Planning for the weather is a good way to make your trip to Atlantic City relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are February and January, with an average of -4°C. The snowiest months in Atlantic City are April, March, February and November, with each month seeing an average of 39 cm of snowfall.