Detroit, Michigan weather in August

Averages from 2021–2025 (155 days of record).

Average high

81°F

Average low

64°F

Rainy days

~10 per month

Total precipitation

2.6 in

Warmest recorded

92°F

Coldest recorded

49°F

Expect August days in Detroit, Michigan to top out around 81°F and cool to about 64°F overnight, with roughly 10 days of measurable rain across the month. In recent years August has ranged from 49°F to 92°F.