天気予報によると、明日は快晴になるということだ。

tbd

According to the weather forecast, it will clear up tomorrow.

今日は快晴だ。これで一日中仕事が出来る。

tbd

It's fair today, so we can work all day.

今日の天気予報によると明日は快晴らしい。

tbd

Today's weather forecast says that it is likely to be fine tomorrow.

さっきまでの快晴がうそのようだ。

tbd

It's hard to believe it was so clear and sunny up to just now.

１０月には快晴の日が多い。

tbd

We have a lot of very fine days in October.