August in Stevenage averages a daily high of 23°C with nights around 12.7°C. Expect roughly 11.8 wet days totalling 61.6mm. Comfortable conditions for being outdoors all day.
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 August data.