June in San Marcos averages a daily high of 34.1°C with nights around 22.3°C. Expect roughly 5.9 wet days totalling 82.1mm. Generally workable, with some weather to plan around.
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 June data.