The weather forecast said that it will be clear tomorrow, a day after tomorrow, and two days from now.
The forecast says "clear weather, with clouds later on," so I don't think you need an umbrella.
It’s a good thing it’s clear out on your birthday, eh?
If you say something is going to clear up, you're usually talking about the weather. That makes it clear weather!
This has the same reading as the kanji you learned, meaning you know the reading!