what's the weather like in summer?中的like属什么词性?

介词,意思可以理解为“像”（你这一句里的like就不用翻译了）
like做介词（prep.）有如下几种意思：
1.像,如
They are like brothers and sisters.
他们就像兄弟姐妹一样.
2.(作法、程度等)和...一样
Dick acts like a gentleman.
迪克的举止如同绅士.
He was like a son to me.
他就像我的儿子一样.
3.与相称的
It's not like her to be so careless.
她通常是不会这么粗心的.
4.(与look,sound等连用)像要;好像是
It looks like rain.
好像要下雨了.
5.(与feel连用)想要
I don't feel like dancing now.
我现在不想跳舞.
6.诸如
He does well in subjects like history and philosophy.
他在历史和哲学这类课程上成绩不错.