San Marcos, CA Weather Forecast
Local 7-day forecast
Patchy Fog then Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for San Marcos, CA in one place.
Patchy fog before 11am. Sunny, with a high near 90. Northwest 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: Aug 21, 2026 4:13 PM PDT.
The active forecast window currently covers Aug 23 to Aug 27, 2026 for San Marcos, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 23 to Aug 27, 2026
- Latest sync
- Aug 21, 2026 4:13 PM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in San Marcos
Tuesday looks like the warmest upcoming period in San Marcos at 91 degrees F.
Sunday Night is the coolest period ahead with temperatures near 69 degrees F.
The strongest winds are forecast for Sunday at about 0 to 10 mph NW.
The forecast from Aug 23 through Aug 27 stays mostly dry.
Forecast Details
- Last updated
- Aug 21, 2026 4:13 PM 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. Mostly clear, with a low around 69.
Patchy fog before 11am. Sunny, with a high near 90.
Mostly clear, with a low around 70.
Sunny, with a high near 91.
Mostly clear, with a low around 71.
Sunny, with a high near 91.
Partly cloudy, with a low around 70.
Mostly sunny, with a high near 91.
Partly cloudy, with a low around 70.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Aug 23
|
Patchy Fog then Sunny
|
90°F |
0 to 10 mph
NW
|
|
Sunday Night
Aug 23
|
Mostly Clear then Patchy Fog
|
69°F |
0 to 5 mph
N
|
|
Monday
Aug 24
|
Patchy Fog then Sunny
|
90°F |
0 to 10 mph
NW
|
|
Monday Night
Aug 24
|
Mostly Clear
|
70°F |
0 to 10 mph
NW
|
|
Tuesday
Aug 25
|
Sunny
|
91°F |
0 to 10 mph
NW
|
|
Tuesday Night
Aug 25
|
Mostly Clear
|
71°F |
0 to 10 mph
S
|
|
Wednesday
Aug 26
|
Sunny
|
91°F |
0 to 10 mph
SE
|
|
Wednesday Night
Aug 26
|
Partly Cloudy
|
70°F |
0 to 5 mph
S
|
|
Thursday
Aug 27
|
Mostly Sunny
|
91°F |
0 to 10 mph
SW
|
|
Thursday Night
Aug 27
|
Partly Cloudy
|
70°F |
0 to 5 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around San Marcos.
