San Luis Obispo County (San Luis Obispo)
December
Weather in San Luis Obispo County for December 2025
Your guide to San Luis Obispo County weather in December - trends and predictions
In general, the average temperature in San Luis Obispo County at the beginning of December is 18.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.9 °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 🌧️
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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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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  18° | 2  15° | 3 15° | 4  17° | 5  23° | 6 23° | |
| 7 19° | 8 19° | 9 18° | 10 19° | 11 18° | 12 13° | 13 13° |
| 14  13° | 15  12° | 16 16° | 17 19° | 18 22° | 19 23° | 20 14° |
| 21 13° | 22 18° | 23 17° | 24  13° | 25 11° | 26 16° | 27 13° |
| 28 19° | 29 12° | 30 16° | 31 17° |
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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 day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 | Cloudy | 18° /11° | 0 mm | 4 | |
| Dec. 2 | Overcast | 15° /6° | 0 mm | 4 | |
| Dec. 3 | Cloudy | 15° /6° | 0 mm | 4 | |
| Dec. 4 | Sunny | 17° /6° | 0 mm | 5 | |
| Dec. 5 | Partly cloudy | 23° /7° | 0 mm | 6 | |
| Dec. 6 | Sunny | 23° /8° | 0 mm | 6 | |
| Dec. 7 | Partly cloudy | 19° /6° | 0 mm | 5 | |
| Dec. 8 | Cloudy | 19° /8° | 0 mm | 4 | |
| Dec. 9 | Partly cloudy | 18° /5° | 0 mm | 5 | |
| Dec. 10 | Sunny | 19° /6° | 0 mm | 5 | |
| Dec. 11 | Overcast | 18° /3° | 0 mm | 4 | |
| Dec. 12 | Overcast | 13° /5° | 0 mm | 3 | |
| Dec. 13 | Overcast | 13° /6° | 0 mm | 3 | |
| Dec. 14 | Moderate or heavy rain shower | 13° /6° | 14.1 mm | 3 | |
| Dec. 15 | Mist | 12° /2° | 0 mm | 3 | |
| Dec. 16 | Overcast | 16° /5° | 0 mm | 4 | |
| Dec. 17 | Partly cloudy | 19° /9° | 0 mm | 5 | |
| Dec. 18 | Partly cloudy | 22° /7° | 0 mm | 6 | |
| Dec. 19 | Overcast | 23° /9° | 0 mm | 5 | |
| Dec. 20 | Overcast | 14° /8° | 0 mm | 3 | |
| Dec. 21 | Overcast | 13° /7° | 0 mm | 3 | |
| Dec. 22 | Overcast | 18° /10° | 0 mm | 4 | |
| Dec. 23 | Mist | 17° /10° | 0 mm | 4 | |
| Dec. 24 | Light rain | 13° /6° | 12.3 mm | 3 | |
| Dec. 25 | Cloudy | 11° /5° | 0 mm | 3 | |
| Dec. 26 | Overcast | 16° /4° | 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 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.
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 💧
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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