Weather in Castle Rock in September
Castle Rock, United States averages a high of 23.8°C (74.8°F) and low of 9.1°C (48.4°F) in September, with 6 rain days and 11.1 hours of daily sunshine. Travel score: 87.9/100 (Excellent). The best time to visit Castle Rock is August.
High
24°C75°F
Low
9°C48°F
🌧️
6
rain days
☀️
11.1
hrs/day sunshine
💧
51%
humidity
88— Excellent
September in Castle Rock is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Castle Rock?
How much does it rain in Castle Rock in September?
Castle Rock receives an average of 33.7mm of rainfall across 6 rainy days in September. The annual total is 486.9mm.
What should I pack for Castle Rock in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 24°C
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Evening jacket or cardigan
Temperature drops 15°C from day to night
🎉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