We had an extremely hot day the other day for the first time in a long time.
We had an unusually hot day yesterday for the first time in ages.
ーWe had an extremely hot day the other day for the first time in a long time.
「先日は久しぶりの猛暑日になった」
an extremely hot day で「猛暑日」
for the first time in a long time で「久しぶりに」
ーWe had an unusually hot day yesterday for the first time in ages.
「昨日は久しぶりに猛暑日になった」
an unusually hot day で「猛暑日」
for the first time in ages で「久しぶりに」
例：
We had an extremely hot day the other day for the first time in a long time. It was almost 42 degrees Celsius.
「先日、久しぶりに猛暑日になった。ほぼ42度だった」
42 degrees Celsius で「42℃」
ご参考まで！
We had a scorching hot day for the first time in a while.
「久しぶりの猛暑日になりました」は英語で「We had a scorching hot day for the first time in a while.」と表現します。「scorching hot」は「猛暑」や「焼けつくような暑さ」を意味します。
Today it reached 35 degrees Celsius, making it the hottest day we've had in weeks.
『今日は気温が35度まで上がり、ここ数週間で最も暑い日になりました』
カナダ 
アメリカ合衆国 
