Historical weather data, all-time temperature records, and monthly climate averages for Hanahan, SC. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Hanahan runs mild, with an average high of 74° and low of 51° across 89 years of records. There's a 30% shot of rain, though snow is essentially off the table. The date has swung from a balmy 89° in 1978 down to a sharp 34° in 1975—spring here keeps you guessing.
Hanahan's weather has real teeth at the extremes: the mercury has hit 105° in August and crashed to 6° in January, a 99-degree spread over the station's history. The wettest single day on record dumped 11.5 inches on October 3, 2015, and a rare 6-inch snowfall on December 23, 1989, remains the benchmark for winter drama here.
Hanahan runs hot and long in summer, with average highs in the 88–91° range from June through August and a peak week of 91° in mid-July. If you're avoiding the heat, January through February—with highs in the low 60s—is the coolest window. Rain is spread fairly evenly year-round, but late July is the wettest stretch, averaging nearly 1.8 inches in a single week.