Baytown's climate is classified as humid subtropical (Cfa in Köppen climate classification system). Prevailing winds from the south and southeast bring heat from the deserts of Mexico and moisture from the Gulf of Mexico.
Summer temperatures typically have highs near 90 °F (32 °C) though higher temperatures are not uncommon. The city's proximity to the bay and the winds that it generates moderate the area's temperatures and ease the effects of the humidity, creating a more pleasant climate than inland communities like Houston.
Winters in the area are temperate with typical January high of 61 °F (16 °C) and lows are near 42 °F (6 °C). Snowfall is rare. Annual rainfall averages exceed 49 inches (124 cm), with an annual average of 82 precipitation days.
The average elevation of Baytown is approximately 34 ft. above sea level.