Siri stopped giving me the forecast

Hi people,

I used to be able to ask Siri “What’s the forecast for today?” And all of the sudden it stopped. Now it says I need to unlock my iPhone first, then it displays on the screen: I don’t see an app for that. You’ll need to download one. I have the default weather app on my iPhone.

Does anyone have any ideas how to fix this?

Thank you in advance for your replies.