Sultry means very hot and a little wet, like the weather in a rainforest.
Sultry can make people think of sweating, discomfort, and maybe a little bit of romance.
Examples:
The jungle was sultry and hard to walk in.
She felt sultry in the tropical heat.
The sultry weather made everyone tired.
The cat looked sultry in the hot sun.
The sultry room felt like a sauna.
The sultry evening made the air feel heavy and thick.