In Los Altos Hills, the summers are long, comfortable, arid, and mostly clear and the winters are short, cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 43°F to 75°F and is rarely below 36°F or above 85°F.
The warm season lasts for 4.4 months, from June 2 to October 16, with an average daily high temperature above 71°F. The hottest month of the year in Los Altos Hills is August, with an average high of 74°F and low of 59°F.

The cool season lasts for 2.3 months, from November 28 to February 9, with an average daily high temperature below 60°F. The coldest month of the year in Los Altos Hills is December, with an average low of 44°F and high of 57°F.