Short Term
Tomorrow will be another keeper with plenty of sunshine and temps in the 60's, but things will start to change by the end of the day. Winds will start to usher in some colder air by later tomorrow night as a Canadian front moves into the region. Looking at the 850 temps (temps around a mile above the surface) yo can see that we start to see the cold air arriving in the northern sections of the state tomorrow evening.
Mid Range
By Thursday morning it will be apparent that a big cool down has moved into N Georgia as temps will be starting close to freezing around most of the northern sections of the metro. Thursday we will be very cool with highs in the middle 50's and a breezy north wind. Friday looks cool as well with highs in the mid 50's. Then the real cold air will arrive. Highs Saturday and Sunday will be in the upper 40's.