January in Grays averages a daily high of 8.5°C with nights around 2.4°C. Expect roughly 14.3 wet days totalling 58.8mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Grays is May–September.
Based on HEATHROW, UK (8.6km), 1995–2024. 30 years of January data.