Yes, the weather can affect the mobile connection, but it is usually not the main cause of a poor signal or low speed.
Heavy rain, snow, thunderstorms and other weather conditions can worsen the signal in some situations, especially if you are already far from a mobile mast or have weak coverage.
Problems are more often caused by the distance to the mast, terrain, buildings, trees, the load on the mobile network or the operator you are connected to.
If the connection gets worse, move the router to a better spot, restart it or test another operator via manual network selection.
What affects speed
Mobile speed does not only depend on whether the display says 4G or 5G. Distance to the mast, frequency band, obstacles, network load, placement and the operator used can make a big difference. So a stable 4G network can sometimes give a better result than a weak 5G network.
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