Synonyms for Sultry (same or very similar meaning)
WordNet sense 1 (sexually exciting or gratifying):
sensualWordNet sense 2 (extended meanings; especially of psychological heat; marked by intensity or vehemence especially of passion or enthusiasm):
hotWordNet sense 3 (characterized by oppressive heat and humidity):
stifling, sulfurous, sulphurousFrom the ODE community, based on WordNetadd/edit