Napa Weather in September

Napa in September sees high temperatures, with highs around 30°C (86°F) and overnight lows of 12°C (54°F). With just 3.8 mm (0.1 in) of rainfall on average, rain is rarely an issue.

Rainfall in Napa in September

Expect around a single day of rain based on historical data, with 3.8 mm (0.1 in) average. If rain does fall, it tends to be very light and barely worth getting out an umbrella for.

Temperature in Napa in September

Napa in September has perfect weather. Days reach 30°C (86°F) and nights cool to 12°C (54°F). Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 12°C (54°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable. On average, this month sees the highest temperatures of the year. Worth packing a few lighter outfits.

Sunshine in Napa in September

The days are predominantly sunny, with an estimated total of around 275 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

If you prefer enjoying temperate temperatures and rain-free days, April, May, June, July, August and October typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Napa's climate page.

Napa Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 30°C (86°F)  

Chance of Rain 3%  

Precipitation 3.8 mm (0.1 in)  

Rainy days a single day  

Sunshine 275 hours *  

Percentage Sunshine 77% *  

* Data from: Healdsburg, the United States of America (61 KM, 38 Miles).

What to Wear in Napa in September

Warm but pleasant conditions in Napa in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Dry conditions mean you won't need to worry about rain protection. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Napa in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Napa's climate page.

More climate data for Napa

Temperature Rainfall Sunshine

See the full Napa climate overview or explore weather in the United States of America.