We're having a heatwave.

Meaning

There's a period of unusually hot weather.

Examples

• John: It's incredibly hot today.
• Alice: Yes, <b>we're having a heatwave</b>. It's been going on for a week now.
• John: I can't wait for it to cool down.
• Alice: Me neither. Hopefully this <b>heatwave</b> breaks soon.