Illinois mortgage rates have slightly decreased recently but remain higher than a few months ago. The average APR for a 30-year fixed mortgage is 6.668%, and for a 15-year fixed mortgage, 5.845%. Refinance rates also saw minor drops, with the 30-year fixed refinance at 6.725%. Rates in Illinois are slightly below national averages. To secure the best rates, buyers should maintain strong credit, shop lenders, and consider a 20% down payment.