I wish I could use a different weather app on the watch as the default Apple weather is sometimes as much as 10 degrees or more different than all other weather data for my area.... Reported to Apple a few times with no fix. Not sure where they are pulling their weather data from but it is not accurate most of the time for me.
Apple please fix you data or at least let me choose a different source.
Apple Weather is brutally bad for areas with even remotely variable weather over the course of any given day, especially days with strong warm/cold fronts. I can only make an educated guess (as a degreed meteorologist), but it appears that Apple Weather relies solely on a blend of weather forecast models and does
not directly ingest surface observations to adjust when the models' initialization conditions are wrong.
Observations get ingested into weather models for initialization conditions and then that gets thrown into the blend as model runs complete, which can take several hours. Models often underestimate the speed and intensity of cold fronts, especially strong ones, so on days with a strong cold front that's ahead of schedule, you can see Apple Weather religiously sticking to its guns on its incorrect forecast and showing "current" temperatures 10°F or more above actual until the forecast catches up to reality, either by simple timing offset or reality getting ingested into the forecast.
Not ingesting surface observations at all (again, seemingly) is a…fascinating choice. But Apple doesn't have to deal with the consequences in sunny, steady-state Cupertino. They should take a Great Plains spring/fall for a spin.
ETA: They seem to do
better on "is it raining," but I can also tell you that the precipitation map displayed in the Weather app appears modeled. As of 11:40 PM CDT April 29, 2026, it shows a bullseye of moderate precipitation in east Texas about halfway between Houston and Tyler (see first screenshot). Compare that with the MRMS QCed reflectivity mosaic in the second screenshot and you can see it's more or less completely made up.

