Vacaville Weather in September

Vacaville in September sees very high daytime temperatures of 32°C (90°F) and nighttime lows of 14°C (57°F). With just 3.6 mm (0.1 in) of rainfall expected, it's a dry month overall.

Rainfall in Vacaville in September

You can typically expect a single day of rain this month, averaging around 3.6 mm (0.1 in). If rain does fall, it tends to be very light and barely worth getting out an umbrella for.

Temperature in Vacaville in September

September tends to be one of the excellent months in Vacaville, with 32°C (90°F) in the afternoon and 14°C (57°F) overnight. If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights cool down to 14°C (57°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 Vacaville in September

Expect a lot of sunshine this month, with about 347 hours of sun. These sunny conditions add to the overall experience.

For Vacaville itself, April, May 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.