Summer Equinox 2024. In 2024, the last day of summer in the northern hemisphere is september 22! The summer solstice is the time when the sun reaches its highest and northernmost points in the sky, according to the farmer's almanac, marking the first day.

Summer solstice 2024 (beginning of astronomical summer) on the day of the summer (june) solstice, the solar disk, moving along the ecliptic, will fall into its northernmost. It signals the beginning of astronomical summer north of the equator and winter in the southern hemisphere.