Warm in Sep
28°C average high
avg high · 19° at night
25°C+ on 9 in 10 days
Spain
Barcelona weather in September
Is it warm? Yes. September in Barcelona is warm: afternoons average 25°C and nights 18°C. Most days (80%) peak between 22°C and 28°C.
Warm · average high
25°C
25°C or more on about six in ten days; 20°C or more on almost every day.
- Average low18°overnight
- Sea25°average, 2023–2025
- Rainy days893 mm in the month
- SkyOften cloudy51% cloud · 26% clear days
How warm it really gets
Every September afternoon from 2011–2025: 450 days. Most (80%) peaked between 22° and 28°.
September, year by year
The average September high in each year. The warmest, 2023, averaged 27°C; the coolest, 2015, 23°C.
Compared with home
Average September highs. Expect rain on about 8 days (93 mm in a typical month).
- Barcelona25°
- London19°
- Manchester17°
- Dublin17°
- Cork17°
- Belfast16°
- Glasgow16°
Warmer in September, not much further
Flying times are estimates from Dublin; Barcelona is about 2h 15m.
Warm in Sep
28°C average high
avg high · 22° at night
25°C+ on 9 in 10 days
Warm in Sep
27°C average high
avg high · 21° at night
25°C+ on 9 in 10 days
Air: ERA5 reanalysis via Open-Meteo, 2011–2025. Sea: Copernicus Marine analysis via Open-Meteo, 2023–2025. Rainy day = 2 mm or more. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology