Use 'sultry' to describe weather that feels oppressively warm, often before a thunderstorm. The forecast predicts a sultry day with possible thunderstorms in the evening.
Pro Tip 2/3
Feels Uncomfortable
'Sultry' often implies discomfort due to excessive heat and moisture. The air was so sultry that it was hard to breathe.
Pro Tip 3/3
Not Just Hot
'Sultry' is more than hot; it's hot and humid together, making it feel steamy. After the rain, the city was enveloped in sultry heat.