May in Pontiac averages a daily high of 21.3°C with nights around 9.2°C. Expect roughly 12.5 wet days totalling 97mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Pontiac is May–September.
Based on PONTIAC WWTP, MI US (2.9km), 1995–2024. 15 years of May data.