Weather in Napa in September
Napa, United States averages a high of 29.3°C (84.7°F) and low of 14.2°C (57.6°F) in September, with 1 rain days and 11.6 hours of daily sunshine. Travel score: 99.2/100 (Excellent). The best time to visit Napa is July.
High
29°C85°F
Low
14°C58°F
🌧️
1
rain days
☀️
11.6
hrs/day sunshine
💧
60%
humidity
99— Excellent
September in Napa is hot and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Napa?
How much does it rain in Napa in September?
Napa receives an average of 3.8mm of rainfall across 1 rainy days in September. The annual total is 608.5mm.
What should I pack for Napa in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 29°C
🧴
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
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