Barcelona Weather in September
Spain · Mediterranean climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Barcelona sees average temperatures ranging from a low of 18.1°C (64.6°F) to a high of 25.7°C (78.3°F), with a mean of 21.8°C (71.2°F). Compared to the annual average of 16.7°C (62.1°F), this month is 5.1°C warmer than the yearly norm. Precipitation averages 85.0mm, making it approximately 32.0mm wetter than the monthly average of 52.0mm. The city receives an average of 10.3 hours of sunshine per day during September, with relative humidity averaging 75.5%. Wind speeds reach an average maximum of 18.0 km/h. For travelers, this month offers a temperature experience in Barcelona, with wetter-than-average conditions compared to the rest of the year.
If you're planning trail runs or beach days in Barcelona, timing is everything. I did the Carretera de les Aigües route in May and conditions were flawless — 21°C, 12km/h breeze, UV at 6. July-August pushes UV to 9+, which is brutal between noon and 4pm; shift activities to early morning. Sea temperature hits 26°C in August, perfect for swims. The wind picks up reliably afternoons year-round, helping with heat but making paddleboarding tricky. October is the unsung hero for hiking — cool, golden light, empty paths.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 25.5°C (77.9°F) | 21.8°C (71.2°F) | 18.3°C (64.9°F) |
| Rainfall | 50.2mm | 85.0mm | 80.5mm |
| Sunshine | 12.2 hrs | 10.3 hrs | 9.1 hrs |
| Humidity | 72.5% | 75.5% | 79.3% |
| Wind | 19.0 km/h | 18.0 km/h | 17.8 km/h |
| Rainy Days | 12.6 | 14.0 | 12.2 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Barcelona in September, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Barcelona in September?
The average temperature in Barcelona during September ranges from 18.1°C (64.6°F) to 25.7°C (78.3°F), with a mean of 21.8°C (71.2°F).
How much does it rain in Barcelona in September?
Barcelona receives an average of 85.0mm of precipitation in September, spread across approximately 14.0 rainy days.
What should I pack for Barcelona in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is September a good time to visit Barcelona?
September is a good time to visit Barcelona, with comfortable temperatures and manageable rainfall.
Other Months for Barcelona
Cities with Similar September Climate (Mediterranean)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 41.39°, 2.17°. Timezone: Europe/Madrid. Last updated: 2026-07-30.