Lake 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 Lake San Marcos, CA in one place.
Patchy fog before 11am. Mostly sunny, with a high near 74.
Local Weather Overview
This forecast page for Lake 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 16, 2026 3:36 AM PDT.
The active forecast window currently covers Apr 19 to Apr 22, 2026 for Lake San Marcos, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 19 to Apr 22, 2026
- Latest sync
- Apr 16, 2026 3:36 AM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in Lake San Marcos
Sunday looks like the warmest upcoming period in Lake San Marcos at 74 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Sunday at about 0 to 10 mph SW.
The forecast from Apr 19 through Apr 22 stays mostly dry.
Forecast Details
- Last updated
- Apr 16, 2026 3:36 AM PDT
- Coverage
- 4 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 clear, with a low around 53.
Sunny, with a high near 71.
Partly cloudy, with a low around 53.
Mostly sunny, with a high near 70.
Partly cloudy, with a low around 52.
Partly sunny, with a high near 69.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Apr 19
|
Patchy Fog then Mostly Sunny
|
74°F |
0 to 10 mph
SW
|
|
Sunday Night
Apr 19
|
Mostly Clear
|
53°F |
0 to 10 mph
NW
|
|
Monday
Apr 20
|
Sunny
|
71°F |
0 to 10 mph
NW
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
53°F |
5 to 10 mph
W
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
70°F |
5 to 10 mph
W
|
|
Tuesday Night
Apr 21
|
Partly Cloudy
|
52°F |
5 to 10 mph
NW
|
|
Wednesday
Apr 22
|
Partly Sunny
|
69°F |
5 to 10 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Lake San Marcos.