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Weather in Santa Rosa, California for September 2026

Your guide to Santa Rosa weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Small Craft Advisory - See hour by hour.

    • Temperatures

  • So far, September 2026 in Santa Rosa is slightly warmer than the historical average by 1.3 °F.

  • The forecast for the upcoming days in Santa Rosa predicts a temperature of 30.6 °F, which is slightly above the historical average.

  • In general, the average temperature in Santa Rosa at the beginning of September is 26.3 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 29.3 °F by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, Santa Rosa experiences minimal rainfall in September.

    • More

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

Average dry days
28
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/11°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
72 %
Avg humidity

Santa Rosa Weather September

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

Temperatures trend during September in Santa Rosa

See the weather trend as well as the moving average line

September weather in Santa Rosa day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Mist
Mist
 24° /11° 0 mm 6
Sept. 2 Patchy rain possible
Patchy rain possible
 24° /11° 7.9 mm 5
Sept. 3 Mist
Mist
 25° /12° 14.8 mm 5
Sept. 4 Sunny
Sunny
 28° /12° 0 mm 7
Sept. 5 Sunny
Sunny
 28° /11° 0 mm 7
Sept. 6 Mist
Mist
 27° /10° 0 mm 7
Sept. 7 Mist
Mist
 28° /10° 0 mm 7
Sept. 8 Sunny
Sunny
 28° /10° 0 mm 7
Sept. 9 Mist
Mist
 28° /13° 0 mm 5
Sept. 10 Cloudy
Cloudy
 26° /12° 0 mm 6
Sept. 11 Sunny
Sunny
 27° /11° 0 mm 7
Sept. 12 Cloudy
Cloudy
 27° /11° 0 mm 7
Sept. 13 Sunny
Sunny
 27° /11° 0 mm 7
Sept. 14 Sunny
Sunny
 29° /12° 0 mm 7
Sept. 15 Mist
Mist
 27° /11° 0 mm 7
Sept. 16 Partly cloudy
Partly cloudy
 25° /11° 0 mm 7
Sept. 17 Mist
Mist
 24° /11° 0 mm 6
Sept. 18 Mist
Mist
 24° /11° 3.2 mm 6
Sept. 19 Mist
Mist
 25° /12° 0 mm 6
Sept. 20 Mist
Mist
 23° /11° 0 mm 4
Sept. 21 Sunny
Sunny
 26° /11° 0 mm 6.4
Sept. 22 Sunny
Sunny
 28° /11° 0 mm 6.3
Sept. 23 Sunny
Sunny
 32° /14° 0 mm 6.4
Sept. 24 Overcast
Overcast
 29° /15° 0 mm 6
Sept. 25 Sunny
Sunny
 29° /13° 0 mm 5.9
Sept. 26 Sunny
Sunny
 28° /12° 0 mm 7
Sept. 27 Sunny
Sunny
 27° /10° 0 mm 7
Sept. 28 Sunny
Sunny
 29° /12° 0 mm 7
Sept. 29 Sunny
Sunny
 31° /12° 0 mm 8
Sept. 30 Sunny
Sunny
 32° /15° 0 mm 8
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Important Notice
Our weather forecast for Santa Rosa 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 Santa Rosa forecast closer to your planned date for the most up-to-date weather information.
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Santa Rosa in September - FAQ

What are the expected maximum and minimum temperatures in Santa Rosa during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Santa Rosa during September?
Rainfall in Santa Rosa during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 2 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.

What are the typical wind conditions in Santa Rosa during September?
The average wind speed in Santa Rosa during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Santa Rosa

Explore the daily rainfall trends and prepare for Santa Rosas September weather 💧
Typically, Santa Rosa has 2 rainy days in September with a total of 6.6 mm of rainfall.

UV exposure in Santa Rosa during September

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

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Location coordinates Where is Santa Rosa?

Get accurate weather forecasts for Santa Rosa, located at latitude 38.44 and longitude -122.714. Stay updated with localized weather information tailored for Santa Rosa.

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