Pack or skip
Flip-flops for San Diego in May
Verdict
Optional
Warm enough to wear in the evening or on the beach; not on a city walking day.
Why
San Diego in May averages highs of 73°F, lows of 61°F, 1 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.