Charleston Downtown, SC
South Carolina · Records since 1893–2026
⛅ 83°F
Feels like 91°
Currently in Charleston Downtown
As of 8:00 PM EDT
Records for July 28
🔥 Record High
100°F
July 28, 1936
+12° from 88° normal❄ Record Low
67°F
July 28, 1920
-10° from 77° normal
🌞 Normal high: 88°F 🌑 Normal low: 77°F 1991–2020 normals
All-Time Records — Charleston Downtown
104°F
Hottest Day Ever
Jun 2, 1985
7°F
Coldest Day Ever
Feb 14, 1899
10.38"
Wettest Day Ever
Jun 11, 1973
3.2"
Most Snow in One Day
Feb 13, 1899
Top 10 Record Highs — July 28
| # | Temp | Date |
|---|---|---|
| 🏆 | 100°F | July 28, 1936 |
| 2 | 98°F | July 28, 1968 |
| 3 | 98°F | July 28, 1949 |
| 4 | 97°F | July 28, 1999 |
| 5 | 97°F | July 28, 1925 |
| 6 | 96°F | July 28, 1934 |
| 7 | 95°F | July 28, 2025 |
| 8 | 95°F | July 28, 1976 |
| 9 | 95°F | July 28, 1941 |
| 10 | 95°F | July 28, 1917 |
Top 5 Record Lows — July 28
| # | Temp | Date |
|---|---|---|
| 🥶 | 67°F | July 28, 1920 |
| 2 | 69°F | July 28, 1939 |
| 3 | 69°F | July 28, 1911 |
| 4 | 70°F | July 28, 2007 |
| 5 | 70°F | July 28, 1909 |
Heat Wave Summary — Charleston Downtown
threshold: 93°F (90th percentile of historical Jun–Aug highs)3.9
Avg heat wave length
days (historical)
97°
Avg peak temp
during heat waves
69
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far
2026 Daily High Temperature vs Normal
Year to date
Above normal
Below normal
114 of 207 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1893–202619
2026 so far
30
Avg/year 1970–2025
24
Avg/year (last 10 complete)
71
Most in a year (1998)
Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Charleston Downtown
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 20, 1999 – Aug 2, 1999 | 14 | 103°F (Aug 1) | 96°F | 82°F |
| 2 | Jun 23, 1952 – Jun 30, 1952 | 8 | 103°F (Jun 26) | 98°F | 80°F |
| 3 | Sep 1, 1944 – Sep 7, 1944 | 7 | 100°F (Sep 4) | 96°F | 76°F |
| 4 | Jun 21, 1950 – Jun 27, 1950 | 7 | 99°F (Jun 24) | 97°F | 79°F |
| 5 | Jun 25, 1977 – Jul 1, 1977 | 7 | 99°F (Jun 28) | 96°F | 76°F |
| 6 | Jul 6, 1977 – Jul 12, 1977 | 7 | 99°F (Jul 9) | 97°F | 80°F |
| 7 | Jul 29, 1970 – Aug 4, 1970 | 7 | 98°F (Aug 1) | 95°F | 78°F |
| 8 | Aug 20, 1968 – Aug 26, 1968 | 7 | 97°F (Aug 24) | 94°F | 80°F |
| 9 | Aug 4, 1984 – Aug 10, 1984 | 7 | 96°F (Aug 7) | 94°F | 77°F |
| 10 | Jun 26, 1902 – Jul 1, 1902 | 6 | 101°F (Jul 1) | 97°F | 79°F |
Heat Waves Per Year
Warm Summer Nights (Jun–Aug)
Nights where the overnight low exceeded the 1991–2020 normal low
39
2026 so far
above-normal nights
37.6
Avg / summer
1970–2020
78
Most in a summer
1998
Above-Normal Summer Nights Per Year
Average June–August Low by Decade
Overnight lows · complete decades only
Precipitation
Actual vs. 1991–2020 full-month and full-season normals
13.39"
2026 YTD
Normal: 22.92"
-9.53"
4.32"
July so far
July normal: 5.08"
-0.76"
6.73"
Summer so far
Summer normal: 16.04"
-9.31"
3
2026 heavy rain days
Days with ≥ 1.0"
Monthly Precipitation — Last 24 Months
Blue = actual · dashed line = monthly normal
Annual Precipitation Per Year (1970–2026)
Blue = above average · tan = below average · gold = 2026 (partial)
Heavy Rain Days Per Year (≥ 1.0")
Compare year-to-year changes in days with heavy rainfall (≥ 1.0")