Vacaville (CA)
September
Weather in Vacaville, California for September 2026
Your guide to Vacaville weather in September - trends and predictions
In general, the average temperature in Vacaville at the beginning of September is 32.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.6 °F by the end of September.
Precipitation in Vacaville during September is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
Rain 🌧️
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29
Dry days
1
Rainy days
0
Snow days
30°/14°
Temperatures
18 km/h
Avg max wind
65 %
Avg humidity
Vacaville Weather September
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Temperatures trend during September in Vacaville
See the weather trend as well as the moving average line
September weather in Vacaville day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 40° /13° | 0 mm | 10 | |
| Sept. 2 |  Cloudy | 32° /14° | 0 mm | 7 | |
| Sept. 3 |  Mist | 36° /12° | 0 mm | 8 | |
| Sept. 4 | Mist | 34° /12° | 0 mm | 7 | |
| Sept. 5 | Mist | 30° /13° | 0 mm | 7 | |
| Sept. 6 | Mist | 27° /13° | 0 mm | 6 | |
| Sept. 7 | Mist | 29° /12° | 0 mm | 6 | |
| Sept. 8 |  Overcast | 26° /11° | 0 mm | 6 | |
| Sept. 9 | Overcast | 22° /16° | 0 mm | 5 | |
| Sept. 10 | Mist | 24° /14° | 0 mm | 5 | |
| Sept. 11 | Overcast | 26° /13° | 0 mm | 6 | |
| Sept. 12 | Mist | 31° /12° | 0 mm | 7 | |
| Sept. 13 | Mist | 27° /13° | 0 mm | 6 | |
| Sept. 14 | Mist | 34° /13° | 0 mm | 7 | |
| Sept. 15 | Sunny | 36° /16° | 0 mm | 9 | |
| Sept. 16 | Sunny | 38° /17° | 0 mm | 9 | |
| Sept. 17 | Sunny | 39° /15° | 0 mm | 9 | |
| Sept. 18 |  Moderate rain at times | 27° /16° | 11.5 mm | 6 | |
| Sept. 19 | Overcast | 29° /15° | 0 mm | 6 | |
| Sept. 20 | Mist | 31° /13° | 0 mm | 7 | |
| Sept. 21 | Mist | 33° /13° | 0 mm | 7 | |
| Sept. 22 | Sunny | 34° /16° | 0 mm | 8 | |
| Sept. 23 | Sunny | 40° /18° | 0 mm | 10 | |
| Sept. 24 | Cloudy | 28° /14° | 0 mm | 6 | |
| Sept. 25 | Overcast | 25° /14° | 0 mm | 6 | |
| Sept. 26 | Mist | 35° /12° | 0 mm | 8 | |
| Sept. 27 |  Partly cloudy | 28° /13° | 0 mm | 7 | |
| Sept. 28 | Overcast | 18° /14° | 0 mm | 4 | |
| Sept. 29 | Overcast | 24° /14° | 0 mm | 5 | |
| Sept. 30 | Overcast | 21° /16° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Vacaville in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Vacaville forecast closer to your planned date for the most up-to-date weather information.
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Vacaville in September - FAQ
What are the expected maximum and minimum temperatures in Vacaville during September?
Expect warm days with temperatures around 30°, cooling to mild conditions of 14° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Vacaville during September?
Expect minimal rainfall in Vacaville during September, with a total of 11.5 mm over approximately 1 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Vacaville during September?
The average wind speed in Vacaville during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Vacaville
Explore the daily rainfall trends and prepare for Vacavilles September weather 💧
UV exposure in Vacaville during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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