Cape Cod National Seashore in September
In September, Cape Cod National Seashore averages a high of 71°F and a low of 58°F, with 3.6 inches of precipitation (rain plus melted snow). About 481,000 people visit, the 3rd busiest of 12 (busy). Days are 12 hours 26 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 71° / 58°F
- Precipitation
- 3.6in
- Snow
- –in
- Daylight
- 12h 26m
- Visitors
- 481,000
- Crowds
- Busy
September is one of the best months to visit: mild weather with busy crowds.
Weather 1991–2020 averages at Chatham Muni AP, MA, 25.5 miles from the park's center, 68 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in September
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Boston National Historical Park | 73° / 58° | Busy | Mild |
| Acadia National Park | 71° / 53° | Very busy | Mild |
| Gateway National Recreation Area | 76° / 61° | Busy | Mild |
| Stonewall National Monument | 76° / 62° | Few or no visits | Mild, wet |
| Castle Clinton National Monument | 76° / 62° | Busy | Mild, wet |
Closures, reservations and alerts: Cape Cod National Seashore on nps.gov
All twelve months at Cape Cod National Seashore · National parks to visit in September