yes it is. the subject is the weather, and the verb is was.
How is the weather today? In a sentence: "The weather was terrible today."
We have good weather today.
It's the terrible weather
The weather is absolutely dismal today.
Today the weather Is humid.
1. The weather today was really cold.
The weather was at it's loveliest today
I didn't go to work today, as I was feeling under the weather.
the weather tomorrow is going to be cold. or the weather is forcasting 4 to 8 inches of snow or the weather is nice today
How stuffy is the weather today. Cloudness and hot temperature make the weather stuffy.
The weather is blazing hot outside today.
Our plans for today are in abeyance because of the poor weather