Climate almanac
Key West
Florida, United States · 24.56°, -81.78°
What is the weather like in Key West in September?
In September, Key West is typically 84°F (29°C) during the day and 81°F (27°C) at night. The month brings about 6.3 in (160 mm) of precipitation in total.
- Average high84°F (29°C)
- Average low81°F (27°C)
- Precipitation6.3 in (160 mm)
- Clear or mostly clear days9
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)