Rainfall totals Charleston, SC
For Charleston, the official rainfall for the year to date is 18.31 inches through Aug 21, 2026, according to the National Weather Service daily climate report. The normal for that date is 33.87 inches.
Data from Charleston International Airport, with records back to 1937.
Official rainfall report for Aug 21, 2026
| Measured | Normal | |
|---|---|---|
| Rain on Aug 21, 2026 | T | 0.22 inches |
| Month to date | 2.47 inches | 4.68 inches |
| Year to date | 18.31 inches | 33.87 inches |
| Record for Aug 21 | 2.25 inches | 1988 |
Source: National Weather Service daily climate report for CHARLESTOWN MUNI, issued the morning after Aug 21, 2026. The local National Weather Service office issues the daily climate report for the airport station the next morning, and that report is the official figure.
Days with measurable rain, 2026
| Date | Rainfall |
|---|---|
| Aug 19, 2026 | 0.02 inches |
| Aug 16, 2026 | 0.32 inches |
| Aug 15, 2026 | 0.66 inches |
| Aug 14, 2026 | 0.01 inches |
| Aug 13, 2026 | 0.05 inches |
| Aug 9, 2026 | 0.01 inches |
| Aug 8, 2026 | 0.02 inches |
| Aug 6, 2026 | 0.20 inches |
| Aug 3, 2026 | 0.13 inches |
| Aug 2, 2026 | 0.99 inches |
| Jul 29, 2026 | 0.64 inches |
| Jul 26, 2026 | 0.32 inches |
| Jul 25, 2026 | 0.25 inches |
| Jul 24, 2026 | 0.05 inches |
| Jul 21, 2026 | 0.01 inches |
| Jul 14, 2026 | 0.09 inches |
| Jul 12, 2026 | 0.10 inches |
| Jul 11, 2026 | 0.06 inches |
| Jul 10, 2026 | 2.01 inches |
| Jul 8, 2026 | 0.61 inches |
| Jul 7, 2026 | 0.12 inches |
| Jul 5, 2026 | 0.57 inches |
| Jun 27, 2026 | 0.30 inches |
| Jun 26, 2026 | 0.03 inches |
| Jun 21, 2026 | 0.08 inches |
| Jun 19, 2026 | 0.33 inches |
| Jun 18, 2026 | 0.11 inches |
| Jun 17, 2026 | 0.16 inches |
| Jun 16, 2026 | 0.01 inches |
| Jun 14, 2026 | 0.05 inches |
Through Aug 19, 2026, the GHCN-Daily station record shows 18.25 inches of measurable rain so far this year, falling over a 65-day span. Station observations are from GHCN-Daily, with a 1-3 day lag and quality checks by NOAA.
All-time rainfall records
| Wettest day | 11.50 inches | Oct 3, 2015 |
|---|---|---|
| Wettest year | 74.89 inches | 2015 |
| Driest year | 30.31 inches | 1954 |
| Average year | 51.61 inches | 88 complete years on record |
| Rain days a year | 112 | average, 0.01 inch or more |
| Record begins | 1937 | 32,679 daily readings |
Monthly rainfall normals
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inches | 3.37 | 3.05 | 3.35 | 3.29 | 3.32 | 6.21 | 6.60 | 6.97 | 6.01 | 4.33 | 2.66 | 3.35 | 52.51 |
Averages are 1991-2020 normals from NCEI.
The daily climate report is issued by the local National Weather Service forecast office and delivered to this page by the Iowa Environmental Mesonet of Iowa State University. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.