Today is a sunny day.
来源：sunny 是形容天气的常用词，表示晴朗，阳光明媚。
例句：
It's a beautiful sunny day, let's go for a picnic.
(今天是个漂亮的晴天，我们去野餐吧。)
It's not often we get such a sunny day in the middle of winter.
(冬天里有如此晴朗的天气并不常见。)
We're lucky to have a sunny day for the beach trip.
(我们很幸运今天有晴天去海滩旅行。)