Click on a day for an hourly weather forecast
The temperatures in Castelldefels in May are comfortable with low of 15°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Castelldefels during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Castelldefels in May 2026.
If you’re planning to visit Castelldefels in the near future, we highly recommend that you review the 14 day weather forecast for Castelldefels before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 13° / 8° | 3 | 28 | 0 | 44 mm | Ok | Castelldefels in January |
| February | 14° / 8° | 4 | 25 | 0 | 37 mm | Good | Castelldefels in February |
| March | 15° / 10° | 5 | 26 | 0 | 56 mm | Good | Castelldefels in March |
| April | 17° / 12° | 6 | 24 | 0 | 62 mm | Good | Castelldefels in April |
| May | 21° / 15° | 6 | 25 | 0 | 47 mm | Good | Castelldefels in May |
| June | 25° / 19° | 5 | 25 | 0 | 34 mm | Perfect | Castelldefels in June |
| July | 28° / 22° | 4 | 28 | 0 | 28 mm | Perfect | Castelldefels in July |
| August | 28° / 23° | 5 | 26 | 0 | 42 mm | Perfect | Castelldefels in August |
| September | 25° / 20° | 8 | 22 | 0 | 82 mm | Good | Castelldefels in September |
| October | 22° / 17° | 6 | 25 | 0 | 99 mm | Good | Castelldefels in October |
| November | 17° / 12° | 5 | 25 | 0 | 69 mm | Good | Castelldefels in November |
| December | 14° / 9° | 3 | 28 | 0 | 28 mm | Good | Castelldefels in December |