The period started on Monday, June 16, with warm and humid summertime and diurnal scattered showers and thunderstorms. A slow-moving front to the north of the region helped trigger strong to severe thunderstorms across portions of the state late Tuesday evening. Widespread wind damage across the Upstate was reported late Tuesday evening, including Anderson, Greenville, Oconee, Pickens, and Spartanburg counties. Strong storms caused minor wind damage in Fairfield, Lexington, and Newberry counties. The National Weather Service (NWS) station at the Anderson County Airport recorded a wind gust of 60 mph as the storms moved through on Tuesday night.
The warm and humid summertime weather persisted through the middle of the week with above-average temperatures. Low temperatures on Thursday morning ranged from 5 to 10 degrees above normal. The NWS station at Charleston International Airport reported a low of 79 degrees, breaking the daily high minimum temperature record of 78 degrees set in 2015. The low of 76 degrees at the NWS Columbia station tied the daily high minimum temperature record established in 2018. Humid conditions and high temperatures in the 90s caused heat index values to surpass 105 degrees in some areas, with the station at Mount Pleasant Airport recording a peak heat index of 108 degrees on Thursday. Strong thunderstorms developed in the late afternoon and early evening as a cold front approached.
Conditions on Friday and Saturday were dry primarily behind the front, as the weak frontal boundary stalled along the coast, triggering isolated showers and storms, mainly east of Interstate 95. Temperatures continued to rise through the weekend. On Sunday, June 22, a strong and broad high pressure settled into the Mid-Atlantic, causing temperatures to continue rising into the next period. While high temperatures ranged from the upper 80s in the Upstate to the lower 90s elsewhere across the state, heat index values exceeded 100 degrees in the Midlands and Coastal Plain, and in the mid- to upper 90s in the Upstate.
(Note: The highest and lowest official temperatures and highest precipitation totals provided below are based on observations from the National Weather Service (NWS) Cooperative Observer network and the National Weather Service's Forecast Offices.)| Weekly* | Since Jan 1 | Departure | |
|---|---|---|---|
| Anderson Airport | 0.70 | 20.56 | -2.2 |
| Greer Airport | 0.38 | 24.04 | 0.6 |
| Charlotte, NC Airport | 0.38 | 18.48 | -1.8 |
| Columbia Metro Airport | Trace | 22.66 | 2.2 |
| Orangeburg 2 (COOP) | 0.00M | 24.90M | 1.9M |
| Augusta, GA Airport | 0.02 | 22.84 | 1.7 |
| Florence Airport | 0.00 | 17.30 | -2.0 |
| North Myrtle Beach Airport | 0.10 | 15.84 | -2.6 | Charleston Air Force Base | 0.01 | 16.62 | -4.3 |
| Savannah, GA Airport | 0.11 | 20.90 | -0.6 |
| *Weekly precipitation totals ending midnight Sunday. M - denotes total with missing values. s - denotes total with suspect data. |
4-inch depth soil temperature: Columbia: 80 degrees. Barnwell: 75 degrees. Mullins: 71 degrees.
After multiple periods of beneficial rainfall, most of the state received less than half an inch of rain during this period. However, some isolated showers and thunderstorm activity produced pockets of up to one inch of rainfall along the South Carolina coast and parts of the Upstate. The U.S. Drought Monitor map, released on Thursday, June 19, indicated that rainfall over the past thirty days had alleviated abnormally dry and drought conditions across the state: the first time since October 2024.
Despite the lack of precipitation during the period, the rain over the past few weeks kept the 14-day average streamflow values at normal to above-normal levels. The river heights that rose to action or the minor flood stage in the previous period fell below those thresholds by the end of the period. Tidal gauges reported values that were below the action stage during the period.
