not as ... as yesterday
今日は昨日ほど暑くない。
Today isn't as hot as yesterday.
今日は昨日ほど湿気がない。
Today isn’t as humid as yesterday.
今日は昨日ほど寒くない。
Today isn't as cold as yesterday.
今日は昨日ほど暑くはない。
Today isn’t as hot as yesterday.