Click on a day for an hourly weather forecast
The temperatures in San Marcos in October are comfortable with low of 16°C and and high up to 25°C.
As it is almost never rain during October in San Marcos the weather is perfect for hanging out outside and exploring all that San Marcos has to offer.
Our weather forecast can give you a great sense of what weather to expect in San Marcos in October 2025.
If you’re planning to visit San Marcos in the near future, we highly recommend that you review the 14 day weather forecast for San Marcos before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 19° / 10° | 2 | 29 | 0 | 41 mm | Good | San Marcos in January |
| February | 19° / 10° | 2 | 26 | 0 | 46 mm | Good | San Marcos in February |
| March | 19° / 10° | 2 | 29 | 0 | 34 mm | Good | San Marcos in March |
| April | 21° / 11° | 0 | 30 | 0 | 15 mm | Good | San Marcos in April |
| May | 22° / 13° | 1 | 30 | 0 | 14 mm | Good | San Marcos in May |
| June | 25° / 15° | 0 | 30 | 0 | 3 mm | Perfect | San Marcos in June |
| July | 28° / 18° | 1 | 30 | 0 | 14 mm | Perfect | San Marcos in July |
| August | 29° / 19° | 1 | 30 | 0 | 10 mm | Good | San Marcos in August |
| September | 28° / 19° | 0 | 30 | 0 | 9 mm | Perfect | San Marcos in September |
| October | 25° / 16° | 0 | 31 | 0 | 11 mm | Perfect | San Marcos in October |
| November | 22° / 13° | 1 | 29 | 0 | 27 mm | Good | San Marcos in November |
| December | 18° / 10° | 3 | 28 | 0 | 49 mm | Good | San Marcos in December |