The best times to come to Charleston are late fall (October-November) and late spring (April to early June). The temperatures are mild, crowds sparser, and because children are in school, there are far fewer families. Charleston is best seen on foot, and these are the best times for walking without too much interference from the elements.
Avoid the extremes of both summer and winter when planning your visit to Charleston.
The summer months of June, July and August, and even into September, are hot, humid and miserable, and the city is crowded with tourists. The winter months of January and February are cold and wet, and March is particularly rainy and blustery.
Because Charleston is in a semi-tropical climate, there are nearly always flowers blooming. Camellias, azaleas and magnolias (in that order) begin to flower well in the cooler spring months, and if you schedule your visit in May, you may just catch all three blooming at the same time.
You may also wish to consult the Charleston Visitor Center for information on seasonal House and Garden Tours, which frequently offer showings of private formal gardens.