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 16 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 17.4 °C by the end of January.
San Diego County in January brings notable rainfall, with an average of 17 rainy days and a total precipitation of 90.6 mm.
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Temperatures
Rain 🌧️
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14
Dry days
17
Rainy days
0
Snow days
17°/10°
Temperatures
15 km/h
Avg max wind
61 %
Avg humidity
San Diego County Weather January
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Temperatures trend during January in San Diego County
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January weather in San Diego County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Moderate or heavy rain shower | 16° /12° | 23.9 mm | 3 | |
| Jan. 2 |  Partly cloudy | 16° /12° | 3 mm | 3 | |
| Jan. 3 | Moderate rain at times | 16° /12° | 3.4 mm | 3 | |
| Jan. 4 |  Patchy rain possible | 15° /11° | 1.7 mm | 3 | |
| Jan. 5 | Moderate or heavy rain shower | 17° /11° | 9.8 mm | 4 | |
| Jan. 6 |  Sunny | 17° /10° | 0 mm | 4 | |
| Jan. 7 |  Overcast | 15° /11° | 1.3 mm | 3 | |
| Jan. 8 | Partly cloudy | 16° /10° | 0 mm | 4 | |
| Jan. 9 | Sunny | 17° /8° | 0.1 mm | 4 | |
| Jan. 10 | Sunny | 18° /9° | 5.4 mm | 4 | |
| Jan. 11 | Sunny | 18° /10° | 0.3 mm | 4 | |
| Jan. 12 | Sunny | 19° /8° | 0 mm | 4 | |
| Jan. 13 | Sunny | 19° /8° | 0 mm | 4 | |
| Jan. 14 | Moderate or heavy rain shower | 18° /9° | 7.1 mm | 4 | |
| Jan. 15 | Moderate rain at times | 18° /9° | 3.1 mm | 4 | |
| Jan. 16 | Partly cloudy | 16° /10° | 6.7 mm | 3 | |
| Jan. 17 |  Cloudy | 16° /9° | 1.4 mm | 3 | |
| Jan. 18 | Partly cloudy | 15° /10° | 0 mm | 4 | |
| Jan. 19 | Patchy rain possible | 17° /9° | 0.2 mm | 3 | |
| Jan. 20 | Patchy rain possible | 16° /10° | 3.4 mm | 3 | |
| Jan. 21 | Sunny | 16° /9° | 1.8 mm | 4 | |
| Jan. 22 | Sunny | 16° /10° | 3.4 mm | 3 | |
| Jan. 23 | Sunny | 17° /11° | 3.6 mm | 4 | |
| Jan. 24 | Sunny | 17° /10° | 0 mm | 4 | |
| Jan. 25 | Overcast | 16° /8° | 0.1 mm | 3 | |
| Jan. 26 | Sunny | 18° /10° | 0 mm | 4 | |
| Jan. 27 | Sunny | 18° /9° | 5.1 mm | 4 | |
| Jan. 28 | Cloudy | 16° /10° | 0 mm | 4 | |
| Jan. 29 | Overcast | 17° /10° | 0.9 mm | 3 | |
| Jan. 30 | Sunny | 18° /10° | 4.9 mm | 4 | |
| Jan. 31 | Sunny | 19° /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.
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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 17 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 17 rainy days in January with a total of 90.6 mm of rainfall.
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