January in Brentwood averages a daily high of 7.9°C with nights around 1.5°C. Expect roughly 14.5 wet days totalling 55.3mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Brentwood is June–September.
Based on WRITTLE, UK (15km), 1995–2024. 29 years of January data.