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Weather in San Luis Obispo County for December 2025

Your guide to San Luis Obispo County weather in December - trends and predictions

    Temperatures

  • 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.

  • Rain 🌧️

  • With an average of 3 rainy days, San Luis Obispo County experiences minimal rainfall in December.

  • More

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Average dry days
28
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/6°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
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 day by day

Click on a date for more information
Date Weather Temperatures Rain UV More
Dec. 1 Cloudy
Cloudy
18° /11° 0 mm 4
Dec. 2 Overcast
Overcast
15° /6° 0 mm 4
Dec. 3 Cloudy
Cloudy
15° /6° 0 mm 4
Dec. 4 Sunny
Sunny
17° /6° 0 mm 5
Dec. 5 Partly cloudy
Partly cloudy
23° /7° 0 mm 6
Dec. 6 Sunny
Sunny
23° /8° 0 mm 6
Dec. 7 Partly cloudy
Partly cloudy
19° /6° 0 mm 5
Dec. 8 Cloudy
Cloudy
19° /8° 0 mm 4
Dec. 9 Partly cloudy
Partly cloudy
18° /5° 0 mm 5
Dec. 10 Sunny
Sunny
19° /6° 0 mm 5
Dec. 11 Overcast
Overcast
18° /3° 0 mm 4
Dec. 12 Overcast
Overcast
13° /5° 0 mm 3
Dec. 13 Overcast
Overcast
13° /6° 0 mm 3
Dec. 14 Moderate or heavy rain shower
Moderate or heavy rain shower
13° /6° 14.1 mm 3
Dec. 15 Mist
Mist
12° /2° 0 mm 3
Dec. 16 Overcast
Overcast
16° /5° 0 mm 4
Dec. 17 Partly cloudy
Partly cloudy
19° /9° 0 mm 5
Dec. 18 Partly cloudy
Partly cloudy
22° /7° 0 mm 6
Dec. 19 Overcast
Overcast
23° /9° 0 mm 5
Dec. 20 Overcast
Overcast
14° /8° 0 mm 3
Dec. 21 Overcast
Overcast
13° /7° 0 mm 3
Dec. 22 Overcast
Overcast
18° /10° 0 mm 4
Dec. 23 Mist
Mist
17° /10° 0 mm 4
Dec. 24 Light rain
Light rain
13° /6° 12.3 mm 3
Dec. 25 Cloudy
Cloudy
11° /5° 0 mm 3
Dec. 26 Overcast
Overcast
16° /4° 0 mm 4
Dec. 27 Light rain
Light rain
13° /9° 3.7 mm 3
Dec. 28 Overcast
Overcast
19° /5° 0 mm 4
Dec. 29 Mist
Mist
12° /6° 0 mm 3
Dec. 30 Sunny
Sunny
16° /6° 0 mm 5
Dec. 31 Sunny
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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Location coordinates 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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