Weather in Thornton in September
Thornton, United States averages a high of 24.9°C (76.8°F) and low of 10°C (50°F) in September, with 5 rain days and 11 hours of daily sunshine. Travel score: 89.7/100 (Excellent). The best time to visit Thornton is August.
High
25°C77°F
Low
10°C50°F
🌧️
5
rain days
☀️
11
hrs/day sunshine
💧
50%
humidity
90— Excellent
September in Thornton is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Thornton?
How much does it rain in Thornton in September?
Thornton receives an average of 33.5mm of rainfall across 5 rainy days in September. The annual total is 466.7mm.
What should I pack for Thornton in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 25°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
Traveling to United States in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
🏛️ 121 countries·📅 Updated yearly·✈️ Free forever
Compare Thornton
Popular comparisons:
How can I plan my trip to Thornton?
What other cities are near Thornton?
What are other popular cities in United States?
What is the weather like in other months in Thornton?
Data based on 1994–2024 averages · Last updated: 2024-12-31