Original: They rarely rise above 24 ° C ( 75 ° F ) in near-shore southern California , and usually do n't get above 17 ° C ( 63 ° F ) along most of the rest of the coast and outer coastal waters , although El Niño events may warm the waters somewhat .
Simplified: NOAA Tropical Cyclone FAQ Normally , the waters ' temperatures do n't get above 17 ° C ( 63 ° F ) , although El Nino effects may sometimes warm the waters a little bit .