Weather data is not collected directly overhead from where you live. Apple is not a weather forecast originator and simply receives an amalgamation of weather data from different sources and forecasts which the application attempts to consolidate and display for you. As weather is a chaotic system that mankind does not control, those forecasts are best guesses based on data at some point in time at some location other than where you live.
I never use the Apple Weather application. I live five miles from the AirPort which is a National Weather Service (weather.gov) relay point for weather that originates at another NWS site 70 miles away. Usually, the weather information is reasonably accurate, though a small thunderstorm may be raging overhead and it will be sunny at the airport. Such as life.
I use an iOS version of the National Weather Service webpage on my iPhone 16 Pro Max. It still works but was decommissioned in June 2024. You can visit weather.gov, enter your zip code, and bookmark that site in your browser. That gives me what I need to know about local current weather without being filtered or munged by Apple.
For storm-specific monitoring (to keep my Saab safe from approaching hail storms), I use the paid RadarScope application on my Mac, iPhone, iPad, and Apple TV. That costs $9.99 a year, is available on all mentioned platforms at no extra cost, and is worth every cent.
