San Luis Obispo (CA)
December
Weather in San Luis Obispo, California for December 2025
Your guide to San Luis Obispo weather in December - trends and predictions
So far, December 2025 in San Luis Obispo is slightly warmer than the historical average by 0.6 °F.
The forecast for the next days in San Luis Obispo predicts temperatures to be around 19 °F, close to the historical average.
In general, the average temperature in San Luis Obispo at the beginning of December is 19 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.7 °F by the end of December.
With an average of 3 rainy days, San Luis Obispo 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 Weather December
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Temperatures trend during December in San Luis Obispo
See the weather trend as well as the moving average line
December weather in San Luis Obispo 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 | 13° /5° | 0 mm | 3 | |
| Dec. 13 | Partly cloudy | 19° /11° | 0 mm | 0.5 | |
| Dec. 14 | Partly cloudy | 20° /9° | 0 mm | 0.6 | |
| Dec. 15 | Sunny | 24° /8° | 0 mm | 0.6 | |
| Dec. 16 | Sunny | 23° /11° | 0 mm | 0.6 | |
| Dec. 17 | Sunny | 21° /12° | 0 mm | 0 | |
| Dec. 18 | Sunny | 19° /10° | 0 mm | 4 | |
| Dec. 19 | Sunny | 18° /8° | 0 mm | 4 | |
| Dec. 20 | Sunny | 19° /9° | 0 mm | 4 | |
| Dec. 21 | Partly cloudy | 20° /10° | 0.1 mm | 4 | |
| Dec. 22 |  Patchy rain possible | 15° /10° | 1.4 mm | 3 | |
| Dec. 23 | Partly cloudy | 15° /6° | 0 mm | 4 | |
| Dec. 24 | Partly cloudy | 16° /7° | 0 mm | 4 | |
| Dec. 25 | Partly cloudy | 16° /8° | 0 mm | 4 | |
| Dec. 26 | Partly cloudy | 17° /6° | 0 mm | 4 | |
| Dec. 27 |  Light rain | 13° /9° | 3.7 mm | 3 | |
| Dec. 28 | Overcast | 19° /5° | 0 mm | 4 | |
| Dec. 29 |  Mist | 12° /6° | 0 mm | 3 | |
| Dec. 30 | Sunny | 16° /6° | 0 mm | 5 | |
| Dec. 31 | Sunny | 17° /1° | 0 mm | 5 | |
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Important Notice
Our weather forecast for San Luis Obispo 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 forecast closer to your planned date for the most up-to-date weather information.
Change Month
San Luis Obispo in December - FAQ
What are the expected maximum and minimum temperatures in San Luis Obispo 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 during December?
In December, San Luis Obispo 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 during December?
The average wind speed in San Luis Obispo during December is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in San Luis Obispo
Explore the daily rainfall trends and prepare for San Luis Obispos December weather 💧
Typically, San Luis Obispo has 3 rainy days in December with a total of 30 mm of rainfall.
UV exposure in San Luis Obispo 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?Get accurate weather forecasts for San Luis Obispo, located at latitude 35.283 and longitude -120.66. Stay updated with localized weather information tailored for San Luis Obispo.
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