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San Diego or somewhere close to it is likely the winner.
A place at the right elevation in Hawaii might be better though. Closest I can find to 70F highs year-round is HAWAII VOLCNS NP HQ 54 with highs ranging from 67 to 72F year-round. It's at 4000 feet.
Coastal Southern California has an average temperature of 70F year-round with high sunshine and low humidity/rainfall. Inland parts of SoCal are drier and sunnier though (no marine layer) with hotter summers and colder winters.
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