Weather in Vallejo in September
Vallejo, United States averages a high of 27.6°C (81.7°F) and low of 13.7°C (56.7°F) in September, with 1 rain days and 11.7 hours of daily sunshine. Travel score: 97.1/100 (Excellent). The best time to visit Vallejo is September.
High
28°C82°F
Low
14°C57°F
🌧️
1
rain days
☀️
11.7
hrs/day sunshine
💧
66%
humidity
97— Excellent
September in Vallejo is warm and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Vallejo?
How much does it rain in Vallejo in September?
Vallejo receives an average of 2.9mm of rainfall across 1 rainy days in September. The annual total is 527.7mm.
What should I pack for Vallejo in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 28°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Evening jacket or cardigan
Temperature drops 14°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