Weather will likely play an important role when you plan your trip to North Miami Beach, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 84°F, while the coldest months are January and February with an average of 72°F. The rainiest months in North Miami Beach are September, June, August, and July, with each month seeing an average of 8 inches of rainfall.