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That’s because, under the hood, almost all apps access a generic weather prediction model spit out by a supercomputer, and these models have “ruts” and gaps where their prediction is bad.
There are a few popular ones, like:
It gets complicated. But if you see two weather apps with identical predictions, this is why.
Hence, the ideal situation is picking access to multiple models, and seeing what they predict and how they agree for yourself. Maybe the ECWMF has a bad season, so you switch to GFS, or maybe the Canadian model is better in your area; whatever the case, it actually lets you see the underlying source of the predictions.
This is what the Windy app does. It has mobile apps, but it’s also a generic web app:
https://www.windy.com/
One caveat: if you’re just looking for “what’s it like right now, or in the next hour?” in a well populated area, sometimes Weather Underground or Weatherbug will outperform other apps because of the sheer locality of crowdsourced stations. Nothing beats two weather stations half a mile from you.
But this isn’t so great for looking hours or days ahead. You want wide access to a supercomputer model for that, ideally interpreted by a real meteorologist who specializes in your area and overlays their tuned predictions on top.
In fact, I tend to look at my local news apps when a prediction is really important, as they know what they are talking about.
Source: when I moved to Florida and experienced hurricanes up close, I got really into DIY weather.
Model picking + local meteorologists is the way. Use data sources professional meteorologists use.
There are also more “raw” sources of these models (like TropicalTidbits), but Windy is an excellent and accessible one.