April in San Marcos averages a daily high of 26.9°C with nights around 13.8°C. Expect roughly 6.7 wet days totalling 77.6mm. 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. 29 years of April data.