Climate averages 1991–2020
Sant Boi de Llobregat weather
in September.
A warm, moderately wet month: the joint 3rd 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 Sant Boi de Llobregat: daytime highs average 23.6°C and nights cool to about 18.6°C. By daytime temperature it is the joint 3rd warmest of the 12 months.
Expect about 86 mm of rain on roughly 10 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 Barcelona (11 km away). In September its highs average 23.9°C, about as warm as Sant Boi de Llobregat, with 77 mm of rain.
Among the 93 cities listed in Spain, Sant Boi de Llobregat ranks joint 72nd of 93 for the warmest September highs and joint 85th of 93 for the driest September (rainfall, lowest first). The mean September high of those 93 cities is 25.5°C; Sant Boi de Llobregat is 1.9°C cooler than that mean.
From September to October, average highs fall by 3.4°C to 20.2°C, and monthly rainfall rises from 86 mm to 94 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
Sant Boi de Llobregat climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 12.4°C6.5°C | 6.5°C | 44 | 6.6 | 9.610 h |
| February | 12.8°C6.6°C | 6.6°C | 36 | 5.8 | 10.611 h |
| March | 14.8°C8.3°C | 8.3°C | 39 | 6.0 | 11.912 h |
| April | 16.6°C10.3°C | 10.3°C | 48 | 7.6 | 13.313 h |
| May | 19.7°C13.7°C | 13.7°C | 43 | 6.6 | 14.514 h |
| June | 23.6°C17.6°C | 17.6°C | 29 | 4.7 | 15.115 h |
| July | 26.4°C20.7°C | 20.7°C | 22 | 4.6 | 14.815 h |
| August | 26.8°C21.3°C | 21.3°C | 44 | 6.3 | 13.814 h |
| September, selected | 23.6°C18.6°C | 18.6°C | 86 | 9.9 | 12.513 h |
| October | 20.2°C15.3°C | 15.3°C | 94 | 10.1 | 11.111 h |
| November | 15.9°C10.5°C | 10.5°C | 64 | 7.8 | 9.910 h |
| December | 13.1°C7.6°C | 7.6°C | 44 | 6.4 | 9.39 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
- Barcelona in SeptemberSpain · 11 kmHigh 23.9°C · Low 17.8°C · 77 mm rain
- Rubí in SeptemberSpain · 17 kmHigh 24.1°C · Low 16.6°C · 87 mm rain
- Badalona in SeptemberSpain · 21 kmHigh 24.4°C · Low 17.7°C · 77 mm rain
- Sabadell in SeptemberSpain · 23 kmHigh 23.6°C · Low 16.5°C · 87 mm rain
- Terrassa in SeptemberSpain · 25 kmHigh 23.5°C · Low 15.4°C · 87 mm rain
- Mataró in SeptemberSpain · 41 kmHigh 23.8°C · Low 18.1°C · 86 mm rain
- Manresa in SeptemberSpain · 46 kmHigh 24.8°C · Low 14.9°C · 90 mm rain
- Tarragona in SeptemberSpain · 71 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 Sant Boi de Llobregat) is explained once on the Sant Boi de Llobregat year overview and on the Sources, method and limits page.