Weather in Rockville in September
Rockville, United States averages a high of 25.2°C (77.4°F) and low of 16.1°C (61°F) in September, with 9 rain days and 9.1 hours of daily sunshine. Travel score: 83.4/100 (Excellent). The best time to visit Rockville is September.
High
25°C77°F
Low
16°C61°F
🌧️
9
rain days
☀️
9.1
hrs/day sunshine
💧
72%
humidity
83— Excellent
September in Rockville is warm and occasionally wet — excellent conditions for exploring.
What are the average temperatures in Rockville?
How much does it rain in Rockville in September?
Rockville receives an average of 118.3mm of rainfall across 9 rainy days in September. The annual total is 1108.6mm.
What should I pack for Rockville in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 25°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