Building on what others have said regarding high indoor humidity being the cause. Some other things you can do:

Make sure there is good airflow to the windows. During the day open curtains or blinds, move obstacles that might block airflow (like a big couch in front of the window), take off screens if they're on the inside. All of this will help get warmer air to the windows to dry them. (Mine get some condensation overnight, but then dry during the day).

Make sure you're getting enough fresh air in (in the winter, this fresh air will also be dry air). Ideally through an HRV, but if not, run your exhaust fans for a while to draw some in.

As others mentioned, if it persists and this stuff doesn't help, try a dehumidifier.