Milwaukee, Wisconsin weather in August

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

Average high: 80°F
Average low: 64°F
Rainy days: ~9 per month
Total precipitation: 2.8 in
Warmest recorded: 100°F
Coldest recorded: 51°F

Expect August days in Milwaukee, Wisconsin to top out around 80°F and cool to about 64°F overnight, with roughly 9 days of measurable rain across the month. In recent years August has ranged from 51°F to 100°F.

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Current Milwaukee, Wisconsin forecast → · Historical data by Open-Meteo (ERA5).