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Weather in San Diego County, California for December 2025

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

    Official Weather Alert ⚠️

  • Wind Advisory - See hour by hour.

    • Temperatures

  • Until now, December 2025 in San Diego County has been nearly identical to the historical average, with a temperature of 18.1 °F (showing only a slight deviation of 0.1 °F).

  • An exceptional deviation from the historical average is forecasted for next days of December 2025 in San Diego County with the forecasted temperature being 19.2 °F, much lower than usual.

  • In general, the average temperature in San Diego County at the beginning of December is 17.9 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 19.4 °F by the end of December.

    • Rain 🌧️

  • San Diego County experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 16 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
24
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/12°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
62 %
Avg humidity

San Diego County Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
19°
2
Cloudy
17°
3
Sunny
16°
4
Cloudy
18°
5
Partly cloudy
19°
6
Partly cloudy
19°
7
Partly cloudy
17°
8
Partly cloudy
17°
9
Partly cloudy
20°
10
Sunny
22°
11
Overcast
19°
12
Cloudy
16°
13
Sunny
17°
14
Partly cloudy
18°
15
Sunny
18°
16
Sunny
19°
17
Overcast
18°
18
Partly cloudy
22°
19
Partly cloudy
18°
20
Cloudy
17°
21
Cloudy
17°
22
Cloudy
17°
23
Sunny
17°
24
Sunny
18°
25
Partly cloudy
19°
26
Cloudy
18°
27
Overcast
15°
28
Patchy rain possible
18°
29
Overcast
16°
30
Weather Alert Sunny
30°
31
Overcast
20°

Temperatures trend during December in San Diego County

See the weather trend as well as the moving average line

December weather in San Diego County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
Dec. 1 Overcast
Overcast
 19° /10° 0 mm 5
Dec. 2 Cloudy
Cloudy
 17° /9° 0 mm 4
Dec. 3 Sunny
Sunny
 16° /10° 0 mm 4
Dec. 4 Cloudy
Cloudy
 18° /9° 0 mm 4
Dec. 5 Partly cloudy
Partly cloudy
 19° /9° 0 mm 5
Dec. 6 Partly cloudy
Partly cloudy
 19° /11° 0 mm 5
Dec. 7 Partly cloudy
Partly cloudy
 17° /10° 0 mm 5
Dec. 8 Partly cloudy
Partly cloudy
 17° /10° 0 mm 5
Dec. 9 Partly cloudy
Partly cloudy
 20° /9° 0 mm 6
Dec. 10 Sunny
Sunny
 22° /11° 0 mm 6
Dec. 11 Overcast
Overcast
 19° /12° 0 mm 4
Dec. 12 Cloudy
Cloudy
 16° /11° 0 mm 4
Dec. 13 Sunny
Sunny
 17° /12° 0 mm 4
Dec. 14 Partly cloudy
Partly cloudy
 18° /12° 0 mm 5
Dec. 15 Sunny
Sunny
 18° /12° 0 mm 5
Dec. 16 Sunny
Sunny
 19° /11° 0 mm 5
Dec. 17 Overcast
Overcast
 18° /12° 0 mm 4
Dec. 18 Partly cloudy
Partly cloudy
 22° /12° 0 mm 6
Dec. 19 Partly cloudy
Partly cloudy
 18° /12° 0.6 mm 5
Dec. 20 Cloudy
Cloudy
 17° /12° 1 mm 4
Dec. 21 Cloudy
Cloudy
 17° /12° 0.6 mm 3
Dec. 22 Cloudy
Cloudy
 17° /11° 3.8 mm 3
Dec. 23 Sunny
Sunny
 17° /12° 0 mm 4
Dec. 24 Sunny
Sunny
 18° /13° 9.5 mm 3
Dec. 25 Partly cloudy
Partly cloudy
 19° /13° 6.6 mm 4
Dec. 26 Cloudy
Cloudy
 18° /12° 0 mm 4
Dec. 27 Overcast
Overcast
 15° /11° 1.6 mm 3
Dec. 28 Patchy rain possible
Patchy rain possible
 18° /10° 2.2 mm 4
Dec. 29 Overcast
Overcast
 16° /10° 0 mm 3
Dec. 30 Sunny
Sunny
 30° /14° 0 mm 0.6
Dec. 31 Overcast
Overcast
 20° /16° 0 mm 0.6
Next
Important Notice
Our weather forecast for San Diego 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 Diego County forecast closer to your planned date for the most up-to-date weather information.
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San Diego County in December - FAQ

What are the expected maximum and minimum temperatures in San Diego County during December?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Diego County during December?
Expect minimal rainfall in San Diego County during December, with a total of 16 mm over approximately 7 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in San Diego County during December?
The average wind speed in San Diego County during December is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in San Diego County

Explore the daily rainfall trends and prepare for San Diego Countys December weather 💧
Typically, San Diego County has 7 rainy days in December with a total of 16 mm of rainfall.

UV exposure in San Diego County during December

Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
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Chula VistaEscondidoOceansideSan Diego
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Location coordinates Where is San Diego County?

Get accurate weather forecasts for San Diego County, located at latitude 32.716 and longitude -117.165. Stay updated with localized weather information tailored for San Diego County.

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