
schwül
humid
Describes weather that feels unpleasant and oppressive because of a combination of high humidity and warmth.
Heute ist es so schwül, dass man kaum atmen kann.
It's so humid today that you can hardly breathe.
humid / sultry
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humid
Describes weather that feels unpleasant and oppressive because of a combination of high humidity and warmth.
Heute ist es so schwül, dass man kaum atmen kann.
It's so humid today that you can hardly breathe.

sultry
Describes an atmosphere or mood that is perceived as erotically charged, sensual, or provocative.
In der Bar herrschte eine schwüle Atmosphäre aus Parfum und leiser Jazzmusik.
There was a sultry atmosphere in the bar, filled with perfume and soft jazz music.
The adjective 'schwül' (humid/sultry) is closely related to the noun 'die Schwüle' (humidity, sultriness). 'Die Schwüle' describes the state of humid, oppressive weather itself.
Wegen der großen Schwüle konnte ich kaum schlafen.
Because of the intense humidity, I could hardly sleep.
You can recognize the meaning of 'schwül' (humid/sultry) from the context. If people are talking about 'Wetter' (weather), 'Luft' (air), 'Hitze' (heat), or 'Sommer' (summer), it means oppressive, humid warmth. In connection with 'Atmosphäre' (atmosphere), 'Stimmung' (mood), or 'Blick' (look/gaze), it has the erotic, sensual meaning.
An diesem schwülen Sommertag sind alle ins Freibad gegangen.
On this humid summer day, everyone went to the outdoor pool.
When talking about the weather, 'schwül' (humid) is very often used with 'es ist' (it is) to describe the current state of the atmosphere. Common combinations are also 'schwüle Hitze' (humid heat) or 'ein schwüler Tag' (a humid day).
Es ist heute sehr schwül und drückend.
It is very humid and oppressive today.
damp / humid
Feucht describes air containing a lot of water without specifying whether it is warm or unpleasant. Schwül, on the other hand, means that high humidity and warmth are experienced together as oppressive. Feucht is appropriate for the water content; schwül for oppressively humid heat.

Am warmen Nachmittag war die Luft draußen unangenehm schwül.
The air outside was unpleasantly muggy on the warm afternoon.
Am kühlen Morgen war die Luft draußen sehr feucht.
The air outside was very damp on the cool morning.