Spring comes with a gradual warm up from winter, lasting from March 20 through May. Temperatures are generally not hot yet, averaging from 75 -- 82 ° F (23.9 -- 27.8 ° C) in the day and 56 -- 64 ° F (13.3 -- 17.8 ° C) at night. Spring thunderstorms are common, often with spectacular lightning shows. This rainfall prompts Houston 's 10 - month - long "growing season '' to begin. April sees the return of many types of insects, including butterflies and mosquitoes, to Houston 's warm climate.
when does it start warming up in houston
March 20