‹ Door County weather by month
Typical September weather
Door County
Wisconsin · September
69° days
51° nights
about 6 rainy days · 12½ hours of daylight · lake 68°
What to pack
- Light jacket
What September feels like
After Labor Day the peninsula empties while the bay holds onto its summer warmth, which is why locals rate September above anything else on the calendar. Evenings cool quickly, so the porch you booked for the sunset wants a layer.
Expect about 6 days with real rain — enough to notice, not enough to plan around.
Can you swim?
The lake runs about 68° — brisk but swimmable.
The numbers
| Typical high | 69° |
|---|---|
| Typical low | 51° |
| Days with real rain | 6 |
| Total rain | 3.1 in |
| Water temperature | 68° |
| Sunrise / sunset (mid-month) | 6:28 am / 7:00 pm |