San Marcos, CA Weather Forecast
Local 7-day forecast
Patchy Fog then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for San Marcos, CA in one place.
Patchy fog before 11am. Mostly sunny, with a high near 82. Southeast wind 0 to 10 mph.
Local Weather Overview
This forecast page for San Marcos, CA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 22, 2026 2:51 AM PDT.
The active forecast window currently covers Sep 23 to Sep 28, 2026 for San Marcos, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 23 to Sep 28, 2026
- Latest sync
- Sep 22, 2026 2:51 AM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in San Marcos
Saturday looks like the warmest upcoming period in San Marcos at 87 degrees F.
Sunday Night is the coolest period ahead with temperatures near 65 degrees F.
The strongest winds are forecast for Wednesday at about 0 to 10 mph SE.
The forecast from Sep 23 through Sep 28 stays mostly dry.
Forecast Details
- Last updated
- Sep 22, 2026 2:51 AM PDT
- Coverage
- 6 days
- Time zone
- America/Los_Angeles
- Forecast office
- SGX
- Radar station
- KNKX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Patchy fog after 5am. Partly cloudy, with a low around 66. North wind 0 to 5 mph.
Patchy fog before 11am. Sunny, with a high near 84.
Mostly clear, with a low around 67.
Sunny, with a high near 86.
Partly cloudy, with a low around 68.
Mostly sunny, with a high near 87.
Partly cloudy, with a low around 67.
Mostly sunny, with a high near 83.
Mostly clear, with a low around 65.
Sunny, with a high near 82.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 23
|
Patchy Fog then Mostly Sunny
|
82°F |
0 to 10 mph
SE
|
|
Wednesday Night
Sep 23
|
Partly Cloudy then Patchy Fog
|
66°F |
0 to 5 mph
N
|
|
Thursday
Sep 24
|
Patchy Fog then Sunny
|
84°F |
0 to 10 mph
NE
|
|
Thursday Night
Sep 24
|
Mostly Clear
|
67°F |
0 to 5 mph
NW
|
|
Friday
Sep 25
|
Sunny
|
86°F |
0 to 10 mph
NW
|
|
Friday Night
Sep 25
|
Partly Cloudy
|
68°F |
0 to 5 mph
N
|
|
Saturday
Sep 26
|
Mostly Sunny
|
87°F |
0 to 10 mph
NW
|
|
Saturday Night
Sep 26
|
Partly Cloudy
|
67°F |
0 to 5 mph
NW
|
|
Sunday
Sep 27
|
Mostly Sunny
|
83°F |
0 to 10 mph
NW
|
|
Sunday Night
Sep 27
|
Mostly Clear
|
65°F |
0 to 5 mph
NW
|
|
Monday
Sep 28
|
Sunny
|
82°F |
0 to 5 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around San Marcos.
