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Weather in Santa Rosa for September 2025

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

    Temperatures

  • In general, the average temperature in Santa Rosa at the beginning of September is 27.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 25.4 °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

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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 in September average weather

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

See the weather trend as well as the moving average line

September weather day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Mist
Mist
 23° /11° 0 mm 6
Sept. 2 Patchy rain possible
Patchy rain possible
 23° /11° 0.1 mm 6
Sept. 3 Mist
Mist
 29° /11° 0 mm 7
Sept. 4 Partly cloudy
Partly cloudy
 31° /13° 0 mm 8
Sept. 5 Cloudy
Cloudy
 31° /12° 0 mm 7
Sept. 6 Mist
Mist
 28° /10° 0 mm 7
Sept. 7 Mist
Mist
 26° /9° 0 mm 7
Sept. 8 Overcast
Overcast
 27° /10° 0 mm 7
Sept. 9 Mist
Mist
 28° /9° 0 mm 7
Sept. 10 Cloudy
Cloudy
 26° /9° 0 mm 6
Sept. 11 Sunny
Sunny
 28° /10° 0 mm 8
Sept. 12 Cloudy
Cloudy
 27° /10° 0 mm 7
Sept. 13 Partly cloudy
Partly cloudy
 29° /11° 0 mm 8
Sept. 14 Mist
Mist
 27° /11° 0 mm 7
Sept. 15 Mist
Mist
 24° /10° 0 mm 6
Sept. 16 Mist
Mist
 23° /10° 0 mm 6
Sept. 17 Mist
Mist
 21° /10° 0 mm 5
Sept. 18 Mist
Mist
 23° /11° 0 mm 5
Sept. 19 Mist
Mist
 22° /12° 0 mm 6
Sept. 20 Mist
Mist
 21° /10° 0 mm 5
Sept. 21 Partly cloudy
Partly cloudy
 23° /9° 0 mm 6
Sept. 22 Mist
Mist
 26° /8° 0 mm 6
Sept. 23 Mist
Mist
 28° /9° 0 mm 7
Sept. 24 Mist
Mist
 27° /10° 0 mm 7
Sept. 25 Patchy rain possible
Patchy rain possible
 20° /9° 0.6 mm 5
Sept. 26 Mist
Mist
 25° /11° 2.7 mm 6
Sept. 27 Sunny
Sunny
 30° /10° 0 mm 8
Sept. 28 Partly cloudy
Partly cloudy
 24° /9° 0 mm 6
Sept. 29 Cloudy
Cloudy
 26° /10° 0 mm 6
Sept. 30 Patchy rain possible
Patchy rain possible
 26° /11° 0 mm 7
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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.

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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