September in Montero averages a daily high of 32.4°C with nights around 18.1°C. Expect roughly 3 wet days totalling 32mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Montero is July.
Based on VIRU VIRU INTERNATIONAL, BL (36.2km), 1995–2024. 21 years of September data.