Over the course of the year, the temperature in Tucumcari typically varies from 26°F to 94°F and is rarely below 14°F or above 102°F. The hot season lasts for 111 days, from May 25 to September 13, with an average daily high temperature above 86°F. The hottest day of the year is July 5, with an average high of 94°F and low of 67°F.