With a population of around 21,200, Rancho San Diego sits in California, United States. The city operates in the Pacific Time Zone.
In 2025, Rancho San Diego recorded an average annual temperature of 65°F — about 0.5°F above the 30-year normal of 65°F. The hottest day reached 102°F in May; the coldest was 41°F in January. Total precipitation was 15 inches (wetter than usual). The wettest month was March.
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