 mm rain
- Braga in SeptemberPortugal · 148 kmHigh 23.8°C · Low 13.7°C · 79 mm rain
- Porto in SeptemberPortugal · 193 kmHigh 24.1°C · Low 15.7°C · 64 mm rain
- Avilés in SeptemberSpain · 225 kmHigh 20.2°C · Low 15.3°C · 80 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Santiago de Compostela) is explained once on the Santiago de Compostela year overview and on the Sources, method and limits page.