Typical August weather
Cape Cod
Massachusetts · August
80° days
63° nights
about 6 rainy days · 14 hours of daylight · ocean 69°
What to pack
- Sunscreen
What August feels like
August water is as warm as the Cape gets, which is why Provincetown Carnival and every beach lot fill by mid-morning. It's also the point in the season when the forecast is worth a glance — the Atlantic starts sending tropical systems up this way from late summer on.
Expect about 6 days with real rain — enough to notice, not enough to plan around.
Can you swim?
The ocean runs about 69° — brisk but swimmable.
The numbers
| Typical high | 80° |
|---|---|
| Typical low | 63° |
| Days with real rain | 6 |
| Total rain | 3.3 in |
| Water temperature | 69° |
| Sunrise / sunset (mid-month) | 5:50 am / 7:41 pm |