It's hot.

The phrase 'Es ist heiß' is used in German to express that the temperature is high. It's a direct translation of 'It's hot' in English. 'Es' is a placeholder subject in German, similar to 'it' in English. 'Ist' is the verb 'to be' in the third person singular, and 'heiß' is an adjective meaning 'hot'.

Example sentences using: Es ist heiß

Es ist heiß, also sollten wir Wasser trinken

It's hot, so we should drink water

This sentence is used to express the necessity of hydration in hot weather.

Es ist heiß, trotzdem geht er zum Laufen

It's hot, yet he goes for a run

This sentence is used to point out a contrasting behavior in hot weather.

Es ist heiß, deshalb habe ich mein Hemd ausgezogen

It's hot, that's why I took off my shirt

This sentence is used to justify an action based on the temperature.