September in Grimsby averages a daily high of 18.6°C with nights around 10.2°C. Expect roughly 10.5 wet days totalling 50.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Grimsby is June–September.
Based on WADDINGTON, UK (59.6km), 1995–2024. 29 years of September data.