Weather in San Diego in December
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Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youIn December, San Diego sees average highs of 17.9°C (64.2°F) and lows of 8.9°C. Conditions are pleasantly mild and moderately rainy (6 rainy days), with roughly 8.0 hours of sunshine a day. It is one of the best months of the year to visit. For the complete picture, see the best time to visit San Diego — every month compared. Once you know when to go, find your San Diego packing list at 247PackingList.
Get ready for San Diego in December
Search flights to San Diego
Compare 100+ airlines for December — one search, best price.
Search Flights →Hot-weather travel clothing
Sun protection, lightweight layers and a reusable water bottle are essential here.
Check Price →What to pack for San Diego in December
- Warm layers
- Light jacket or fleece
- Comfortable walking shoes
Compare all months in San Diego
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 17.3°C | 64.6mm | 10/10 |
| February | 18.1°C | 30.5mm | 10/10 |
| March | 17.2°C | 81.3mm | 10/10 |
| April | 19.2°C | 30.3mm | 10/10 |
| May | 20.3°C | 5.3mm | 10/10 |
| June | 22.1°C | 3.5mm | 10/10 |
| July | 24.1°C | 6.1mm | 10/10 |
| August | 25.5°C | 11.2mm | 10/10 |
| September | 25.6°C | 17.5mm | 10/10 |
| October | 23.9°C | 8.8mm | 10/10 |
| November | 21.1°C | 26.8mm | 10/10 |
| December | 17.9°C | 44.4mm | 10/10 |
Full month-by-month guide: best time to visit San Diego →
For facts about United States — currency, language and dialling code — see our United States country guide at 247CountryInfo. Travellers also find it useful to keep a San Diego travel guide to hand. Check clothing sizes in United States before you shop.
Frequently Asked Questions
Is December a good time to visit San Diego?
December rates 10/10 for visiting San Diego — excellent time to visit. Expect average highs of 17.9°C, 44.4mm of rain across the month and about 8.0 hours of daily sunshine.
What is the temperature in San Diego in December?
In December, San Diego has average highs of 17.9°C (64.2°F) and average lows of 8.9°C (48.0°F).
Does it rain in San Diego in December?
Not much. December averages just 44.4mm of rain in San Diego — the odd shower is possible but most days stay dry.
What should I wear in San Diego in December?
For San Diego in December (17.9°C highs / 8.9°C lows), pack warm layers plus light jacket or fleece, comfortable walking shoes.
More essentials for San Diego in December
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.