San Marcos, California 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 81°F 27°C Heat Index: 85°F	Observed at: San Marcos, CA	Elevation: 462 ft | 141 m
	Last Updated: July 27, 5:30 PM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 81°F | 27°C
	Pressure: 29.26 in | 990.9 mb	Dewpoint: 71°F | 22°C
	Humidity: 71%	Wind: WSW 8 mph | WSW 13 kph
	Feels Like: 86°F | 30°C	Visibility: 54.8 mi | 88.3 km
	Lat/Long: 33.1434 | -117.1661	Sunrise: 5:58 AM   Sunset: 7:51 PM

7 Day Graphical Forecast

Valid: 4:03 PM 7/29/2026

Today Foggy 87 |69 °F 31 |21 °C 0% Chance Precipitation Tuesday Foggy 84 |66 °F 29 |19 °C 0% Chance Precipitation Wednesday Clear 84 |60 °F 29 |16 °C 0% Chance Precipitation Thursday Overcast 86 |59 °F 30 |15 °C 0% Chance Precipitation Friday Clear 87 |61 °F 31 |16 °C 0% Chance Precipitation Saturday Overcast 90 |65 °F 32 |18 °C 0% Chance Precipitation Sunday Overcast 86 |64 °F 30 |18 °C 1% Chance Precipitation

7 Hour Graphical Forecast

Valid: 4:03 PM 7/29/2026

4 PM Clear 80 °F 0% Chance Precipitation

5 PM Clear 78 °F 0% Chance Precipitation

6 PM Clear 77 °F 0% Chance Precipitation

7 PM Clear 75 °F 0% Chance Precipitation

8 PM Clear 67 °F 0% Chance Precipitation

9 PM Clear 62 °F 0% Chance Precipitation

10 PM Clear 61 °F 0% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for San Marcos, CA - (Fahrenheit & Celsius) Valid: 4:03 PM 7/29/2026 Today Foggy with a high near 87°F [31°C]. W wind to around 10 mph [15 kph], with gusts to near 11 mph [17 kph]. Dewpoint near 71°F [22°C] with humidity of 95%. Pressure around 29.26 in [990.9 mb]. UV Index: 8.45. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Tonight Foggy with a low around 69°F [21°C]. W wind to around 10 mph [15 kph], with gusts to near 11 mph [17 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Tuesday Foggy with a high near 84°F [29°C]. WSW wind to around 9 mph [15 kph], with gusts to near 10 mph [17 kph]. Dewpoint near 71°F [22°C] with humidity of 99%. Pressure around 29.26 in [990.9 mb]. UV Index: 8.45. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Tuesday Night Foggy with a low around 66°F [19°C]. WSW wind to around 9 mph [15 kph], with gusts to near 10 mph [17 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Wednesday Clear with a high near 84°F [29°C]. WSW wind to around 11 mph [18 kph], with gusts to near 10 mph [17 kph]. Dewpoint near 71°F [22°C] with humidity of 97%. Pressure around 29.26 in [990.9 mb]. UV Index: 8.4. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Wednesday Night Clear with a low around 60°F [16°C]. WSW wind to around 11 mph [18 kph], with gusts to near 10 mph [17 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 86°F [30°C]. WSW wind to around 10 mph [16 kph], with gusts to near 9 mph [14 kph]. Dewpoint near 71°F [22°C] with humidity of 92%. Pressure around 29.26 in [990.9 mb]. UV Index: 8.1. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 59°F [15°C]. WSW wind to around 10 mph [16 kph], with gusts to near 9 mph [14 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Friday Clear with a high near 87°F [31°C]. W wind to around 10 mph [16 kph], with gusts to near 10 mph [15 kph]. Dewpoint near 71°F [22°C] with humidity of 88%. Pressure around 29.26 in [990.9 mb]. UV Index: 8.4. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Friday Night Clear with a low around 61°F [16°C]. W wind to around 10 mph [16 kph], with gusts to near 10 mph [15 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Saturday Overcast with a high near 90°F [32°C]. WSW wind to around 10 mph [16 kph], with gusts to near 8 mph [12 kph]. Dewpoint near 71°F [22°C] with humidity of 86%. Pressure around 29.26 in [990.9 mb]. UV Index: 8.35. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Saturday Night Overcast with a low around 65°F [18°C]. WSW wind to around 10 mph [16 kph], with gusts to near 8 mph [12 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Sunday Overcast with a high near 86°F [30°C]. SW wind to around 12 mph [20 kph], with gusts to near 9 mph [15 kph]. Dewpoint near 71°F [22°C] with humidity of 91%. Pressure around 29.26 in [990.9 mb]. UV Index: 8.3. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Sunday Night Overcast with a low around 64°F [18°C]. SW wind to around 12 mph [20 kph], with gusts to near 9 mph [15 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for San Marcos, CA

Today: 0.0 mm | 0.00 in

Tonight: 0.0 mm | 0.00 in

Tuesday: 0.0 mm | 0.00 in

Tuesday Night: 0.0 mm | 0.00 in

Wednesday: 0.0 mm | 0.00 in

Wednesday Night: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 0.0 mm | 0.00 in

Saturday Night: 0.0 mm | 0.00 in

Sunday: 0.0 mm | 0.00 in

Sunday Night: 0.0 mm | 0.00 in

7 Day and Night - Maximum Wind Speed Forecast for San Marcos, CA

Today: W @ 15 kph | 10 mph

Tonight: W @ 15 kph | 10 mph

Tuesday: WSW @ 15 kph | 9 mph

Tuesday Night: WSW @ 15 kph | 9 mph

Wednesday: WSW @ 18 kph | 11 mph

Wednesday Night: WSW @ 18 kph | 11 mph

Thursday: WSW @ 16 kph | 10 mph

Thursday Night: WSW @ 16 kph | 10 mph

Friday: W @ 16 kph | 10 mph

Friday Night: W @ 16 kph | 10 mph

Saturday: WSW @ 16 kph | 10 mph

Saturday Night: WSW @ 16 kph | 10 mph

Sunday: SW @ 20 kph | 12 mph

Sunday Night: SW @ 20 kph | 12 mph

7 Day and Night - Maximum Humidity Forecast for San Marcos, CA

Today: 95 %

Tonight: 95 %

Tuesday: 99 %

Tuesday Night: 99 %

Wednesday: 97 %

Wednesday Night: 97 %

Thursday: 92 %

Thursday Night: 92 %

Friday: 88 %

Friday Night: 88 %

Saturday: 86 %

Saturday Night: 86 %

Sunday: 91 %

Sunday Night: 91 %

7 Day and Night - Snowfall Totals Forecast for San Marcos, CA

Today: 0.0 cm | 0.00 in

Tonight: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

Wednesday: 0.0 cm | 0.00 in

Wednesday Night: 0.0 cm | 0.00 in

Thursday: 0.0 cm | 0.00 in

Thursday Night: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

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