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City of San Marcos, CASan Marcos, CA 7-Day Night Weather Forecast
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San Marcos, CA Weather Forecast
San Marcos, CA Weather Forecast Date: 1221 AM PDT Thu Aug 06 2026
The area/counties/county of: San Diego County Valleys, including the cities of: Escondido, El Cajon, San Marcos, La Mesa, Santee, and Poway.or toggle through each period.
Today... Partly cloudy this morning...Becoming mostly sunny. Highs 84 to 89 in the western valleys to 90 to 95 near the foothills. Areas of winds west to 10 mph...Becoming 10 to 15 mph this afternoon.
Tonight... Mostly clear in the evening...Becoming partly cloudy overnight with patchy fog. Lows 63 to 67. Areas of winds west to 10 mph in the evening becoming light.
Friday... Partly cloudy with patchy fog in the morning...Becoming sunny. Highs 85 to 89 in the western valleys to 91 to 96 near the foothills. Areas of winds west to 10 mph...Becoming 10 to 15 mph in the afternoon.
Friday Night... Clear in the evening...Becoming partly cloudy overnight with patchy fog. Lows 63 to 68. Areas of winds west to 10 mph in the evening becoming light.
Saturday... Partly cloudy with patchy fog in the morning... Becoming mostly sunny. Highs 85 to 90 in the western valleys to 94 to 99 near the foothills. Light winds becoming west 10 mph in the afternoon.
Saturday Night... Mostly clear. Patchy fog overnight. Lows 64 to 70.
Sunday... Partly cloudy with patchy fog in the morning...Becoming mostly sunny. Highs 86 to 90 in the western valleys to 94 to 99 near the foothills.
Sunday Night... Partly cloudy. Lows 64 to 69.
Monday... Partly cloudy in the morning...Becoming mostly sunny. Highs 84 to 89 in the western valleys to 90 to 95 near the foothills.
Monday Night... Mostly clear. Lows 63 to 67.
Tuesday... Partly cloudy. Highs 84 to 88 in the western valleys to 88 to 93 near the foothills.
Tuesday Night... Mostly clear. Lows 62 to 66.
POP = Probability of Precipitation
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