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Santa Rosa (CA)
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Weather in Santa Rosa, California for September 2025

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

    Temperatures

  • Until now, September 2025 in Santa Rosa is cooler than usual, with temperatures averaging 23.9 °F, this is -2.5 °F below the typical seasonal average.

  • The forecast for the next days in Santa Rosa predicts temperatures to be around 26 °F, close to the historical average.

  • In general, the average temperature in Santa Rosa at the beginning of September is 26.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.6 °F by the end of September.

    • Rain 🌧️

  • Precipitation in Santa Rosa 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
26°/10°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
69 %
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
26°
2
Patchy rain possible
23°
3
Mist
28°
4
Partly cloudy
29°
5
Cloudy
29°
6
Mist
26°
7
Mist
26°
8
Overcast
25°
9
Mist
25°
10
Cloudy
24°
11
Sunny
26°
12
Cloudy
27°
13
Partly cloudy
26°
14
Sunny
28°
15
Mist
27°
16
Partly cloudy
26°
17
Sunny
38°
18
Partly cloudy
28°
19
Cloudy
25°
20
Partly cloudy
29°
21
Sunny
31°
22
Sunny
33°
23
Patchy rain possible
20°
24
Partly cloudy
23°
25
Sunny
25°
26
Patchy rain possible
20°
27
Patchy rain possible
22°
28
Sunny
24°
29
Sunny
26°
30
Sunny
25°

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
 26° /11° 0 mm 6
Sept. 2 Patchy rain possible
Patchy rain possible
 23° /11° 0.1 mm 6
Sept. 3 Mist
Mist
 28° /11° 0 mm 6
Sept. 4 Partly cloudy
Partly cloudy
 29° /12° 0 mm 7
Sept. 5 Cloudy
Cloudy
 29° /12° 0 mm 6
Sept. 6 Mist
Mist
 26° /11° 0 mm 6
Sept. 7 Mist
Mist
 26° /10° 0 mm 6
Sept. 8 Overcast
Overcast
 25° /10° 0 mm 6
Sept. 9 Mist
Mist
 25° /11° 0 mm 6
Sept. 10 Cloudy
Cloudy
 24° /10° 0 mm 5
Sept. 11 Sunny
Sunny
 26° /11° 0 mm 7
Sept. 12 Cloudy
Cloudy
 27° /11° 0 mm 6
Sept. 13 Partly cloudy
Partly cloudy
 26° /12° 0 mm 7
Sept. 14 Sunny
Sunny
 28° /12° 0 mm 7
Sept. 15 Mist
Mist
 27° /11° 0 mm 6
Sept. 16 Partly cloudy
Partly cloudy
 26° /11° 0 mm 6
Sept. 17 Sunny
Sunny
 38° /16° 0 mm 1.7
Sept. 18 Partly cloudy
Partly cloudy
 28° /15° 0 mm 1.4
Sept. 19 Cloudy
Cloudy
 25° /17° 0 mm 1.5
Sept. 20 Partly cloudy
Partly cloudy
 29° /16° 0 mm 1.5
Sept. 21 Sunny
Sunny
 31° /13° 0 mm 0
Sept. 22 Sunny
Sunny
 33° /14° 0 mm 6
Sept. 23 Patchy rain possible
Patchy rain possible
 20° /14° 1.1 mm 4
Sept. 24 Partly cloudy
Partly cloudy
 23° /12° 0 mm 5
Sept. 25 Sunny
Sunny
 25° /10° 0 mm 5
Sept. 26 Patchy rain possible
Patchy rain possible
 20° /14° 3.5 mm 4
Sept. 27 Patchy rain possible
Patchy rain possible
 22° /13° 0.2 mm 4
Sept. 28 Sunny
Sunny
 24° /12° 0 mm 5
Sept. 29 Sunny
Sunny
 26° /11° 0 mm 5
Sept. 30 Sunny
Sunny
 25° /11° 0 mm 5
Next
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 26° and cooler nights around 10°. 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 1 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 💧

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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