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RELIGIOUS RESTRICTIONS
There are no weddings on:
The Sabbath (Friday to Saturday 30 minutes after sundown).

The major holidays; you know, the usuals: Rosh Hashanah, Yom Kippur, Passover, Shavuot, and Sukkot (sundown to sundown). Basically, every holiday you probably celebrated or heavily discussed at Hebrew school (though you may not remember because you were distracted with the happy possibility of being invited to Seth Silverstein’s Bar Mitzvah where you may be able to play Pepsi-7up and sit on his knee).

Orthodox and conservative congregations also don’t permit weddings during The “Three Weeks” (which are the 17th of Tammuz to the 9th of Av, which usually fall in July and August) and the Sefirah period (these are the 7 weeks between Passover and Shavuot, except for the holiday of Lag b’Omer, which is usually in April and May).
These times are actually considered national mourning periods due to historical tragedies such as the destruction of the Temple and a plague that forced its way through the greatest and noblest scholars of the time.

And, this brings us to the reason why June is the most popular time of year for a not-too-hot, not-too-cold wedding.

From The Wedding Yentas