真夏日には屋内にひっこんで太陽を避けるしか手がないよ。

tbd

All I want to do during the dog days is stay indoors and keep out of the sun.

屋内にいるのがもったいないぐらいよい天気だった。

tbd

It was too nice a day to stay inside.

雨がひどく降ってきた、それで私たちは屋内で遊んだ。

tbd

Because it started raining hard, we played indoors.

It was raining hard, so we played indoors.

It started raining hard. Because of that, we played inside.