Meaning Differences of "Whether" vs "Weather"

Hello, and thank you for the great question!
People often get confused between these two words. 

1. 'weather' is used to describe the climate.
2. 'whether' is used to indicate that there is an option or a choice that needs to be decided.

Let's look at an example that uses both words:

• "Please check the weather before you go to the shops to know whether you should take an umbrella or not."

Did you see that 'whether' was used to introduce a decision or choice that needed to be made? Whereas 'weather' was used to indicate the possibility of it being sunny or rainy. 

I hope that this helps you!