Based on data mined from over 9.5 billion email sends from Mailchimp Saturdays and Sundays tend to have much higher clickthrough rates than those sent during the business week.
The unsubscription rates tend to peak on Tuesday and are the lowest on Thursdays. From an unsubscription perspective, Saturdays are one of the best days.
The one thing I’ve learned from many years of email marketing is that these trends change with the weather. In the meantime, it might be worth thinking about experimenting with sending your email campaigns on Saturdays.