July in Los Alamos is the rainiest, the cloudiest, and the warmest month of the year. In July, the weather in Los Alamos is typically warm. Average daily high temperature in July is about 25 degrees above zero. On average, Los Alamos has 18 rainy, 9 sunny, and 4 partly cloudy days in July. The rains are usually heavy. July as well as January, February, March, and August is considered the most uncomfortable time to visit Los Alamos.