September in Pharr averages a daily high of 34.6°C with nights around 23.7°C. Expect roughly 7.8 wet days totalling 111mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Pharr is November–March.
Based on MCALLEN MILLER INTERNATIONAL AIRPORT, TX US (6.3km), 1995–2024. 30 years of September data.