The hottest temperature ever in Texas was 120°F, recorded in Seymour in August 12, 1936 and Monahans on June 28, 1994.
See extreme weather records for Texas below (courtesy of TexasAlmanac.com):
Visit National Centers for Environmental Information (NCEI)'s website (formerly National Climatic Data Center [NCDC]) to access an active archive of weather data.
NCEI is responsible for hosting and providing access to one of the most significant archives on Earth, with comprehensive oceanic, atmospheric, and geophysical data.
From the depths of the ocean to the surface of the sun and from million-year-old sediment records to near real-time satellite images, NCEI is the Nation’s leading authority for environmental information.