January in Plano averages a daily high of 13.1°C with nights around 1.7°C. Expect roughly 7.8 wet days totalling 70.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Plano is March–April.
Based on RICHARDSON, TX US (4.9km), 1995–2024. 17 years of January data.