Climate almanac
West Islip
New York, United States · 40.71°, -73.31°
What is the weather like in West Islip in September?
In September, West Islip is typically 73°F (23°C) during the day and 66°F (19°C) at night. The month brings about 4.3 in (108 mm) of precipitation in total.
- Average high73°F (23°C)
- Average low66°F (19°C)
- Precipitation4.3 in (108 mm)
- Clear or mostly clear days11
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)