May in Racine averages a daily high of 16.5°C with nights around 8.4°C. Expect roughly 13.2 wet days totalling 115.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Racine is June–September.
Based on RACINE WWTP, WI US (2.6km), 1995–2024. 28 years of May data.