Weather in Fullerton in September
Fullerton, United States averages a high of 30°C (86°F) and low of 17.8°C (64°F) in September, with 1 rain days and 11.6 hours of daily sunshine. Travel score: 97/100 (Excellent). The best time to visit Fullerton is August.
High
30°C86°F
Low
18°C64°F
🌧️
1
rain days
☀️
11.6
hrs/day sunshine
💧
66%
humidity
97— Excellent
September in Fullerton is hot and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Fullerton?
How much does it rain in Fullerton in September?
Fullerton receives an average of 5.9mm of rainfall across 1 rainy days in September. The annual total is 311.3mm.
What should I pack for Fullerton in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 30°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Evening jacket or cardigan
Temperature drops 12°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.
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Data based on 1994–2024 averages · Last updated: 2024-12-31