①It's getting warmer these past few days, but it'll be cold again tomorrow.
②It's gotten warmer all of a sudden, but it'll be cold again tomorrow.
「ここ数日で急に暖かくなったけど明日からまた寒いみたい」
①It's getting warmer these past few days, but it'll be cold again tomorrow.
②It's gotten warmer all of a sudden, but it'll be cold again tomorrow.
①※(be) getting warmer 暖かくなってきている
※past few days ここ数日
②※has gotten warmer 暖かくなってきた
※all the sudden 急に
「ニュースで聞いた」(天気予報で言っていた)は、
The weather report said... で、
「It's getting warmer these past few days, but the weather report said it'd be cold again tomorrow.」
ですね。
It got warmer suddenly over the last few days, but it looks like it will be cold again from tomorrow.
数日で over the last few days
急に suddenly
みたい it looks like
「みたい」は it looks like で言えます。天気予報によく使われている表現になります。
例文 It looks like it will be clear tomorrow.
「明日は晴れみたいです。」
例文 It looks like a storm is coming.
「嵐が来るみたいです。」
ご参考になれば幸いです。