What Is Summer Solstice 2024 Significance. Is under a national heat advisory. Solstice—the longest day of the year in the northern hemisphere and the shortest in the southern hemisphere—will occur on thursday, june 20, at 20:50.

The summer solstice, which is also referred to. Summer solstice, the two moments during the year when the path of the sun in the sky is farthest north in the northern hemisphere (june 20 or 21) or farthest south.