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 84.
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: Aug 21, 2026 5:12 AM PDT.
The active forecast window currently covers Aug 24 to Aug 27, 2026 for Lake San Marcos, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 24 to Aug 27, 2026
- Latest sync
- Aug 21, 2026 5:12 AM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in Lake San Marcos
Tuesday looks like the warmest upcoming period in Lake San Marcos at 86 degrees F.
Monday Night is the coolest period ahead with temperatures near 70 degrees F.
The strongest winds are forecast for Monday at about 0 to 10 mph NW.
The forecast from Aug 24 through Aug 27 stays mostly dry.
Forecast Details
- Last updated
- Aug 21, 2026 5:12 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 70.
Sunny, with a high near 86.
Mostly clear, with a low around 71.
Sunny, with a high near 86.
Partly cloudy, with a low around 70.
Mostly sunny, with a high near 86.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Aug 24
|
Patchy Fog then Mostly Sunny
|
84°F |
0 to 10 mph
NW
|
|
Monday Night
Aug 24
|
Mostly Clear
|
70°F |
0 to 5 mph
NW
|
|
Tuesday
Aug 25
|
Sunny
|
86°F |
0 to 10 mph
NW
|
|
Tuesday Night
Aug 25
|
Mostly Clear
|
71°F |
0 to 10 mph
W
|
|
Wednesday
Aug 26
|
Sunny
|
86°F |
0 to 10 mph
W
|
|
Wednesday Night
Aug 26
|
Partly Cloudy
|
70°F |
0 to 5 mph
W
|
|
Thursday
Aug 27
|
Mostly Sunny
|
86°F |
0 to 5 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Lake San Marcos.