San Diego County (San Diego)
January
Weather in San Diego County, California for January 2027
Your guide to San Diego County weather in January - trends and predictions
In general, the average temperature in San Diego County at the beginning of January is 15.8 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 17.2 °C by the end of January.
San Diego County experiences moderate rainfall in January, with an average of 7 rainy days and a total precipitation of 90.6 mm.
Is January a good time to visit San Diego County? check out the best time to travel to San Diego County page.
✨ Is January a good time to visit San Diego County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
24
Dry days
7
Rainy days
0
Snow days
17°/10°
Temperatures
15 km/h
Avg max wind
62 %
Avg humidity
San Diego County Weather January
Move between months or click on a day
Temperatures trend during January in San Diego County
See the weather trend as well as the moving average line
January weather in San Diego County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Moderate rain | 16° /12° | 23.9 mm | 3 | |
| Jan. 2 |  Light rain | 16° /12° | 3 mm | 3 | |
| Jan. 3 | Light rain | 15° /12° | 3.4 mm | 3 | |
| Jan. 4 |  Patchy rain possible | 15° /12° | 1.7 mm | 3 | |
| Jan. 5 |  Moderate or heavy rain shower | 17° /11° | 9.8 mm | 3.2 | |
| Jan. 6 |  Sunny | 17° /11° | 0 mm | 3.2 | |
| Jan. 7 | Patchy rain possible | 15° /12° | 1.3 mm | 3 | |
| Jan. 8 |  Partly cloudy | 16° /10° | 0 mm | 3.3 | |
| Jan. 9 | Sunny | 17° /8° | 0.1 mm | 3.3 | |
| Jan. 10 | Light rain | 18° /9° | 5.4 mm | 3.3 | |
| Jan. 11 | Sunny | 18° /10° | 0.3 mm | 3.3 | |
| Jan. 12 | Sunny | 18° /9° | 0 mm | 3.4 | |
| Jan. 13 | Sunny | 19° /9° | 0 mm | 3.4 | |
| Jan. 14 | Moderate or heavy rain shower | 18° /10° | 7.1 mm | 3.4 | |
| Jan. 15 | Light rain | 18° /10° | 3.1 mm | 3.5 | |
| Jan. 16 | Light rain | 16° /10° | 6.7 mm | 3 | |
| Jan. 17 | Patchy rain possible | 16° /10° | 1.4 mm | 3 | |
| Jan. 18 | Partly cloudy | 17° /11° | 0 mm | 3.6 | |
| Jan. 19 | Patchy rain possible | 17° /10° | 0.2 mm | 3 | |
| Jan. 20 | Light rain | 16° /11° | 3.4 mm | 3 | |
| Jan. 21 | Patchy rain possible | 16° /10° | 1.8 mm | 3.7 | |
| Jan. 22 | Light rain | 16° /10° | 3.4 mm | 3 | |
| Jan. 23 | Light rain | 17° /12° | 3.6 mm | 3.8 | |
| Jan. 24 | Sunny | 16° /10° | 0 mm | 3.8 | |
| Jan. 25 |  Overcast | 16° /9° | 0.1 mm | 3 | |
| Jan. 26 | Sunny | 18° /11° | 0 mm | 3.9 | |
| Jan. 27 | Light rain | 18° /9° | 5.1 mm | 4 | |
| Jan. 28 |  Cloudy | 16° /11° | 0 mm | 4 | |
| Jan. 29 | Overcast | 17° /11° | 0.9 mm | 3 | |
| Jan. 30 | Light rain | 18° /11° | 4.9 mm | 4 | |
| Jan. 31 | Sunny | 19° /11° | 0 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for San Diego County in January 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.
Change Month
San Diego County in January - FAQ
What are the expected maximum and minimum temperatures in San Diego County during January?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Diego County during January?
Moderate rainfall is anticipated in San Diego County during January, with a total of 90.6 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in San Diego County during January?
The average wind speed in San Diego County during January is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
January rainfall patterns in San Diego County
Explore the daily rainfall trends and prepare for San Diego Countys January weather 💧
Typically, San Diego County has 7 rainy days in January with a total of 90.6 mm of rainfall.
Top locations in San Diego County
Select a location for an accurate weather forecast
More Locations Quick links
More San Diego County weather pages
You are here
Found a mistake?
We appreciate your attention to details. Tell us here.