It's a heatwave.

Meaning

A period of unusually hot weather.

Examples

• John: It's so hot today!
• Alice: Yes, <b>it's a heatwave</b>. I've never felt this hot before.
• John: I know, I'm completely drained. This <b>it's a heatwave</b> is intense.
• Alice: Let's find some shade and stay hydrated.