I cannot open Apple weather app on my iPad.

If you have a recent iPad that is compatible with iPadOS , iPads have access to a Weather widget, instead of a weather app.

Tap on the link bekow.

Use widgets on your iPad - Apple Support

xtxavisworld Said:

"I cannot open Apple weather app on my iPad.: It’s telling me to ope the apple weather app and it doesn’t open. That ruins my day. Can you help me?"

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Incomparably is the Culprit:

Apparently, it is incompatible with your device, as the top line reads: "Not compatible with this device. See full list of compatible devices". So, you cannot use this with your device.

In the history of the iPad, there has never been a default iOS weather app included with any iPad. The Apple iOS weather app is only available for iPhones. You will need a third party weather app on an iPad.

There is also no default iOS calculator app included with iPads.