https://money.usnews.com/loans/mortgages/mortgage-rate-forecast
This is a data-driven form of prediction -- inputs include the current state of the economy, the past few years of data on the Fed's actions, and speculation about future stresses and successes the economy may face.
It's quite difficult, since these rates are so important to your personal decisions that you don't want to risk basing it on one forecast -- ways that we can adjust for this risk are listening to multiple forecasts and considering how reliable each forecast has been in the past.
Additionally, one other important piece of information is changes in predicted interest rates (as mentioned in the article), and what makes the forecasters change their mind -- if there are too many small changes, it can impact how reliable you perceive the forecasts to be (e.g. the economy starts taking a downturn, so forecasters update -- but why didn't they predict the downturn in the first place?).