Santa Rosa
September
Weather in Santa Rosa for September 2025
Your guide to Santa Rosa weather in September - trends and predictions
In general, the average temperature in Santa Rosa at the beginning of September is 29.3 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 30.4 °C by the end of September.
Santa Rosa experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 333.7 mm.
Temperatures
Rain 🌧️
3
Dry days
27
Rainy days
0
Snow days
29°/25°
Temperatures
17 km/h
Avg max wind
84 %
Avg humidity
Santa Rosa Weather September
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Temperatures trend during September in Santa Rosa
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September weather in Santa Rosa day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Moderate or heavy rain shower | 30° /25° | 29.4 mm | 7 | |
| 2 Sept. | Moderate or heavy rain shower | 25° /24° | 90.7 mm | 6 | |
| 3 Sept. | Moderate rain at times | 29° /25° | 10.7 mm | 6 | |
| 4 Sept. |  Heavy rain at times | 29° /25° | 10 mm | 6 | |
| 5 Sept. | Heavy rain at times | 30° /25° | 4.7 mm | 7 | |
| 6 Sept. | Moderate rain at times | 31° /26° | 1.8 mm | 7 | |
| 7 Sept. | Moderate or heavy rain shower | 31° /25° | 3.8 mm | 7 | |
| 8 Sept. |  Patchy rain possible | 30° /25° | 0.1 mm | 7 | |
| 9 Sept. | Moderate rain at times | 28° /24° | 1.2 mm | 6 | |
| 10 Sept. | Patchy rain possible | 30° /24° | 0.7 mm | 7 | |
| 11 Sept. | Heavy rain at times | 30° /25° | 4.6 mm | 7 | |
| 12 Sept. | Moderate or heavy rain shower | 30° /25° | 9.4 mm | 7 | |
| 13 Sept. | Moderate or heavy rain shower | 28° /25° | 35.7 mm | 6 | |
| 14 Sept. | Moderate or heavy rain shower | 27° /24° | 31.3 mm | 6 | |
| 15 Sept. | Patchy rain possible | 28° /25° | 4.9 mm | 6 | |
| 16 Sept. | Moderate or heavy rain shower | 29° /24° | 3.6 mm | 6 | |
| 17 Sept. | Heavy rain at times | 28° /23° | 8.4 mm | 6 | |
| 18 Sept. | Moderate or heavy rain shower | 27° /23° | 29.5 mm | 6 | |
| 19 Sept. | Moderate rain at times | 29° /25° | 3.2 mm | 6 | |
| 20 Sept. | Heavy rain at times | 29° /24° | 4 mm | 6 | |
| 21 Sept. | Moderate or heavy rain shower | 27° /23° | 22.5 mm | 6 | |
| 22 Sept. | Moderate or heavy rain shower | 28° /23° | 8.5 mm | 6 | |
| 23 Sept. | Patchy rain possible | 31° /24° | 2.2 mm | 7 | |
| 24 Sept. | Moderate or heavy rain shower | 31° /25° | 6.5 mm | 7 | |
| 25 Sept. |  Overcast | 32° /25° | 0.2 mm | 7 | |
| 26 Sept. | Overcast | 31° /25° | 0 mm | 7 | |
| 27 Sept. | Patchy rain possible | 30° /24° | 1.3 mm | 7 | |
| 28 Sept. | Patchy rain possible | 30° /25° | 0.7 mm | 7 | |
| 29 Sept. | Patchy rain possible | 29° /26° | 0.6 mm | 6 | |
| 30 Sept. | Light rain shower | 30° /26° | 3.5 mm | 7 | |
| 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.
Change Month
Santa Rosa in September - FAQ
What are the expected maximum and minimum temperatures in Santa Rosa during September?
During September, expect a variety of temperatures with highs around 29° and lows near 25°, suitable for diverse activities and preferences.
How much rainfall should be expected in Santa Rosa during September?
Significant rainfall exceeding 333.7 mm is expected in Santa Rosa during September, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Santa Rosa during September?
The average wind speed in Santa Rosa during September is 17 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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