GPS is going to be the most accurate at determining your location, since that’s the whole point of it. It’ll tell you exactly what spot your standing to within a couple meters.
But your phone in order to use the Internet either needs to connect to a cell tower, or to the internet over wifi. If it’s over a cellular network, your phone will be in communication with the nearest cell tower, which in turn knows where it is. Considering your looking for weather in your town and not the exact geographic location your standing at, that’s close enough for it to figure out where you are. Multiple cell towers could be used to triangulate your position, but for weather that’s far from needed.
Wifi works similarly. When you connect to a WiFi router, it has an address saying where it is, generally. This won’t be precise to your house, but it can be as precise as your general neighborhood. This would be good enough to tell you the weather.
I’m curious, why do have your GPS off on everything?
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