Pack or skip
Flip-flops for San Diego in January
Verdict
Optional
Warm enough to wear in the evening or on the beach; not on a city walking day.
Why
San Diego in January averages highs of 66°F, lows of 49°F, 6 rainy days.
That climate makes flip-flops a judgment call. Warm enough to wear in the evening or on the beach; not on a city walking day.