Atenolol and chlorthalidone combination is used to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. If it continues for a long time, the heart and arteries may not function properly.
San Marcos Average Weather. 1  The highest monthly average temperature in San Marcos for August is 70 degrees. 2  The lowest monthly average temperature in San Marcos for January is 55 degrees. 3  The most monthly precipitation in San Marcos occurs in January with 2.3 inches.  The air quality index in San Marcos is 22% worse than the national average.
Things to do in San Marcos CA. See All San Marcos Events. San Marcos, CA is located in San Diego County in Southern California. We have 892 businesses listed for San Marcos and below you'll find links to restaurants, hotels, shopping, and attractions in the San Marcos area. As you can see by the map of San Marcos some of the nearby cities include Lake San Marcos, Escondido, Vista, Hidden Meadows and Rancho Santa Fe. For you map buffs, the San Marcos latitude is 33.1434, the longitude is -117.166, and the elevation of San Marcos is 177 feet. An interesting fact is that the San Marcos city population is 69,697 which equates to approximately 2.3 percent of the 3,053,793 residents in San Diego County.