-off topic- In Oklahoma, we know a thing or two about weird weather. 1) Widest tornado ever recorded (2.6 miles wide), 2) Highest wind speed ever recorded (318 miles per hour) among other weird things.
"Weather" is not countable; that is, we can't say one weather or two weathers. That means we wouldn't say "a weather," although we can talk about "the weather." So -- "We're having bad weather" or "The weather is strange."