January in Lawang averages a daily high of 32.3°C with nights around 24.6°C. Expect roughly 13.3 wet days totalling 196.3mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Lawang is May–September.
Based on SURABAYA JUANDA, ID (51.6km), 1995–2024. 19 years of January data.