Posted in Web San Marcos, CA 10-Day Weather Forecast – The Weather Channel July 20, 2023 Be prepared with the most accurate 10-day forecast for San Marcos, CA with highs, lows, chance of precipitation from The Weather Channel and Weather.com https://weather.com/weather/tenday/l/San+Marcos+CA?canonicalCityId=26f60eae888fe1820d158e8709bdeb7ccc6afb9abff55a848a9180d8415a0e0e