Make sure you wear something warm tomorrow because it's going to be cold.
Be sure to dress warm tomorrow because the temperature is going down.
ーMake sure you wear something warm tomorrow because it's going to be cold.
「寒くなるから明日は暖かい格好をしてきてね」
to make sure で「必ずする」
to wear something warm で「何か暖かいものを着る」
it's going to be cold で「寒くなる」
ーBe sure to dress warm tomorrow because the temperature is going down.
「気温が下がるから明日は暖かい格好をしてきてね」
to dress warm で「着込む・暖かい格好をする」
the temperature is going down で「気温が下がる」
ご参考まで!