May in Stevenage averages a daily high of 18.2°C with nights around 7.7°C. Expect roughly 10.7 wet days totalling 48.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Stevenage is May–September.
Based on CAMBRIDGE B. GDNS, UK (39.6km), 1995–2024. 21 years of May data.