Atlanta is known for heat and humidity, but May is a relatively mild time of year. During the latter part of the month, the high temperatures (Fahrenheit) typically range from mid-70s to upper 80s, while the low temperatures tend to be in the upper 50s to mid-60s. On average, it rains in Atlanta about 3.5 inches during the entire month; most days are clear. The average relative humidity for May is 54-82%.
Of course, your interpretation of the weather depends on your perspective. If you live in a hot climate, May in Atlanta will probably seem mild and pleasant. Those living in colder climates may find some of the days to be summer-like or to make them feel like they are “burning slap up.” As for the humidity, if you are used to humid weather, May should be fairly mild, especially in the afternoons and evenings. If you are used to a cooler and/or dryer climate, there is a potential for a day or two where you might observe that, “It’s a steam bath out here.” The important thing to remember is that air conditioning is ample in Atlanta. You may even find yourself wearing a sweater indoors!