| National Weather Service Forecast for:
San Marcos CA Issued by: National Weather Service San Diego, CA |
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| Updated: 12:34 am PDT Aug 20, 2026 | ||||||||||||||||||
|
| Overnight |
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 67. Calm wind. |
| Thursday |
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87. Light and variable wind becoming south 5 to 10 mph in the afternoon. |
| Thursday Night |
Patchy fog after 5am. Otherwise, mostly clear, with a low around 68. West wind around 5 mph becoming calm in the evening. |
| Friday |
Patchy fog before 8am. Otherwise, sunny, with a high near 87. Light west wind increasing to 5 to 10 mph in the morning. |
| Friday Night |
Mostly clear, with a low around 68. Northwest wind around 5 mph becoming calm. |
| Saturday |
Patchy fog before 11am. Otherwise, sunny, with a high near 87. |
| Saturday Night |
Mostly clear, with a low around 68. |
| Sunday |
Patchy fog before 11am. Otherwise, sunny, with a high near 88. |
| Sunday Night |
Mostly clear, with a low around 68. |
| Monday |
Sunny, with a high near 88. |
| Monday Night |
Mostly clear, with a low around 68. |
| Tuesday |
Sunny, with a high near 89. |
| Tuesday Night |
Mostly clear, with a low around 69. |
| Wednesday |
Mostly sunny, with a high near 89. |
Forecast from NOAA-NWS for San Marcos CA.
