October in San Marcos averages a daily high of 28.2°C with nights around 14.7°C. Expect roughly 6.1 wet days totalling 113.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit San Marcos is February–April.
Based on SAN MARCOS, TX US (0.8km), 1995–2024. 30 years of October data.