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Vacaville (CA)
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Vacaville (CA)
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United States weather

Weather in Vacaville, California for September 2026

Your guide to Vacaville weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Vacaville has been nearly identical to the historical average, with a temperature of 30.6 °F (showing only a slight deviation of 0.3 °F).

  • The forecast for the upcoming days in Vacaville predicts a temperature of 32.4 °F, which is slightly above the historical average.

  • In general, the average temperature in Vacaville at the beginning of September is 30.4 °F. As the month progressed, temperatures tended to slightly increase, reaching an average of 30.9 °F by the end of September.

    • Rain 🌧️

  • Precipitation in Vacaville during September is a rare event, with an average of fewer than 2 rainy days.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
30°/14°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
64 %
Avg humidity

Vacaville Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
32°
2
Cloudy
30°
3
Mist
30°
4
Mist
31°
5
Mist
29°
6
Mist
29°
7
Mist
32°
8
Overcast
32°
9
Overcast
31°
10
Mist
32°
11
Overcast
30°
12
Mist
31°
13
Mist
28°
14
Mist
33°
15
Sunny
34°
16
Sunny
32°
17
Sunny
32°
18
Moderate rain at times
29°
19
Overcast
31°
20
Mist
30°
21
Sunny
31°
22
Sunny
33°
23
Sunny
34°
24
Sunny
33°
25
Sunny
31°
26
Overcast
30°
27
Sunny
28°
28
Sunny
30°
29
Sunny
31°
30
Sunny
33°

Temperatures trend during September in Vacaville

See the weather trend as well as the moving average line

September weather in Vacaville day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 32° /13° 0 mm 10
Sept. 2 Cloudy
Cloudy
 30° /14° 0 mm 8
Sept. 3 Mist
Mist
 30° /13° 0 mm 7
Sept. 4 Mist
Mist
 31° /12° 0 mm 8
Sept. 5 Mist
Mist
 29° /11° 0 mm 8
Sept. 6 Mist
Mist
 29° /13° 0 mm 7
Sept. 7 Mist
Mist
 32° /12° 0 mm 7
Sept. 8 Overcast
Overcast
 32° /12° 0 mm 7
Sept. 9 Overcast
Overcast
 31° /19° 0 mm 3
Sept. 10 Mist
Mist
 32° /17° 0 mm 6
Sept. 11 Overcast
Overcast
 30° /14° 0 mm 7
Sept. 12 Mist
Mist
 31° /14° 0 mm 8
Sept. 13 Mist
Mist
 28° /11° 0 mm 7
Sept. 14 Mist
Mist
 33° /14° 0 mm 7
Sept. 15 Sunny
Sunny
 34° /15° 0 mm 8
Sept. 16 Sunny
Sunny
 32° /14° 0 mm 8
Sept. 17 Sunny
Sunny
 32° /13° 0 mm 8
Sept. 18 Moderate rain at times
Moderate rain at times
 29° /14° 5.8 mm 7
Sept. 19 Overcast
Overcast
 31° /14° 0 mm 7
Sept. 20 Mist
Mist
 30° /14° 0 mm 4
Sept. 21 Sunny
Sunny
 31° /13° 0 mm 6.2
Sept. 22 Sunny
Sunny
 33° /13° 0 mm 6.3
Sept. 23 Sunny
Sunny
 34° /16° 0 mm 6.4
Sept. 24 Sunny
Sunny
 33° /18° 0 mm 6.3
Sept. 25 Sunny
Sunny
 31° /14° 0 mm 5.8
Sept. 26 Overcast
Overcast
 30° /15° 0 mm 7
Sept. 27 Sunny
Sunny
 28° /11° 0 mm 7
Sept. 28 Sunny
Sunny
 30° /15° 0 mm 8
Sept. 29 Sunny
Sunny
 31° /15° 0 mm 8
Sept. 30 Sunny
Sunny
 33° /18° 0 mm 8
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 💧
Typically, Vacaville has 1 rainy days in September with a total of 11.5 mm of rainfall.

UV exposure in Vacaville during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Vacaville?

Get accurate weather forecasts for Vacaville, located at latitude 38.357 and longitude -121.988. Stay updated with localized weather information tailored for Vacaville.

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