Click on a day for an hourly weather forecast
The temperatures in Castro Urdiales in September are comfortable with low of 16°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in Castro Urdiales during the month of September. 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 Castro Urdiales in September 2026.
If you’re planning to visit Castro Urdiales in the near future, we highly recommend that you review the 14 day weather forecast for Castro Urdiales before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 11° / 7° | 9 | 21 | 1 | 183 mm | Bad | Castro Urdiales in January |
| February | 11° / 7° | 9 | 18 | 1 | 171 mm | Bad | Castro Urdiales in February |
| March | 13° / 8° | 8 | 23 | 0 | 117 mm | Bad | Castro Urdiales in March |
| April | 15° / 9° | 8 | 23 | 0 | 113 mm | Ok | Castro Urdiales in April |
| May | 18° / 12° | 7 | 24 | 0 | 105 mm | Ok | Castro Urdiales in May |
| June | 21° / 14° | 6 | 24 | 0 | 111 mm | Good | Castro Urdiales in June |
| July | 23° / 17° | 4 | 27 | 0 | 69 mm | Perfect | Castro Urdiales in July |
| August | 24° / 17° | 3 | 28 | 0 | 67 mm | Perfect | Castro Urdiales in August |
| September | 22° / 16° | 4 | 26 | 0 | 78 mm | Good | Castro Urdiales in September |
| October | 20° / 14° | 5 | 26 | 0 | 107 mm | Good | Castro Urdiales in October |
| November | 15° / 10° | 9 | 21 | 0 | 206 mm | Ok | Castro Urdiales in November |
| December | 12° / 8° | 8 | 22 | 1 | 142 mm | Bad | Castro Urdiales in December |