Connecticut weather in September: Statewide normals and every place, NOAA 1991-2020
In September, Connecticut's statewide normal high is 74°F and normal low 53°F; normal highs run from 69°F in Norfolk to 76°F in Hartford (NOAA 1991-2020 normals).
- Statewide normal high
- 74°FSeptember, 1991-2020
- Statewide normal low
- 53°FSeptember, 1991-2020
- Statewide normal precipitation
- 4.41 inSeptember
- Warmest place
- 76°Fnormal high, Hartford
- Coolest place
- 69°Fnormal high, Norfolk
Where is Connecticut warmest and wettest in September?
Hartford has the warmest September afternoons (76°F) and Norfolk the coolest (69°F). Stamford gets the most precipitation (5.21 in) and Groton the least (3.83 in).
Statewide, September averaged 65.2°F in 2021, 63.6°F in 2022, 65.1°F in 2023, 63.4°F in 2024, 64.3°F in 2025, against a 1991-2020 normal of 63.4°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Bridgeport | 75°F | 60°F | 3.96 | 0.0 |
| Stamford | 76°F | 56°F | 5.21 | 0.0 |
| New Haven | 75°F | 57°F | 4.03 | – |
| Hartford | 76°F | 54°F | 4.39 | 0.0 |
| Danbury | 74°F | 52°F | 4.81 | – |
| Meriden | 75°F | 54°F | 4.28 | – |
| Norwich | 76°F | 55°F | 4.79 | 0.0 |
| Ansonia | 75°F | 54°F | 4.38 | – |
| Willimantic | 74°F | 52°F | 4.11 | – |
| Storrs | 73°F | 54°F | 4.48 | 0.0 |
| Groton | 74°F | 57°F | 3.83 | – |
| Norfolk | 69°F | 51°F | 4.90 | 0.0 |
| Falls Village | 76°F | 49°F | 4.69 | – |
| Bakersville | 72°F | 49°F | 4.99 | 0.0 |
| Barkhamsted | 75°F | 51°F | 4.78 | 0.0 |
| Burlington | 75°F | 53°F | 5.01 | 0.0 |
| Hampton | 73°F | 51°F | 4.31 | – |
| Mount Carmel | 76°F | 55°F | 4.33 | – |
| Staffordville | 73°F | 51°F | 4.28 | – |
| West Thompson Lake | 73°F | 51°F | 3.91 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.