• 晴はれる — to clear up (sky)
• 晴天せいてん — fine weather
• 晴はれ着ぎ — formal dress
• 晴はれ間ま — break in the clouds
• 快晴かいせい — clear and sunny
• 晴朗せいろう — clear and bright

The kanji 晴 is made up of 日 (sun) and 青 (blue/clear). It expresses the idea of the sky becoming clear after rain — a common sight in Japan's changing seasons. It also implies a sense of relief or brightness, not just in weather, but sometimes even emotionally.

明日あしたは 晴はれるでしょう。
It will probably be sunny tomorrow.

晴はれた空そらがきれいです。
The clear sky is beautiful.