San Diego, December 12, 2025
San Diego is predicted to have a mild and dry winter in 2025, influenced by a weak La Niña event. The forecast suggests average temperatures of 66°F (19°C) during the day and minimal rainfall. While historical weather events show La Niña often brings drier conditions to Southern California, this year’s weak forecast indicates no significant shifts from typical winter weather patterns. The local economy can benefit from this stable weather forecast as businesses prepare for the season ahead.
San Diego, California
What to Expect from San Diego’s Winter Weather in 2025
San Diego is expected to experience a mild and dry winter season, with a 55% chance of a weak La Niña event influencing weather patterns from December 2025 through February 2026.
La Niña Forecast
The World Meteorological Organization (WMO) has predicted a 55% probability of a weak La Niña event during the upcoming winter months. La Niña is characterized by cooler-than-average sea surface temperatures in the central and eastern Pacific Ocean, which can influence global weather patterns. Despite the cooling effect, many regions, including San Diego, are anticipated to experience above-normal temperatures. The WMO emphasizes that accurate seasonal forecasts are essential for sectors like agriculture, energy, health, and transport, aiding in better preparedness and potentially reducing economic losses.
Impact on San Diego’s Winter Weather
Historically, La Niña conditions have brought drier and warmer conditions to Southern California. However, the expected weak nature of this event suggests that significant deviations from typical winter weather patterns are unlikely. San Diego is projected to have mild temperatures and minimal rainfall during the winter season. Average daytime temperatures are expected to be around 66°F (19°C), with nighttime lows near 46°F (8°C). The city typically receives about 1.5 inches (37 mm) of rainfall over approximately five days in December.
Recent Weather Events
In November 2025, San Diego County experienced its first major storm of the water year, bringing excessive rainfall and potential flooding. This event was part of a broader pattern of increased precipitation in the region. However, the current forecast indicates a return to drier conditions for the winter months.
Conclusion
While a weak La Niña event is expected to influence weather patterns in San Diego during the winter of 2025–2026, the anticipated impact is minimal. Residents can expect a mild and dry winter season, with temperatures and precipitation levels aligning closely with historical averages for the region. Understanding these weather patterns can greatly benefit local entrepreneurs and business owners, as they prepare for the seasonal changes. A stable weather forecast can provide opportunities for innovation and growth, paving the way for a dynamic local economy.
FAQ
What is La Niña?
La Niña refers to the periodic large-scale cooling of the ocean surface temperatures in the central and eastern equatorial Pacific Ocean, coupled with changes in the tropical atmospheric circulation, including changes in winds, pressure, and rainfall patterns.
How does La Niña affect San Diego’s weather?
Historically, La Niña conditions have brought drier and warmer conditions to Southern California. However, the expected weak nature of this event suggests that significant deviations from typical winter weather patterns are unlikely.
What are the expected temperatures in San Diego this winter?
Average daytime temperatures are expected to be around 66°F (19°C), with nighttime lows near 46°F (8°C).
How much rainfall does San Diego typically receive in December?
San Diego typically receives about 1.5 inches (37 mm) of rainfall over approximately five days in December.
When was the last major storm in San Diego County?
In November 2025, San Diego County experienced its first major storm of the water year, bringing excessive rainfall and potential flooding.
Key Features
| Feature | Details |
|---|---|
| La Niña Forecast | 55% chance of a weak La Niña event from December 2025 through February 2026. |
| Impact on San Diego | Minimal impact expected; mild and dry winter season anticipated. |
| Average Temperatures | Daytime highs around 66°F (19°C); nighttime lows near 46°F (8°C). |
| Average Rainfall | Approximately 1.5 inches (37 mm) over five days in December. |
| Recent Weather Events | First major storm of the water year in November 2025; return to drier conditions expected. |
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The SAN DIEGO STAFF WRITER represents the experienced team at HERESanDiego.com, your go-to source for actionable local news and information in San Diego, San Diego County, and beyond. Specializing in "news you can use," we cover essential topics like product reviews for personal and business needs, local business directories, politics, real estate trends, neighborhood insights, and state news affecting the area—with deep expertise drawn from years of dedicated reporting and strong community input, including local press releases and business updates. We deliver top reporting on high-value events such as Comic-Con International, San Diego County Fair, and San Diego Pride Festival. Our coverage extends to key organizations like the San Diego Regional Chamber of Commerce and United Way of San Diego County, plus leading businesses in biotechnology, healthcare, and technology that power the local economy such as Qualcomm, Illumina, and Scripps Health. As part of the broader HERE network, including HEREAnaheim.com, HEREBeverlyHills.com, HERECostaMesa.com, HERECoronado.com, HEREHollywood.com, HEREHuntingtonBeach.com, HERELongBeach.com, HERELosAngeles.com, HEREMissionViejo.com, and HERESantaAna.com, we provide comprehensive, credible insights into California's dynamic landscape.
