San Luis Obispo County (San Luis Obispo)
December
Weather in San Luis Obispo County, California for December 2025
Your guide to San Luis Obispo County weather in December - trends and predictions
So far, December 2025 in San Luis Obispo County is slightly warmer than the historical average by 1.3 °F.
Expect cooler weather in the next days in San Luis Obispo County with the forecast suggesting a temperature of 17.8 °F, lower than the historical average.
In general, the average temperature in San Luis Obispo County at the beginning of December is 19 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.3 °F by the end of December.
With an average of 3 rainy days, San Luis Obispo County experiences minimal rainfall in December.
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Temperatures
Rain 🌧️
More
28
Dry days
3
Rainy days
0
Snow days
17°/6°
Temperatures
14 km/h
Avg max wind
69 %
Avg humidity
San Luis Obispo County Weather December
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Temperatures trend during December in San Luis Obispo County
See the weather trend as well as the moving average line
December weather in San Luis Obispo County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 |  Cloudy | 17° /8° | 0 mm | 4 | |
| Dec. 2 |  Overcast | 17° /5° | 0 mm | 5 | |
| Dec. 3 | Cloudy | 16° /6° | 0 mm | 4 | |
| Dec. 4 |  Sunny | 17° /4° | 0 mm | 5 | |
| Dec. 5 |  Partly cloudy | 22° /5° | 0 mm | 6 | |
| Dec. 6 | Sunny | 23° /7° | 0 mm | 6 | |
| Dec. 7 | Partly cloudy | 21° /7° | 0 mm | 6 | |
| Dec. 8 | Cloudy | 21° /8° | 0 mm | 5 | |
| Dec. 9 | Partly cloudy | 21° /6° | 0 mm | 6 | |
| Dec. 10 | Sunny | 23° /7° | 0 mm | 6 | |
| Dec. 11 | Overcast | 21° /5° | 0 mm | 5 | |
| Dec. 12 | Overcast | 17° /7° | 0 mm | 5 | |
| Dec. 13 | Overcast | 16° /8° | 0 mm | 4 | |
| Dec. 14 |  Moderate or heavy rain shower | 16° /7° | 7 mm | 4 | |
| Dec. 15 |  Mist | 17° /5° | 0 mm | 4 | |
| Dec. 16 | Overcast | 20° /7° | 0 mm | 5 | |
| Dec. 17 | Sunny | 26° /13° | 0 mm | 0.6 | |
| Dec. 18 | Sunny | 25° /9° | 0 mm | 0.6 | |
| Dec. 19 | Partly cloudy | 19° /7° | 0 mm | 0.5 | |
| Dec. 20 | Sunny | 24° /8° | 0 mm | 0.5 | |
| Dec. 21 | Overcast | 18° /12° | 0 mm | 0.4 | |
| Dec. 22 | Cloudy | 21° /12° | 0 mm | 0 | |
| Dec. 23 |  Patchy rain possible | 18° /11° | 0.4 mm | 3 | |
| Dec. 24 |  Heavy rain | 15° /12° | 22.1 mm | 3 | |
| Dec. 25 | Heavy rain | 14° /9° | 21.1 mm | 3 | |
| Dec. 26 | Heavy rain | 12° /8° | 21.2 mm | 3 | |
| Dec. 27 | Patchy rain possible | 14° /6° | 0.3 mm | 2 | |
| Dec. 28 | Partly cloudy | 12° /7° | 0 mm | 3 | |
| Dec. 29 | Partly cloudy | 14° /6° | 0 mm | 3 | |
| Dec. 30 | Sunny | 17° /6° | 0 mm | 4 | |
| Dec. 31 | Sunny | 17° /1° | 0 mm | 5 | |
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Important Notice
Our weather forecast for San Luis Obispo County in December 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 December - FAQ
What are the expected maximum and minimum temperatures in San Luis Obispo County during December?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Luis Obispo County during December?
In December, San Luis Obispo County can expect light to moderate rainfall, totaling 30 mm across approximately 3 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in San Luis Obispo County during December?
The average wind speed in San Luis Obispo County during December is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in San Luis Obispo County
Explore the daily rainfall trends and prepare for San Luis Obispo Countys December weather 💧
Typically, San Luis Obispo County has 3 rainy days in December with a total of 30 mm of rainfall.
UV exposure in San Luis Obispo County during December
Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
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Where is San Luis Obispo County?Get accurate weather forecasts for San Luis Obispo County, located at latitude 35.283 and longitude -120.66. Stay updated with localized weather information tailored for San Luis Obispo County.
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