Weather

San Diego Weather in December

San Diego weather in December features mild temperatures with highs in the 60s°F and lows in the 50s°F. Explore key seasonal events, tips for visiting, and why December is great option for visiting San Diego.

by Mac Douglass

Updated February 19, 2025

What Is the Weather Like in San Diego in December?

San Diego weather in December offers a mild winter experience that’s far from typical. Average high temperatures hover around the mid-60s°F (18-20°C), while nighttime lows dip into the high 40s°F (around 9°C), particularly late at night or early in the morning. While the weather remains mild, rain showers are common, making December one of the city's wetter months.

If you’re hoping for a beach vacation, December might not be the best time, as ocean waters cool significantly. Most locals skip the shorelines during this period. However, December is perfect for enjoying outdoor events and seasonal activities thanks to the pleasant daytime weather.

Average December Weather in San Diego

San Diego's December weather features mild highs around 65-67°F and cooler lows near 50°F, making it perfect for outdoor activities and seasonal events. Data from WeatherSpark.

Daytime Temperatures: Average highs reach around 67°F early in December and drop slightly to 65°F by Christmas Day.
Nighttime Temperatures: Lows average 51°F early in the month, cooling to about 50°F as December progresses.
Rainfall: December is one of San Diego’s wetter months, so pack an umbrella for unexpected showers.

December San Diego Weather Compared to Other Months

Month	Average High (°F)	Average Low (°F)	Days with Precipitation	Hours of Sunshine	Average Precipitation (in)
January	65	48	6	217	1.53
February	76	65	1	255	0.15
March	73	61	3	234	0.57
April	69	54	4	236	1.01
May	76	67	0	277	0.02
June	75	65	0	293	0.03
July	71	62	1	253	0.07
August	69	59	2	261	0.12
September	67	56	5	242	0.78
October	66	53	7	262	1.81
November	65	51	7	212	2.27
December	65	49	7	216	1.98

San Diego's weather in December is among the coolest of the year, with average highs in the mid-60s°F and lows around 50°F.

Compared to warmer months like July, where average highs can reach the low-70s°F, December offers a refreshing change. While rainfall is more common in December than in summer, the mild climate still makes it an ideal time to explore the city’s outdoor attractions.

Things to Do in San Diego in December

San Diego's December weather may not be ideal for beachgoers, but the city’s vibrant seasonal activities more than make up for it.

San Diego Bay Parade of Lights: Watch dazzling boats light up the harbor in a holiday tradition that draws locals and visitors alike.
Balboa Park December Nights: Explore San Diego’s cultural heart during this festive two-day event, featuring food, entertainment, and free museum access.
Whale Watching Excursions: December marks the start of gray whale migration season, offering unforgettable ocean experiences.

Why Visit San Diego in December?

San Diego’s December weather offers a unique opportunity to enjoy the city without summer crowds. Hotel rates are often more affordable, and the cooler temperatures make it easier to explore the city’s iconic attractions like Balboa Park, Old Town, and the Gaslamp Quarter.

Whether you’re planning to attend seasonal events, enjoy a whale-watching adventure, or simply take in the city’s mild winter charm, San Diego in December is an ideal destination for a laid-back getaway.

Plan Your Trip Around the December Weather in San Diego, California

December weather in San Diego provides cool mornings, pleasant afternoons, and occasional rain showers. If you’re looking for a winter escape that offers a mix of outdoor activities and festive events, San Diego should be at the top of your list.