晴れです。
Hare desu
It is sunny.
Simple noun + desu
今日はいい天気ですね。
Kyō wa ii tenki desu ne
Today is good weather, isn't it.
The most universal Japanese weather phrase
今日は晴れ渡って気持ちいいですね!
Kyō wa hare-watatte kimochi ii desu ne!
Today is completely clear and feels so good!
晴れ渡る = to clear up completely; 気持ちいい = feels great
More Japanese Weather Phrases