What to Expect from San Diego in December
You won't find a white Christmas in San Diego unless you head for the mountains, but December is in the rainy season, and all of the monthly rainfall often comes all on the same day, especially during winter storms.
More About: San Diego in the Winter
San Diego Weather in December
Average High Temperature: 65°F/18°C
Average Low Temperature: 48°F/9°C
Rain & Clouds Index: 1.53 inches (3.9 cm) rain, 73% sunshine
What to Pack, What to Wear in December
Pack an umbrella or rain jacket with hood for rainy days and a warm jacket if no rain is predicted. You won't need a heavy winter coat. Long-sleeved shirts and sweaters in layers work best.
San Diego December Events
- Christmas in San Diego: Guide to the best Christmas celebrations, parades, pageants, concerts and holiday activities in San Diego
- San Diego County Credit Union Poinsettia Bowl: Held just before Christmas, it matches a team from the Mountain West Conference against an at-large opponent.
Especially Fun in DecemberThe day after it rains, skies are sometimes exceptionally clear and great for photography.
If precipitation happens, try these Things to Do on a Rainy Day in San Diego
San Diego whale watching season runs from December through March. Use the San Diego whale watching guide to learn more about California whale-watching and San Diego excursions.
Averages and Reality
The weather information we've given above is best used as a general idea of what things may be like. The only rain all summer could fall on your perfect picnic or a winter day could be so warm you'll wish you packed your shorts.
Averages are helpful for planning ahead, but don't count on your trip being "average." Check the San Diego weather forecast before you leave home.