According to analytics from Mailerlite, the best open rates for emails are on Mondays at 30.3% and Thursdays at 30.6%. 

The worst day of the week for open rates is Sunday at 29.4%

For a deeper dive, most email opens occur between 10 AM and noon (based on the subscriber’s time zone). Monday through Sunday. 

Other noteworthy times to note are: 

5 PM-7 PM

1 AM-2 AM

You can view the full report here.