May in Brentwood averages a daily high of 17.8°C with nights around 7.2°C. Expect roughly 10.6 wet days totalling 45.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Brentwood is June–September.
Based on WRITTLE, UK (15km), 1995–2024. 29 years of May data.