Weather in Mount Vernon in September
Mount Vernon, United States averages a high of 23.7°C (74.7°F) and low of 15.8°C (60.4°F) in September, with 9 rain days and 9.1 hours of daily sunshine. Travel score: 82.4/100 (Excellent). The best time to visit Mount Vernon is July.
High
24°C75°F
Low
16°C60°F
🌧️
9
rain days
☀️
9.1
hrs/day sunshine
💧
75%
humidity
82— Excellent
September in Mount Vernon is warm and occasionally wet — excellent conditions for exploring.
What are the average temperatures in Mount Vernon?
How much does it rain in Mount Vernon in September?
Mount Vernon receives an average of 101.2mm of rainfall across 9 rainy days in September. The annual total is 1126.7mm.
What should I pack for Mount Vernon in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 24°C
🧴
Sunscreen SPF 30+
9 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Light rain jacket
Some rainy days expected (9 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