英语高手请进.这句话有语病吗?It is said that today which the temperature h

英语高手请进.这句话有语病吗?It is said that today which the temperature has risen to 40 degrees is the hottest day of the year.
这是一道汉译英的题目,中文原句是：今天的气温已攀升到40度了,据说是今年以来最热的一天.参考答案的翻译为：The temperature today has climbed/risen/gone up to 40 degrees,and it is said to be the hottest day of the year.学生一定要问我,如果这样翻译可不可以----“It is said that today which the temperature has risen to 40 degrees is the hottest day of the year.
我总感觉读起来怪怪的,用which引导一个定语来从句修饰today,我还从没有听见过,但又说不上怎么不对了（学生都必须要听到你从语法角度解释清楚,他们才会相信）.
不好意思,打错了,应该是“用which引导一个定语从句来修饰today”