Weather keeps changing. and taking niece shopping?

I am taking my 3 yr old niece shopping on Monday. I checked yesterday and it said raining. I checked a second ago and it said partly cloudy. I have no idea what to believe.
She isn't going with her buggy, she likes to walk. And explore, also is old enough to walk.
Why does the weather change?
Update: I don't have a car. She does have wellies. We're taking the bus up town
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