September in Largo averages a daily high of 31.8°C with nights around 24.2°C. Expect roughly 13 wet days totalling 166mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Largo is November–April.
Based on ST PETERSBURG CLEARWATER INTERNATIONAL AIRPORT, FL US (10.1km), 1995–2024. 25 years of September data.