Weather in Waukesha in September
Waukesha, United States averages a high of 22.5°C (72.5°F) and low of 14.3°C (57.7°F) in September, with 8 rain days and 9.7 hours of daily sunshine. Travel score: 82.7/100 (Excellent). The best time to visit Waukesha is July.
High
23°C73°F
Low
14°C58°F
🌧️
8
rain days
☀️
9.7
hrs/day sunshine
💧
71%
humidity
83— Excellent
September in Waukesha is warm and occasionally wet — excellent conditions for exploring.
What are the average temperatures in Waukesha?
How much does it rain in Waukesha in September?
Waukesha receives an average of 72.5mm of rainfall across 8 rainy days in September. The annual total is 856.8mm.
What should I pack for Waukesha in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 23°C
🧴
Sunscreen SPF 30+
10 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Light rain jacket
Some rainy days expected (8 days)
☔
Umbrella
Be prepared for occasional showers
Traveling to United States in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31