Spain
Barcelona in September: weather, sea & travel advice
This month's data profile
Sea conditions lead
Barcelona in September is climatically well suited to family holidays, beach holidays, city breaks and active holidays and hiking. The average daily high is around 26 °C, and the sea is about 24 °C. With about 9 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
86/100 · #1
Warmth
#4
Dryness
#12
Sun
#6
Sea warmth
#3
Published best categories: Overall, Beach, Family
Barcelona · SeptemberPhoto: JJxFile · CC BY-SA 4.0Climate facts
- Average high
- 26 °C
- Average low
- 17 °C
- Sea
- 24 °C
- Rainy days (est.)
- 9 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 69 %
For your trip planning
September: less heat than July, but more rain
September has lower daytime highs than July, while sea temperatures in our series are close. The rainy-day count rises, however. For a combined city-and-beach trip, this is a specific trade-off rather than a universally better month.
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 30 | 20 | 7 | 40 | 7.7 | 64 | 2.2 | 25 | 82 |
| September (selected) | 26 | 17 | 9 | 66 | 5.9 | 69 | 2.3 | 24 | 86 |
| October | 22 | 13 | 9 | 67 | 4.1 | 74 | 2.3 | 21 | 78 |
How do the previous and next months compare?
Baseline: September (86/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | -4 | +4.2 °C | +3.5 °C | -2.4 | -25.5 mm | +1.8 h | -5.5 % | ±0 m/s | +1.5 °C |
| October | -8 | -4.1 °C | -3.7 °C | -0.3 | +1 mm | -1.8 h | +4.8 % | ±0 m/s | -2.9 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Barcelona in September?
The average daily high is around 26 °C, with an average daily low of about 17 °C.
Can you swim in Barcelona in September?
The sea is about 24 °C (swimmable).
Does it rain a lot in Barcelona in September?
The curated estimate is about 9 rainy days per month, not a directly measured long-term average. Total precipitation averages around 66 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Barcelona?
By the climate score, June, July, August and September are the strongest months for Barcelona. For a beach trip: June, July, August and September. September is one of them.