Climate almanac
Stony Brook
New York, United States · 40.93°, -73.14°
What is the weather like in Stony Brook in September?
In September, Stony Brook is typically 74°F (24°C) during the day and 64°F (18°C) at night. The month brings about 4.0 in (103 mm) of precipitation in total.
- Average high74°F (24°C)
- Average low64°F (18°C)
- Precipitation4.0 in (103 mm)
- Clear or mostly clear days11
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)