Climate almanac
Groton
Connecticut, United States · 41.35°, -72.08°
What is the weather like in Groton in September?
In September, Groton is typically 71°F (22°C) during the day and 64°F (18°C) at night. The month brings about 3.9 in (99 mm) of precipitation in total.
- Average high71°F (22°C)
- Average low64°F (18°C)
- Precipitation3.9 in (99 mm)
- Clear or mostly clear days10
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)