The climate reflects Houston's location near the Gulf of Mexico: mild winters and hot, humid summers. In winter (December-early February), temperatures rarely dip below freezing and highs often reach the low to mid-60s F/15-18 C. Spring, which starts in late February or early March, is warm and slightly humid, but usually comfortable. Summer (late May-September) is hot and uncomfortably humid, with high temperatures above 90 F/32 C and 80%-90% humidity for extended periods.
Consider the weather when making sightseeing plans. During summer, opt for indoor attractions, such as museums, especially at midday. Take advantage of cooler spring and fall days for longer visits to outdoor parks, festivals and historical sights.
The heaviest rainfall occurs in late summer and in December. Heavy showers can move in rapidly from the Gulf of Mexico at any time of year, but they usually move out just as quickly.