Teresina has a tropical wet and dry climate
(Köppen climate classification: Aw)
with two seasons with semi-humid characteristics: the rainy season (which
occurs in summer and autumn) and the dry season (which occurs in winter and
spring). From January to May, due to the rains, the weather is warm and wet
(likely to occur when there is fog in the morning), while from June to August
the climate gets dry with relatively cool nights; in September to December the
weather becomes more hot and stuffy, and may begin to occur a few rain showers
from November