
die Hitze
heat
A state of very high temperature, especially in relation to the weather or fire.
Bei dieser Hitze im Sommer gehe ich am liebsten ins Schwimmbad.
In this summer heat, I prefer going to the swimming pool.
heat
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heat
A state of very high temperature, especially in relation to the weather or fire.
Bei dieser Hitze im Sommer gehe ich am liebsten ins Schwimmbad.
In this summer heat, I prefer going to the swimming pool.

heat
A state of great haste, excitement, or a strong feeling such as anger or passion.
In der Hitze des Gefechts hat er Dinge gesagt, die er später bereute.
In the heat of the moment, he said things he later regretted.

heat
The phase in which female mammals are ready to mate.
Unsere Katze ist gerade in der Hitze und miaut die ganze Nacht.
Our cat is in heat right now and meows all night.
'Die Hitze' (the heat) is the noun related to the adjective 'heiß' (hot). When something is very hot, people speak of 'großer Hitze' (great heat).
Die Suppe ist noch zu heiß, lass sie abkühlen.
The soup is still too hot; let it cool down.
When 'Hitze' (heat) describes the weather, it is usually used as an uncountable noun. People speak of 'großer Hitze' (great heat) or 'der Hitze' (the heat), but normally not of 'einer Hitze' (a heat).
Die extreme Hitze macht allen zu schaffen.
The extreme heat is making life difficult for everyone.
Common adjectives used with 'Hitze' (heat) in connection with the weather are 'große' (great), 'extreme' (extreme), 'drückende' (oppressive), or 'unerträgliche' (unbearable) heat.
Morgen erwartet uns drückende Hitze mit hoher Luftfeuchtigkeit.
Tomorrow we can expect oppressive heat with high humidity.
The expression 'in der Hitze des Gefechts' (in the heat of the battle/moment) is very common. It describes a situation full of stress or excitement in which someone acts or speaks without thinking.
Er hat sich entschuldigt; das war nur in der Hitze des Gefechts gesagt.
He apologized; that was only said in the heat of the moment.
The meaning 'readiness to mate' is used exclusively in connection with animals. The context always makes clear what is meant here.
Der Tierarzt sagte, die Hündin sei in der Hitze.
The vet said the female dog was in heat.
temperature
Temperatur is the measurable value used to indicate how warm or cold an environment is. Hitze, by contrast, refers to a state of very high temperature, especially in connection with the weather or a fire. Name a Temperatur when an exact measurement is important, and use Hitze when the intense warmth is the focus.

Wegen der großen Hitze bleiben wir heute Nachmittag zu Hause.
Because of the intense heat, we are staying home this afternoon.
Die Temperatur im Büro beträgt heute thirty Grad Celsius.
The temperature in the office is thirty degrees Celsius today.