The weather will remain mild through Sukkoth Eve (Sunday evening), and then a cool front will move through bringing a noticeable chill to the air that will last through this coming week.
In fact, the nighttime lows will probably be the coolest of the year.
However, the beginning of the following week (Erev Simchat Torah) will see the start of a warming trend that will last into mid-the-following week.
The end of this week will also feature more low level moisture, so with the cool temperatures will come some clouds and some light showers. However, it looks like the mid-level moisture (at 700 mb) will stay to our north and so will any more significant rain.