应该翻译成:it didn't get cool after the rain.天气在句中通常用it来代替,而不是weather。rain 本身有名词词性,而且raining 本身是形容词词性,所以通常不会用raining这个动名词
The weather didn't get cooler after raining.The weather didn't get cooler after the rain.如果是动名词不必有the