I do not know if the router is 2.4G or higher.
Your WiFi router will be the place to start then. Connect to your router, as per the user manual. In a nutshell, open a browser window and in the address bar type 192.168.1.254, press enter. Most routers use this address, but yours might be different.
Now use your router guide to see what is enabled. You can also have a look at DHCP and see if you can locate your weather station. Some router list the device name, others just show the mac address of the connected device.
Good luck and let us know how it goes.