Weather in San Bernardino in September
San Bernardino, United States averages a high of 32.1°C (89.8°F) and low of 17.6°C (63.7°F) in September, with 2 rain days and 11.7 hours of daily sunshine. Travel score: 97.9/100 (Excellent). The best time to visit San Bernardino is June.
High
32°C90°F
Low
18°C64°F
🌧️
2
rain days
☀️
11.7
hrs/day sunshine
💧
49%
humidity
98— Excellent
September in San Bernardino is hot and dry — excellent conditions for exploring.
What are the average temperatures in San Bernardino?
How much does it rain in San Bernardino in September?
San Bernardino receives an average of 8mm of rainfall across 2 rainy days in September. The annual total is 362.8mm.
What should I pack for San Bernardino in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light, breathable clothing
Hot weather with highs around 32°C
🧢
Sun hat or cap
Protection from intense sun
🧴
Sunscreen SPF 30+
12 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?
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Data based on 1994–2024 averages · Last updated: 2024-12-31