First recorded by Joe Jones (US #89 1961).
Hit version by The Rivieras (US #5 1964).
From the wiki: “‘California Sun’, is a song credited to Henry Glover and Morris Levy. Originally recorded by the 35-year-old New Orleans-born singer-songwriter Joe Jones, and released by Roulette Records in the winter of 1961, it peaked at #89 on the charts. The most successful version, the Rivieras’ cover, recorded in 1964, reached #5 in the U.S. Billboard Hot 100 chart.”
The Rivieras, “California Sun” (1964):