day of week rates lowest?

The day of the week doesn't make a difference, economic data and what the financing markets are doing do...

There is never a particular day when rates are the lowest- It depends on severaleconomic indicators that drive the market-

Days that end in Y are good.... OK, just joking, but there really is no one day of the week that is better than any other day. I've heard all sorts of stories over the years, but there really is no pattern.

Joe Metzler beat me to the punch on the best answer.