September in Leander averages a daily high of 32.7°C with nights around 20°C. Expect roughly 5.7 wet days totalling 94mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Leander is February–April.
Based on GEORGETOWN LAKE, TX US (16.7km), 1995–2024. 28 years of September data.