Hurricanes
See also: List of California hurricanesSan Diego is only 3° further north than New Orleans, and technically within reach of East Pacific hurricanes. However, cold California Current off the coast of California keeps ocean water significantly colder than in the Gulf of Mexico and western Atlantic. As a result, virtually all northbound hurricanes dissipate over Baja California and fail to bring any precipitation to San Diego. The only tropical cyclone known to impact San Diego as a hurricane in around 200 years of record-keeping was the 1858 San Diego Hurricane. Two more cyclones managed to bring tropical storm-force winds to Southern California: the 1939 California tropical storm and the Hurricane Kathleen (1976).
Read more about this topic: Climate Of San Diego