San Diego Weather in January
“Mild and bright — an underrated time to visit.”
Roughly 6 rainy days across the month, on average.
January brings a calm, crisp charm to San Diego, offering a gentle respite from harsher winter climates. With daytime temperatures averaging a comfortable high of 18°C and an impressive 8.7 hours of daily sunshine, afternoons invite relaxed strolls along the waterfront without the intense summer heat.
Evenings bring a distinct chill as temperatures settle to an average low of 9.1°C, making warm layers essential once the sun dips below the Pacific horizon. While it is one of the region's damper months, bringing around 69mm of rainfall across roughly 6 rainy days, storms are typically brief and give way to clear, blue coastal skies.
What to pack for San Diego in January
- Mid-weight knit sweater or fleece jacket for cooler evenings
- Lightweight waterproof jacket or compact umbrella for occasional rain
- Cotton t-shirts and long-sleeve tops for comfortable layering
- Durable denim or casual long trousers
- Comfortable walking sneakers for exploring coastal trails and parks
- UV-blocking sunglasses for bright, sunny afternoons
What to pack for San Diego in January
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Where to stay in San Diego
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Compare hotels on Booking.com→Things worth doing
Spend sunny afternoons wandering the botanical gardens and historic architecture of Balboa Park. January is also a peak month for coastal whale watching from the bluffs of Point Loma, followed by an evening exploring the vibrant dining scene in the Gaslamp Quarter.
January vs. the rest of the year
How this month compares in San Diego. Tap any month to read more.
highlighted months are among the best time to visit.
Best time to visit San Diego
While January has its own character in San Diego, the data-backed best months to visit San Diego are April, June, July, August. These months combine the most favourable temperatures, rainfall, and sunshine across a ten-year climate record.
See the full best-time-to-visit guide for San DiegoOther places with a similar climate right now
San Diego in January — FAQ
Q01Is January a good time to visit San Diego?
Is January a good time to visit San Diego?
Yes — it is a good time to visit, with pleasant, comfortable weather. In January, San Diego averages a high of 18°C (64°F) and a low of 9°C (48°F), with 69mm of rainfall across roughly 6 rainy days.
Q02What is the average temperature in San Diego in January?
What is the average temperature in San Diego in January?
The average high temperature in San Diego during January is 18°C (64°F), with an average low of 9°C (48°F). These figures are averaged from ten years of daily records (2015–2024, Open-Meteo Archive).
Q03How many rainy days does San Diego have in January?
How many rainy days does San Diego have in January?
San Diego averages approximately 6 rainy days in January, with a total monthly rainfall of about 69mm. This is based on daily precipitation records where days with 1mm or more of rain are counted as rainy days.
Q04What should I pack for San Diego in January?
What should I pack for San Diego in January?
For San Diego in January, pack layered clothing for changing temperatures, a merino base layer for evenings, a compact umbrella or waterproof jacket, comfortable walking shoes. These recommendations are based on the ten-year weather averages for this specific month.
Q05How crowded is San Diego in January?
How crowded is San Diego in January?
Tourist crowds in San Diego during January are typically moderate. Consider this when planning accommodation — prices track crowd levels closely.