Lakeport, like all of the Clear Lake area, has hot, mostly dry summers and cool, wet winters. The average January temperatures are a maximum of and a minimum of . The average July temperatures are a maximum of and a minimum of . There are an average of 77.5 days with highs of or higher and an average of 75.5 days with lows of . The record high temperature was on August 10, 1971, and September 13, 1972. The record low temperature was on December 9, 1972. Its climate can be classified as hot-summer Mediterranean climate according to the Köppen climate classification system.