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.
The climate of San Diego County in January is notably wet, with an average of 15 rainy days, and a total of 110.3 mm of precipitation.
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Temperatures
Rain 🌧️
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16
Dry days
15
Rainy days
0
Snow days
16°/11°
Temperatures
17 km/h
Avg max wind
61 %
Avg humidity
San Diego County Weather January
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| 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° |
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Temperatures trend during January in San Diego County
See the weather trend as well as the moving average line
January weather day by day
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| 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 | |
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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 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Diego County during January?
Significant rainfall exceeding 110.3 mm is expected in San Diego County during January, occurring over more than 15 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in San Diego County during January?
The average wind speed in San Diego County during January is 17 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 💧
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