It's going to be the same temperature tomorrow as it was today.
The temperature is going to be around the same tomorrow as it was today.
ーIt's going to be the same temperature tomorrow as it was today.
「明日は今日と同じ気温になるだろう」
the same temperature で「同じ気温」
as it was today で「今日(の気温)と同じ」
ーThe temperature is going to be around the same tomorrow as it was today.
「明日気温は今日と同じくらいになるだろう」
to be around the same で「同じくらい」
ご参考まで!
Tomorrow will be about the same temperature as today.」
ご質問ありがとうございます。
「同じくらいの温度」はそのまま英語で「about the same temperature」と言えます。
また、「明日は今日と同じくらいの温度だよ」と言いたいなら、「Tomorrow will be about the same temperature as today.」になります。
ご参考になれば幸いです。