A wether is a billy goat or ram that was castrated at a young age. Whether is a word which expresses doubt or a choice between alternatives. To further complicate the matter, weather is what the conditions are like outdoors.
“The farmer harnessed his wether to pull a cart of vegetables to market.”
“’I don’t know whether you want me to stay or to go,’ she implored him, her brown eyes pooling with tears.”
“The weather is lovely today.”