Yountville Weather in September

In Yountville, September brings very high daytime temperatures around 30°C (86°F), with nights cooling to 11°C (52°F). Minimal rainfall is to be expected.

Rainfall in Yountville in September

Typically, about a single day will experience rainfall, with an average of 4.5 mm (0.2 in) for the month. If rain does fall, it tends to be a moderate shower rather than anything heavy.

Temperature in Yountville in September

September tends to be one of the perfect months in Yountville, with 30°C (86°F) in the afternoon and 11°C (52°F) overnight. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Yountville in September

There are approximately 275 hours of sunshine this month, resulting in mostly clear days.

For Yountville itself, April, May, June and October generally stand out with 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 Yountville's climate page.

Yountville Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 30°C (86°F)  

Chance of Rain 4%  

Precipitation 4.5 mm (0.2 in)  

Rainy days a single day  

Sunshine 275 hours *  

Percentage Sunshine 77% *  

* Data from: Healdsburg, the United States of America (49 KM, 31 Miles).

What to Wear in Yountville in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Almost no rain is expected, so no need to bring rain gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Yountville 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 Yountville's climate page.

More climate data for Yountville

Temperature Rainfall Sunshine

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