Business Casual
White Linen Blazer Day
A white linen blazer over matching wide-leg linen trousers and a blue collarless blouse stays entirely polished through warm rain. Slide sandals and gold aviators make it feel like summer despite the drizzle.
What to Wear in San Diego in December
December in San Diego is mild and partly sunny, with highs averaging 66°F and cool nights near 50°F — light layers and a medium-weight jacket are all most days require. The Gaslamp Quarter, Balboa Park, and the Torrey Pines State Reserve are all pleasant for outdoor exploration without the summer beach crowds. About 5 days bring rain, usually as Pacific winter systems rather than all-day downpours.
What to wear
top / Short-Sleeve Top
classic tee
bottom / Jeans
straight-leg
chinos for a slightly smarter look
footwear / Waterproof Boots
ankle boots
rubber sole for traction — keep feet dry all day
outerwear / Rain Jacket
shell jacket
waterproof or DWR-treated — keep it packable
Consider bringing:
UmbrellaSunglasses
Based on typical December conditions in San Diego. Weather varies year to year — check the live forecast when you're within two weeks of your trip.
San Diego's December is the beginning of what locals call 'sweater weather' — a relative term in a city where the thermometer rarely dips below 50°F. Highs reach 66°F, making afternoons comfortable for Balboa Park's museums and gardens, the Embarcadero, and the Torrey Pines trails above the Pacific. Rain is possible on about 5 days, typically arriving as fast-moving Pacific systems that drop meaningful precipitation before clearing. The marine layer, while less persistent than June, still occasionally rolls in from the ocean overnight and lingers into mid-morning. The local style tendency runs effortlessly coastal — light denim, linen or cotton layers, and comfortable sneakers or sandals for daytime, with a flannel or light knit for evenings in the Gaslamp Quarter's restaurants and bars. A medium-weight jacket handles the 16°F gap between daytime highs and overnight lows. Visitors from colder climates often find December in San Diego genuinely warm; visitors from Southern California cities find it requires an actual jacket — both reactions are appropriate.
Curated Looks
Casual
Linen Under Rain Jacket
A black rain jacket over ivory linen trousers refuses to look sloppy in warm rain. Espadrilles and a crochet bucket hat keep the warm-weather mood alive below the waterline.
Chic
Blush Jacket Tortoise
A blush cropped jacket over a white linen blouse and ivory wide-leg trousers refuses to look heavy in warm rain. Tortoiseshell cat-eye sunglasses are the editorial punctuation.
Cozy
Parka and the Ivory Mules
A black longline parka over a crewneck sweatshirt in warm rain has a deliberateness that works. Ivory satin mules and a cream beanie are the contrasts that make it.
Cute
Double Denim Rainy Day
A light wash denim jacket over a denim mini skirt makes a strong case for double denim in warm rain. The black square neck top underneath adds structure.
Formal
Black Blazer Pleated Rain
A black blazer over an ivory blouse and pleated maxi skirt in warm rain is complete formal coverage. Black mule heels are the practical formal choice when espadrilles are off the table.
Sporty
Yellow Jacket Biker
A yellow hooded rain jacket over biker shorts and a longline tee handles warm rain with high-visibility attitude. Ivory pointed-toe mules are the surprising finishing note.
Packing List
What to Pack for San Diego in December →
Other Months in San Diego
Frequently Asked Questions
What should I wear in San Diego in December?+
Light-to-medium layers cover the full range comfortably. A flannel, light sweater, or long-sleeve top handles the 50°F evenings in the Gaslamp Quarter; add a medium-weight jacket for the occasional 45°F morning marine layer. Jeans and comfortable sneakers or low boots work for Balboa Park, the Embarcadero, and most of the city's outdoor attractions. Leave the heavy parka at home — it's genuinely unnecessary.
Is December a good time to visit San Diego?+
December is an excellent time to visit San Diego. Crowds are lighter than summer, hotel rates are lower outside the holiday week peak, and the weather is mild enough for comfortable outdoor exploration. Balboa Park's gardens are in their off-season quiet, Torrey Pines State Reserve trails are accessible without the summer heat, and the Gaslamp Quarter's restaurant scene is in full swing. The main risk is Pacific rain systems, which are less predictable than the summer fog pattern.
What shoes are best for San Diego in December?+
Comfortable sneakers or casual ankle boots handle most of San Diego's December terrain — the Embarcadero's flat promenade, Balboa Park's paved paths, and the Gaslamp Quarter's walkable blocks. For the Torrey Pines State Reserve trails, a trail runner or hiking sneaker provides better grip on the sandy coastal paths, particularly after rain. Sandals are still viable on dry afternoons, especially near the beach communities of La Jolla and Ocean Beach.
How cool does it get in San Diego in December?+
Daytime highs average 66°F — genuinely mild and suitable for outdoor activity without a heavy coat. Overnight lows average 50°F, with occasional drops to the mid-40s during stronger Pacific systems. The marine layer can make mornings feel cooler and damper than the temperature suggests, particularly in coastal neighborhoods like La Jolla and Ocean Beach. About 5 days bring measurable rain.
What should I pack for San Diego in December?+
Pack light layers: jeans, long-sleeve tops, a sweater or light fleece, and a medium-weight jacket for evenings and marine layer mornings. A compact rain jacket or water-resistant layer covers the occasional Pacific rain system. Comfortable sneakers or casual boots handle most of the city's terrain. Sunscreen is still worth packing — San Diego's UV index remains moderate even in December on clear days.