Current Conditions

San Marcos, California

67°F20°C
Clear

Wind

NW 3 mph5 km/h

Humidity

85%

Cloud Cover

8%

As of Tuesday, September 22, 2026 at 10:13 PM PDT

Today's Outlook

Night

Mostly clear, with a low around 64°F18°C. Light wind from the WNW around 2 mph4 km/h.

7-Day Forecast

DayConditionHigh (°F)Low (°F)Precip (mm)Cloud Cover (%)Wind (mph)
ClearHigh 82°F28°CLow 64°F18°CPrecip 0 in0 mmCloud 16%Wind W 4 mph6 km/hWednesday: Mostly clear and warm, with a high of 82°F28°C and morning low of 69°F20°C. Breezy from the WSW at 6 to 9 mph9 to 14 km/h. Wednesday Night: Mostly clear, with a low around 64°F18°C. Light wind from the WNW around 2 mph4 km/h.
ClearHigh 81°F27°CLow 66°F19°CPrecip 0 in0.1 mm2%Cloud 19%Wind W 4 mph6 km/hThursday: Mostly clear and warm, with a high of 81°F27°C and morning low of 69°F20°C. Breezy from the WSW at 6 to 8 mph9 to 13 km/h. Thursday Night: Mostly clear, with a low around 66°F19°C. Light wind from the WNW around 2 mph4 km/h.
ClearHigh 84°F29°CLow 67°F20°CPrecip 0 in0 mmCloud 28%Wind W 4 mph7 km/hFriday: Partly cloudy and warm, with a high of 84°F29°C and morning low of 70°F21°C. Breezy from the W at 6 to 9 mph9 to 14 km/h. Friday Night: Partly cloudy, with a low around 67°F20°C. Light wind from the WNW around 2 mph4 km/h.
Partly CloudyHigh 85°F30°CLow 68°F20°CPrecip 0 in0 mmCloud 67%Wind WSW 4 mph6 km/hSaturday: Mostly cloudy and warm, with a high of 85°F30°C and morning low of 71°F22°C. Breezy from the WSW at 5 to 8 mph8 to 13 km/h. Saturday Night: Mostly cloudy, with a low around 68°F20°C. Light wind from the W around 2 mph4 km/h.
Light RainHigh 77°F25°CLow 70°F21°CPrecip 0.1 in2.6 mm42%Cloud 77%Wind W 4 mph6 km/hSunday: Mostly cloudy and warm, with a high of 77°F25°C and morning low of 72°F22°C. Light wind from the WSW around 5 mph7 km/h. 42% chance of light rain throughout the day. Sunday Night: Mostly cloudy, with a low around 70°F21°C. Light wind from the WNW around 3 mph4 km/h. 20% chance of drizzle before dawn.
DrizzleHigh 79°F26°CLow 67°F20°CPrecip 0.07 in1.7 mm24%Cloud 39%Wind W 4 mph7 km/hMonday: Partly cloudy and warm, with a high of 79°F26°C and morning low of 69°F21°C. Breezy from the W at 5 to 8 mph9 to 12 km/h. 24% chance of drizzle throughout the day. Monday Night: Partly cloudy, with a low around 67°F20°C. Light wind from the NW around 3 mph5 km/h. 17% chance of drizzle overnight.
ClearHigh 85°F29°CLow 65°F18°CPrecip 0.04 in1 mm5%Cloud 15%Wind WNW 4 mph6 km/hTuesday: Mostly clear and warm, with a high of 85°F29°C and morning low of 69°F21°C. Breezy from the W at 5 to 7 mph9 to 12 km/h. Tuesday Night: Mostly clear, with a low around 65°F18°C. Light wind from the N around 3 mph4 km/h.

15-Day Forecast

Day High Low Precip Cloud Cover Condition Wind
WednesdaySep 2382°F28°C64°F18°C0 in0 mm· —16%ClearW 4 mph6 km/h
ThursdaySep 2481°F27°C66°F19°C0 in0.1 mm· 2%19%ClearW 4 mph6 km/h
FridaySep 2584°F29°C67°F20°C0 in0 mm· —28%ClearW 4 mph7 km/h
SaturdaySep 2685°F30°C68°F20°C0 in0 mm· —67%Partly CloudyWSW 4 mph6 km/h
SundaySep 2777°F25°C70°F21°C0.1 in2.6 mm· 42%77%Light RainW 4 mph6 km/h
MondaySep 2879°F26°C67°F20°C0.07 in1.7 mm· 24%39%DrizzleW 4 mph7 km/h
TuesdaySep 2985°F29°C65°F18°C0.04 in1 mm· 5%15%ClearWNW 4 mph6 km/h
WednesdaySep 3087°F31°C66°F19°C0.03 in0.8 mm· 7%22%ClearW 4 mph6 km/h
ThursdayOct 187°F30°C68°F20°C0.02 in0.5 mm· 5%36%ClearW 4 mph7 km/h
FridayOct 284°F29°C69°F20°C0.05 in1.3 mm· 9%36%ClearW 4 mph6 km/h
SaturdayOct 384°F29°C68°F20°C0.05 in1.2 mm· 10%29%DrizzleW 4 mph6 km/h
SundayOct 484°F29°C67°F20°C0.02 in0.6 mm· 7%24%ClearW 4 mph6 km/h
MondayOct 585°F29°C67°F20°C0.04 in0.9 mm· 7%21%ClearW 4 mph7 km/h
TuesdayOct 686°F30°C67°F19°C0.03 in0.8 mm· 5%19%ClearW 4 mph7 km/h
WednesdayOct 785°F29°C67°F20°C0.01 in0.3 mm· 4%24%ClearW 5 mph7 km/h

Nearby Cities

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

PatternExampleDescription
/weather/{country}/{city}//weather/united-states/san-francisco/City forecast (canonical URL)
/weather/{city}//weather/tokyo/Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}//weather/united-states/california/san-francisco/With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}/weather/nearby?lat=48.1&lon=11.5Find nearest city by coordinates
/weather/{country}//weather/germany/Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 33.1434°N, 117.1661°W·Elevation: 177m·Timezone: America/Los_Angeles·Population: 92,931