January in Harlow averages a daily high of 7.2°C with nights around 1.2°C. Expect roughly 16 wet days totalling 66.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Harlow is June–September.
Based on ROTHAMSTED, UK (17.3km), 1995–2024. 30 years of January data.