Click on a day for an hourly weather forecast
The temperatures in Castro in January are usually low and can range between 10°C and 18°C.
You can expect about 3 to 8 days of rain in Castro during the month of January. 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 in January 2026.
If you’re planning to visit Castro in the near future, we highly recommend that you review the 14 day weather forecast for Castro before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 18° / 10° | 5 | 26 | 0 | 81 mm | Good | Castro in January |
| February | 18° / 10° | 6 | 22 | 0 | 107 mm | Good | Castro in February |
| March | 17° / 10° | 8 | 24 | 0 | 134 mm | Ok | Castro in March |
| April | 14° / 9° | 10 | 20 | 0 | 180 mm | Ok | Castro in April |
| May | 12° / 8° | 13 | 19 | 0 | 277 mm | Bad | Castro in May |
| June | 10° / 6° | 13 | 17 | 0 | 270 mm | Bad | Castro in June |
| July | 9° / 5° | 13 | 18 | 0 | 256 mm | Bad | Castro in July |
| August | 10° / 5° | 13 | 18 | 0 | 306 mm | Bad | Castro in August |
| September | 11° / 5° | 10 | 20 | 0 | 182 mm | Bad | Castro in September |
| October | 12° / 6° | 10 | 21 | 0 | 162 mm | Bad | Castro in October |
| November | 14° / 7° | 9 | 21 | 0 | 154 mm | Ok | Castro in November |
| December | 16° / 9° | 8 | 23 | 0 | 151 mm | Ok | Castro in December |