San Marcos, CA Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for San Marcos, CA in one place.
Mostly cloudy, with a high near 71. West wind 0 to 10 mph, with gusts as high as 20 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: May 23, 2026 10:55 PM PDT.
The active forecast window currently covers May 24 to May 30, 2026 for San Marcos, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 24 to May 30, 2026
- Latest sync
- May 23, 2026 10:55 PM 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 73 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 54 degrees F.
The strongest winds are forecast for Sunday at about 0 to 10 mph W.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- May 23, 2026 10:55 PM PDT
- Coverage
- 7 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
Mostly cloudy, with a low around 55. West wind 5 to 10 mph.
Mostly cloudy, with a high near 70. West wind 0 to 10 mph, with gusts as high as 20 mph.
Mostly cloudy, with a low around 55. West wind 0 to 10 mph.
Partly sunny, with a high near 68.
A slight chance of rain showers between 11pm and 5am. Mostly cloudy, with a low around 55.
Partly sunny, with a high near 65.
Mostly cloudy, with a low around 54.
Mostly sunny, with a high near 67.
Partly cloudy, with a low around 54.
Sunny, with a high near 70.
Mostly clear, with a low around 54.
Sunny, with a high near 73.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
May 24
|
Mostly Cloudy
|
71°F |
0 to 10 mph
W
|
|
Sunday Night
May 24
|
Mostly Cloudy
|
55°F |
5 to 10 mph
W
|
|
Memorial Day
May 25
|
Mostly Cloudy
|
70°F |
0 to 10 mph
W
|
|
Monday Night
May 25
|
Mostly Cloudy
|
55°F |
0 to 10 mph
W
|
|
Tuesday
May 26
|
Partly Sunny
|
68°F |
0 to 10 mph
W
|
|
Tuesday Night
May 26
|
Slight Chance Rain Showers
|
55°F |
5 to 10 mph
SW
|
|
Wednesday
May 27
|
Partly Sunny
|
65°F |
5 to 10 mph
SW
|
|
Wednesday Night
May 27
|
Mostly Cloudy
|
54°F |
5 to 10 mph
SW
|
|
Thursday
May 28
|
Mostly Sunny
|
67°F |
5 to 10 mph
SW
|
|
Thursday Night
May 28
|
Partly Cloudy
|
54°F |
0 to 10 mph
W
|
|
Friday
May 29
|
Sunny
|
70°F |
0 to 10 mph
W
|
|
Friday Night
May 29
|
Mostly Clear
|
54°F |
0 to 10 mph
N
|
|
Saturday
May 30
|
Sunny
|
73°F |
0 to 10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around San Marcos.
