We're in for a scorcher.

Meaning

It's going to be extremely hot.

Examples

• John: I forgot my sunglasses.
• Alice: You'll need them! <b>We're in for a scorcher</b> today.
• John: Oh no, I hate extreme heat!
• Alice: Me too. Stay hydrated! I hope we can find some shade. It really seems like <b>we're in for a scorcher</b>.