San Diego County (San Diego)
January
Weather in San Diego County for January 2026
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 16 °F. As the month progressed, temperatures tended to remain steady, reaching an average of 16 °F by the end of January.
San Diego County in January brings notable rainfall, with an average of 16 rainy days and a total precipitation of 81.5 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
15
Dry days
16
Rainy days
0
Snow days
16°/10°
Temperatures
16 km/h
Avg max wind
58 %
Avg humidity
San Diego County Weather January
Move between months or click on a day
| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  16° | 2  16° | 3 15° | ||||
| 4  15° | 5 18° | 6  17° | 7  15° | 8 17° | 9 17° | 10 17° |
| 11  16° | 12 17° | 13 17° | 14 17° | 15 17° | 16 16° | 17 14° |
| 18 15° | 19 14° | 20 16° | 21 16° | 22 16° | 23 18° | 24 17° |
| 25 15° | 26 17° | 27 17° | 28 16° | 29 15° | 30 16° | 31 16° |
You can click on date
Access San Diego County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during January in San Diego County
See the weather trend as well as the moving average line
January weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 | Moderate or heavy rain shower | 16° /10° | 9.5 mm | 4 | |
| Jan. 2 | Partly cloudy | 16° /11° | 0.7 mm | 4 | |
| Jan. 3 | Moderate rain at times | 15° /11° | 4.6 mm | 3 | |
| Jan. 4 | Patchy rain possible | 15° /11° | 1.1 mm | 4 | |
| Jan. 5 | Moderate or heavy rain shower | 18° /10° | 4.8 mm | 5 | |
| Jan. 6 | Sunny | 17° /9° | 0 mm | 5 | |
| Jan. 7 | Overcast | 15° /11° | 1.7 mm | 3 | |
| Jan. 8 | Partly cloudy | 17° /10° | 0 mm | 5 | |
| Jan. 9 | Sunny | 17° /9° | 0.1 mm | 5 | |
| Jan. 10 | Moderate or heavy rain shower | 17° /10° | 7.2 mm | 5 | |
| Jan. 11 | Cloudy | 16° /10° | 0.5 mm | 4 | |
| Jan. 12 | Sunny | 17° /8° | 0 mm | 5 | |
| Jan. 13 | Overcast | 17° /8° | 0 mm | 5 | |
| Jan. 14 | Moderate or heavy rain shower | 17° /10° | 9.5 mm | 5 | |
| Jan. 15 | Moderate rain at times | 17° /9° | 4.1 mm | 5 | |
| Jan. 16 | Moderate or heavy rain shower | 16° /10° | 8.9 mm | 4 | |
| Jan. 17 | Patchy rain possible | 14° /10° | 1.9 mm | 4 | |
| Jan. 18 | Partly cloudy | 15° /10° | 0 mm | 4 | |
| Jan. 19 | Patchy rain possible | 14° /9° | 0.3 mm | 3 | |
| Jan. 20 | Patchy rain possible | 16° /11° | 4.5 mm | 4 | |
| Jan. 21 | Sunny | 16° /9° | 2.4 mm | 5 | |
| Jan. 22 | Sunny | 16° /9° | 4.5 mm | 4 | |
| Jan. 23 | Sunny | 18° /11° | 0.6 mm | 5 | |
| Jan. 24 | Sunny | 17° /9° | 0 mm | 5 | |
| Jan. 25 | Overcast | 15° /9° | 0.1 mm | 4 | |
| Jan. 26 | Sunny | 17° /11° | 0 mm | 5 | |
| Jan. 27 | Sunny | 17° /10° | 6.8 mm | 5 | |
| Jan. 28 | Cloudy | 16° /11° | 0 mm | 4 | |
| Jan. 29 | Overcast | 15° /12° | 1.2 mm | 4 | |
| Jan. 30 | Moderate or heavy rain shower | 16° /11° | 6.5 mm | 4 | |
| Jan. 31 | Partly cloudy | 16° /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.
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 16° 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 81.5 mm spread over approximately 16 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 16 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 💧
Top locations in San Diego County
Select a location for an accurate weather forecast
More Locations Quick links
You are here
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.
Found a mistake?
We appreciate your attention to details. Tell us here.