September in Nogales averages a daily high of 32.5°C with nights around 15.9°C. Expect roughly 6.5 wet days totalling 42.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Nogales is February–April.
Based on NOGALES INTERNATIONAL AIRPORT, AZ US (15.4km), 1995–2024. 26 years of September data.