If you haven’t started taking your houseplants in, you should do it soon. Night temperatures in the 40s and 50s can damage tropical plants. There are a few things to consider before putting your plants back inside, though.
Inspect your plants thoroughly for disease and insects. It would have been best to start a few weeks before you plan to bring them inside to have time to solve any problems that may exist.
However, you don’t have that time luxury now.