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 excellent 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.