May in Cranston averages a daily high of 20.4°C with nights around 9.6°C. Expect roughly 12.2 wet days totalling 92.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Cranston is May–September.
Based on RHODE ISLAND T.F. GREEN INTERNATIONAL AIRPORT, RI US (6.4km), 1995–2024. 30 years of May data.