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Living in San Marcos, summers are intense — Aug highs average 96.0°F, while winters are cool, with Feb lows hovering around 43.4°F. At just 1125 heating degree days per year, home heating costs are minimal. The area receives 45.9 inches of rainfall per year. Median household income: $47,394. With a 27.7% poverty rate and 28.9% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 41 over the past week.
Updated August 17, 2026.
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