Delaware weather in September: Statewide normals and every place, NOAA 1991-2020
In September, Delaware's statewide normal high is 79°F and normal low 59°F; normal highs run from 79°F in Wilmington to 80°F in Lewes (NOAA 1991-2020 normals).
- Statewide normal high
- 79°FSeptember, 1991-2020
- Statewide normal low
- 59°FSeptember, 1991-2020
- Statewide normal precipitation
- 4.22 inSeptember
- Warmest place
- 80°Fnormal high, Lewes
- Coolest place
- 79°Fnormal high, Wilmington
Where is Delaware warmest and wettest in September?
Lewes has the warmest September afternoons (80°F) and Wilmington the coolest (79°F). Newark gets the most precipitation (4.87 in) and Dover the least (4.25 in).
Statewide, September averaged 70.1°F in 2021, 69.3°F in 2022, 69.5°F in 2023, 69.0°F in 2024, 69.6°F in 2025, against a 1991-2020 normal of 69.1°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Wilmington | 79°F | 59°F | 4.38 | 0.0 |
| Dover | 79°F | 61°F | 4.25 | 0.0 |
| Newark | 79°F | 58°F | 4.87 | – |
| Georgetown | 80°F | 61°F | 4.54 | – |
| Lewes | 80°F | 64°F | 4.49 | 0.0 |
| Greenwood | 79°F | 58°F | 4.77 | 0.0 |
| Wilmington Porter Research | 75°F | 59°F | 5.13 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.