Weather in Mount Prospect in September
Mount Prospect, United States averages a high of 23.1°C (73.6°F) and low of 15.5°C (59.9°F) in September, with 8 rain days and 9.8 hours of daily sunshine. Travel score: 84.9/100 (Excellent). The best time to visit Mount Prospect is September.
High
23°C74°F
Low
16°C60°F
🌧️
8
rain days
☀️
9.8
hrs/day sunshine
💧
70%
humidity
85— Excellent
September in Mount Prospect is warm and mostly dry — excellent conditions for exploring.
What are the average temperatures in Mount Prospect?
How much does it rain in Mount Prospect in September?
Mount Prospect receives an average of 72.2mm of rainfall across 8 rainy days in September. The annual total is 923.8mm.
What should I pack for Mount Prospect 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
🎉Visiting United States in September?
Don't miss any public holidays — check before you book!
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Data based on 1994–2024 averages · Last updated: 2024-12-31