January in Round Rock averages a daily high of 15.8°C with nights around 2.9°C. Expect roughly 7 wet days totalling 60.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Round Rock is February–April.
Based on AUSTIN GREAT HILLS, TX US (13.4km), 1995–2024. 17 years of January data.