Weather in San Diego in January
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for January in San Diego.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youSan Diego in January is pleasantly mild — daytime temperatures average 17.3°C, dropping to 8.3°C at night. The month is moderately rainy (6 rainy days), with roughly 8.7 hours of sunshine a day. This is peak season for good reason — conditions are close to ideal. 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 January
Search flights to San Diego
Compare 100+ airlines for January — 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 January
- Warm layers
- Light jacket or fleece
- Comfortable walking shoes
- Light waterproof layer
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 January a good time to visit San Diego?
January rates 10/10 for visiting San Diego — excellent time to visit. Expect average highs of 17.3°C, 64.6mm of rain across the month and about 8.7 hours of daily sunshine.
What is the temperature in San Diego in January?
In January, San Diego has average highs of 17.3°C (63.1°F) and average lows of 8.3°C (46.9°F).
Does it rain in San Diego in January?
Some rain is likely. San Diego averages 64.6mm across about 6 rainy days in January, so a light waterproof layer is worth packing.
What should I wear in San Diego in January?
For San Diego in January (17.3°C highs / 8.3°C lows), pack warm layers plus light jacket or fleece, comfortable walking shoes, light waterproof layer.
More essentials for San Diego in January
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.