San Luis Obispo County (San Luis Obispo)
September
Weather in San Luis Obispo County, California for September 2027
Your guide to San Luis Obispo County weather in September - trends and predictions
In general, the average temperature in San Luis Obispo County at the beginning of September is 27 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.4 °C by the end of September.
Precipitation in San Luis Obispo County during September is a rare event, with an average of fewer than 2 rainy days.
Is September a good time to visit San Luis Obispo County? check out the best time to travel to San Luis Obispo County page.
✨ Is September a good time to visit San Luis Obispo County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
29
Dry days
1
Rainy days
0
Snow days
25°/14°
Temperatures
15 km/h
Avg max wind
69 %
Avg humidity
San Luis Obispo County Weather September
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Temperatures trend during September in San Luis Obispo County
See the weather trend as well as the moving average line
September weather in San Luis Obispo County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 25° /13° | 0 mm | 8 | |
| Sept. 2 | Sunny | 26° /13° | 0 mm | 8 | |
| Sept. 3 | Sunny | 27° /14° | 0 mm | 8 | |
| Sept. 4 | Sunny | 25° /15° | 0.4 mm | 6 | |
| Sept. 5 | Sunny | 29° /15° | 0 mm | 8 | |
| Sept. 6 | Sunny | 28° /15° | 0 mm | 8 | |
| Sept. 7 | Sunny | 29° /14° | 0 mm | 8 | |
| Sept. 8 | Sunny | 29° /15° | 0 mm | 5 | |
| Sept. 9 | Sunny | 30° /15° | 0 mm | 7 | |
| Sept. 10 | Sunny | 27° /14° | 0 mm | 7 | |
| Sept. 11 | Sunny | 25° /12° | 0 mm | 7 | |
| Sept. 12 | Sunny | 24° /12° | 0 mm | 6 | |
| Sept. 13 | Sunny | 23° /12° | 0 mm | 6 | |
| Sept. 14 | Sunny | 27° /13° | 0 mm | 7 | |
| Sept. 15 |  Partly cloudy | 23° /13° | 0 mm | 6 | |
| Sept. 16 | Partly cloudy | 22° /13° | 0 mm | 6 | |
| Sept. 17 |  Mist | 25° /14° | 0 mm | 7 | |
| Sept. 18 |  Patchy rain possible | 21° /13° | 2.4 mm | 6 | |
| Sept. 19 | Mist | 21° /13° | 0 mm | 6 | |
| Sept. 20 |  Thundery outbreaks possible | 21° /12° | 0 mm | 4 | |
| Sept. 21 | Mist | 23° /12° | 0 mm | 6 | |
| Sept. 22 | Partly cloudy | 24° /12° | 0 mm | 7 | |
| Sept. 23 |  Light rain | 28° /16° | 3.2 mm | 7 | |
| Sept. 24 | Light rain | 24° /16° | 8 mm | 6 | |
| Sept. 25 | Partly cloudy | 24° /13° | 0 mm | 6 | |
| Sept. 26 | Partly cloudy | 23° /13° | 0 mm | 5 | |
| Sept. 27 | Partly cloudy | 22° /13° | 0 mm | 6 | |
| Sept. 28 | Partly cloudy | 21° /12° | 0 mm | 5 | |
| Sept. 29 | Partly cloudy | 25° /13° | 0 mm | 6 | |
| Sept. 30 | Partly cloudy | 25° /14° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for San Luis Obispo County 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 San Luis Obispo County forecast closer to your planned date for the most up-to-date weather information.
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San Luis Obispo County in September - FAQ
What are the expected maximum and minimum temperatures in San Luis Obispo County during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Luis Obispo County during September?
Expect minimal rainfall in San Luis Obispo County during September, with a total of 14 mm over approximately 1 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in San Luis Obispo County during September?
The average wind speed in San Luis Obispo County during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in San Luis Obispo County
Explore the daily rainfall trends and prepare for San Luis Obispo Countys September weather 💧
Typically, San Luis Obispo County has 1 rainy days in September with a total of 14 mm of rainfall.
UV exposure in San Luis Obispo County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in San Luis Obispo County
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