Climate averages 1991–2020
Barcelona weather
in September.
A warm, moderately wet month: the 4th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Barcelona: daytime highs average 23.9°C and nights cool to about 17.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 77 mm of rain on roughly 11 days, which makes September a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 31 min on an average September day.
The nearest other city in this atlas is Badalona (10 km away). In September its highs average 24.4°C, about as warm as Barcelona, with 77 mm of rain.
Among the 93 cities listed in Spain, Barcelona ranks joint 69th of 93 for the warmest September highs and joint 76th of 93 for the driest September (rainfall, lowest first). The mean September high of those 93 cities is 25.5°C; Barcelona is 1.6°C cooler than that mean.
From September to October, average highs fall by 3.6°C to 20.3°C, and monthly rainfall rises from 77 mm to 90 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
Barcelona climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 12.4°C5.1°C | 5.1°C | 40 | 6.1 | 9.610 h |
| February | 13.1°C5.4°C | 5.4°C | 36 | 6.3 | 10.611 h |
| March | 15.3°C7.4°C | 7.4°C | 40 | 6.7 | 11.912 h |
| April | 17.3°C9.5°C | 9.5°C | 52 | 8.2 | 13.313 h |
| May | 20.6°C13.1°C | 13.1°C | 45 | 7.4 | 14.514 h |
| June | 24.5°C17.1°C | 17.1°C | 34 | 5.6 | 15.115 h |
| July | 27.2°C20.1°C | 20.1°C | 25 | 4.7 | 14.815 h |
| August | 27.4°C20.7°C | 20.7°C | 40 | 6.6 | 13.814 h |
| September, selected | 23.9°C17.8°C | 17.8°C | 77 | 10.5 | 12.513 h |
| October | 20.3°C14.4°C | 14.4°C | 90 | 9.9 | 11.111 h |
| November | 15.9°C9.4°C | 9.4°C | 60 | 8.0 | 9.910 h |
| December | 13.0°C6.2°C | 6.2°C | 41 | 5.7 | 9.29 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
- Badalona in SeptemberSpain · 10 kmHigh 24.4°C · Low 17.7°C · 77 mm rain
- Sant Boi de Llobregat in SeptemberSpain · 11 kmHigh 23.6°C · Low 18.6°C · 86 mm rain
- Rubí in SeptemberSpain · 16 kmHigh 24.1°C · Low 16.6°C · 87 mm rain
- Sabadell in SeptemberSpain · 18 kmHigh 23.6°C · Low 16.5°C · 87 mm rain
- Terrassa in SeptemberSpain · 23 kmHigh 23.5°C · Low 15.4°C · 87 mm rain
- Mataró in SeptemberSpain · 29 kmHigh 23.8°C · Low 18.1°C · 86 mm rain
- Manresa in SeptemberSpain · 47 kmHigh 24.8°C · Low 14.9°C · 90 mm rain
- Tarragona in SeptemberSpain · 82 kmHigh 25.3°C · Low 17.4°C · 77 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 Barcelona) is explained once on the Barcelona year overview and on the Sources, method and limits page.
Badalona lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.