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Current Weather in San Marcos, CA

Updated: Thu Sep 17th 2026 8:45 PM PDT

Clear

66^°F 19^°C

Feels Like 66^°F / 19^°C

San Marcos, CA weather condition is Clear and 66°F.

Today's Weather in San Marcos,CA

The current weather in San Marcos CA as of 8:45 PM PDT on Thu Sep 17th 2026, has a sky condition of Clear with the visibility of 6 mile(s). It is 66 degrees fahrenheit with a forecasted high of 76 and low of 63. The barometric pressure is 30.05 - measured by inches of mercury - and is rising since its last observation. The humidity is 77 percent that's rising since the last report, with a dew point of 58 degrees fahrenheit which is rising. Wind direction is from the West at 4.9 miles per hour, gusting at 5.2 miles per hour. Sunrise was at 6:33 AM and Sunset was at 6:52 PM. The moon phase is a First Quarter moon rising at 1:29 PM with 42% illumination. Thank you for listening to the weather report from LocalConditions.com!

Listen to this weather report - press Read

Barometer 30.05 inHg. rising
Humidity 77% rising
Heat Index 66°F
Wind from W. 4.9 mph
Wind Gust 5.2 miles per hour
Wind Chill 66°F
UV Index 0

Dew Point 58°F rising
Visibility 6 mi.
Sunrise 6:33 AM
Sunset 6:52 PM
Moonrise 1:29 PM
Moonset 11:06 PM
Moon Phase First Quarter Moon 42%

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Radar Alerts Next 48 Hours Traffic

Hourly Forecast - Next 8 hours

5 Day Forecast

Sunny

Sunny with a high of 76°F and a low of 63°F. 36% possible chance of rain predicted with an estimated 0.02in. Winds will be moderate, blowing around 15mph. The humidity will be on the higher side, reaching around 72%.

Temperature	Humidity	Rainfall	Snow	Wind
Hi 76° \| Lo 63°	72%	36% \| est. 0.02in	0%	14.1 mph

Sunny

Sunny with a high of 76°F and a low of 62°F. 5% possible chance of rain predicted. Winds will be moderate, blowing around 12mph. The humidity will be on the higher side, reaching around 70%.

Temperature	Humidity	Rainfall	Snow	Wind
Hi 76° \| Lo 62°	70%	5%	0%	11.6 mph

Sunny

Sunny with a high of 79°F and a low of 62°F. 5% possible chance of rain predicted. Winds will be moderate, blowing around 13mph. The humidity will be on the higher side, reaching around 67%.

Temperature	Humidity	Rainfall	Snow	Wind
Hi 79° \| Lo 62°	67%	5%	0%	12.1 mph

Sunny

Sunny with a high of 78°F and a low of 62°F. 9% possible chance of rain predicted. Winds will be moderate, blowing around 13mph. The humidity will be on the higher side, reaching around 70%.

Temperature	Humidity	Rainfall	Snow	Wind
Hi 78° \| Lo 62°	70%	9%	0%	12.3 mph

Sunny

Sunny with a high of 75°F and a low of 63°F. 11% possible chance of rain predicted with an estimated 0in. Winds will be moderate, blowing around 14mph. The humidity will be on the higher side, reaching around 73%.

Temperature	Humidity	Rainfall	Snow	Wind
Hi 75° \| Lo 63°	73%	11% \| est. 0in	0%	13.2 mph

Yesterday 5-Day 10-Day

Weather Radar Map

Live San Marcos, CA weather with granular precipitation, radar, barometric pressure, temperatures and wind speeds for today thru Monday, as you toggle through each map layer. Use the slider to move forward and back in time to view how current data and forecasts will affect the region; you can press or click on the map to show metrics available for each tab. The related timestamp is located above the Play button which will animate the weather forecast.

Hourly Temperature

The current temperature today is 66^°F. The morning temperature of 63°^F is lowest at 1am with the daytime high of 76°^F at 12pm and a low around 65°^F at 9pm is expected.

Hourly Barometric Pressure

The highest pressure today is 30.07^inHg at 10am and lowest being 30.01^inHg at 12am.

Hourly Wind Speeds

The fastest wind is reported to be 14.1^mph at 2pm, while the slowest is 0.2^mph around 1am; expect wind gusts peaking 23^mph at 2pm.

More Weather Charts

Current National Weather

More Flash Flooding Expected in the Southwest and Plains: 09-17 to 09-19

Updated Thu Sep 17th 2026, 5:06am PDT

This week, we're looking at more flash flooding risks in parts of the Southwest, Northern Plains, and Upper Midwest. High temperatures will persist across the South-Central U.S. with possible record highs. Watch out for scattered thunderstorms in Florida, though they won't bring excessive rain. Stay safe and keep updated!

Southwest and Rockies

On Thursday, the focus for heavy rain shifts from the Great Basin to the Southern Rockies. A moisture-rich system will enhance showers and isolated thunderstorms, leading to potential flash flooding. Although fewer storms than yesterday, high rainfall rates make flash floods still a concern.

Northern Plains to Upper Midwest

Expect heavy rain from Friday into Saturday as a new low-pressure system forms over the Central High Plains. This system will bring more flash flooding risks from the Northern Plains to the Upper Midwest. The cold air from Canada will bring cooler temperatures, leading to highs in the 60s and 70s north of the front.

South-Central U.S.

The South-Central U.S. will continue to experience hot temperatures due to a strong upper-level high pressure—a heat dome—causing highs in the 90s and 100s. Heat advisories are in place, and daily record highs might be challenged.

Florida

Expect scattered thunderstorms in Florida due to a stationary front near the heat dome. Heavy downpours are possible, but they won't likely lead to excessive rainfall.

This weather report is relevant for ZIP codes 92069, 92078, 92079, and 92096, accurately covering areas of San Marcos, CA.