January in Olathe averages a daily high of 4.2°C with nights around -5.7°C. Expect roughly 5.1 wet days totalling 25.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Olathe is September–October.
Based on OLATHE JOHNSON CO EXECUTIVE AIRPORT, KS US (7.7km), 1995–2024. 28 years of January data.