May in Northampton averages a daily high of 17.6°C with nights around 7.3°C. Expect roughly 12.1 wet days totalling 57.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Northampton is June–September.
Based on WELLESBOURNE, UK (49.3km), 1995–2024. 29 years of May data.