Why is the iOS Weather App so inaccurate?

Over the last year, I have noticed that asking Siri to share the upcoming weather is incredibly inaccurate. Just yesterday, I asked Siri if it would be raining in New York City this week. Siri responded that there was no rain happening at all this week. The same was reflected in the Weather widget. Today, there are massive thunderstorms in the area for the majority of the day.

Can Apple provide some guidance on what is being done to address this? Is it a matter of using a different, more accurate weather service?