San Marcos, CA Weather Forecast
Local 7-day forecast
Patchy Fog
Track current conditions, temperature changes, wind, and the full daily outlook for San Marcos, CA in one place.
Patchy fog. Mostly cloudy, with a low around 55. Southeast wind around 5 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: Apr 9, 2026 12:29 AM PDT.
The active forecast window currently covers Apr 9 to Apr 15, 2026 for San Marcos, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 9 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 12:29 AM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in San Marcos
Thursday looks like the warmest upcoming period in San Marcos at 77 degrees F.
Monday Night is the coolest period ahead with temperatures near 49 degrees F.
The strongest winds are forecast for Saturday at about 5 to 15 mph W.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 12:29 AM 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
Patchy fog before 11am. Partly sunny, with a high near 77. South wind 5 to 10 mph, with gusts as high as 25 mph.
Patchy fog after 11pm. Mostly cloudy, with a low around 56. West wind 0 to 10 mph.
Patchy fog before 11am. Mostly sunny, with a high near 74. Southeast wind 0 to 10 mph, with gusts as high as 20 mph.
A chance of rain showers after 11pm. Mostly cloudy, with a low around 56. West wind 0 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
A slight chance of rain showers before 11am. Mostly sunny, with a high near 69. Chance of precipitation is 20%.
Rain showers after 11pm. Mostly cloudy, with a low around 56.
Rain showers. Mostly cloudy, with a high near 65.
A chance of rain showers. Mostly cloudy, with a low around 50.
A slight chance of rain showers before 11am. Mostly sunny, with a high near 65.
Partly cloudy, with a low around 49.
Sunny, with a high near 71.
Mostly clear, with a low around 49.
Mostly sunny, with a high near 74.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Apr 9
|
Patchy Fog
|
55°F |
5 mph
SE
|
|
Thursday
Apr 9
|
Patchy Fog then Partly Sunny
|
77°F |
5 to 10 mph
S
|
|
Thursday Night
Apr 9
|
Patchy Fog
|
56°F |
0 to 10 mph
W
|
|
Friday
Apr 10
|
Patchy Fog then Mostly Sunny
|
74°F |
0 to 10 mph
SE
|
|
Friday Night
Apr 10
|
Chance Rain Showers
|
56°F |
0 to 10 mph
W
|
|
Saturday
Apr 11
|
Slight Chance Rain Showers then Mostly Sunny
|
69°F |
5 to 15 mph
W
|
|
Saturday Night
Apr 11
|
Rain Showers
|
56°F |
5 to 10 mph
SW
|
|
Sunday
Apr 12
|
Rain Showers
|
65°F |
5 to 15 mph
SW
|
|
Sunday Night
Apr 12
|
Chance Rain Showers
|
50°F |
5 to 10 mph
W
|
|
Monday
Apr 13
|
Slight Chance Rain Showers then Mostly Sunny
|
65°F |
5 to 10 mph
W
|
|
Monday Night
Apr 13
|
Partly Cloudy
|
49°F |
0 to 10 mph
W
|
|
Tuesday
Apr 14
|
Sunny
|
71°F |
0 to 10 mph
SW
|
|
Tuesday Night
Apr 14
|
Mostly Clear
|
49°F |
0 to 10 mph
NW
|
|
Wednesday
Apr 15
|
Mostly Sunny
|
74°F |
0 to 10 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around San Marcos.
