December in Montero averages a daily high of 32.6°C with nights around 21.5°C. Expect roughly 13.7 wet days totalling 161.6mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Montero is July.
Based on VIRU VIRU INTERNATIONAL, BL (36.2km), 1995–2024. 18 years of December data.