Contrary to what your local meteorologist is or has told you on the news, today is midsummer, not the first day of summer.
Astronomically, the sun reached reached perihelion with the North Pole today causing it to appear very high in the sky for those of us in the northern hemisphere. Where I live we got, officially, 14 hours and 59 minutes of daylight. In Barrow Alaska, which is inside the Arctic Circle, the sun will not officially set today; they will get 24 hours of daylight.
The Summer Solstice had significance for a variety of pre-Christian religions and continues to have significance in some of those religions today.
Enjoy the day light, enjoy the warm summer breezes and the flowers.