Barcelona weather, month by month
In January, when Dublin gets to about 8°C, Barcelona reaches 14°C. Warm, dry days, 24°C and over with little rain, come from June to July. The sea is warm enough for a comfortable swim from July to October.
Every month
| Month | Daytime high | Night-time low | Sea | Rain a month | Dublin, for comparison |
|---|---|---|---|---|---|
| January | 14°C | 5°C | 14°C | 37mm | 8°C |
| February | 14°C | 5°C | 13°C | 35mm | 9°C |
| March | 16°C | 7°C | 13°C | 36mm | 10°C |
| April | 18°C | 9°C | 14°C | 40mm | 12°C |
| May | 21°C | 13°C | 17°C | 47mm | 15°C |
| June | 25°C | 17°C | 21°C | 30mm | 18°C |
| July | 28°C | 20°C | 24°C | 21mm | 20°C |
| August | 29°C | 20°C | 26°C | 62mm | 19°C |
| September | 26°C | 17°C | 24°C | 81mm | 17°C |
| October | 22°C | 14°C | 21°C | 91mm | 14°C |
| November | 17°C | 9°C | 18°C | 59mm | 10°C |
| December | 14°C | 6°C | 15°C | 40mm | 8°C |
Measured at Barcelona Aeropuerto, averaged over 1991 to 2020. Somewhere inland or up a mountain will differ.
Questions
What is the warmest month in Barcelona?
August, with daytime highs around 29°C and nights around 20°C. The sea is warmest in August, at about 26°C.
Is Barcelona warm in winter?
In January, the coolest month, daytime highs are around 14°C and nights drop to about 5°C. That is 6 degrees warmer than Dublin in the same month.
When is the sea warm enough to swim in Barcelona?
The sea is 21°C or warmer from July to October. It is at its coolest in February, around 13°C.
When does it rain most in Barcelona?
October, with about 91mm on average. Dublin gets about 78mm in October.
Averages for 1991 to 2020. Temperature and rainfall from Met Éireann, AEMET and IPMA. Sea temperature generated using Copernicus Climate Change Service information 2026, adapted, CC BY 4.0.
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