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However, you can’t really predict if the interest rates are lowest today or will they go down further tomorrow. You can get a fair idea about where the mortgage interest rates are headed through analysis and reports published in newspapers and magazines but there are contrarian views as well. 
Looking for lowest interest rates is good but you should not keep looking for them forever. You need to take a decision at some point and go with a particular mortgage interest rate. Some people just keep looking for the lowest interest rates only to end with the interest rates worse than what they could have got had they acted wisely. Moreover, you will also need to choose the lowest interest rates from the mortgage rate quotes by various mortgage brokers/lenders.
One way of doing this is to use an online mortgage calculator. However, once you have analysed various reports/ articles and have various mortgage offers available, do not delay making your choice.