今天天气真好用英语怎么说?

"The weather is really nice today" 是表达今天天气很好的常用英文句式。

其中，"weather" 是天气的意思， "nice" 是好的意思， "today" 是今天的意思。

例句：

"I'm so glad the weather is nice today, it's the perfect day for a picnic." (我真高兴今天天气这么好，这是野餐的完美天气。)
"I can't believe how beautiful the weather is today, let's go for a walk." (我真不敢相信今天天气这么美，让我们去散步吧。)
"The sun is shining and the birds are singing, it's a great day for a run." (阳光明媚，鸟儿在唱歌，这是慢跑的好天气。)