Use 'sultriness' when describing weather that feels heavy and hot, often in summer.

Weather Related

Sultriness often implies discomfort due to high humidity and temperature.

Physical Discomfort

Sultriness can reflect the exotic or tropical atmosphere of a place.

'Sultriness' suggests a strong, often subtle, sexual appeal and confidence.

Use 'sultriness' to describe a mysterious, alluring quality in someone's appearance or behavior.

Sultriness implies a more understated sexuality, not explicit or in-your-face.