September
September · May · June
73climate match
United States · 1991–2020
Best time to visit
Charleston.
September leads for comfortable weather in Charleston: typically 26.4°C by day, 5.2°C at night, with 27 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high26.4°C
Typical low5.2°C
Rain in September27 mm
August
August · July · June
61climate match
May
May · October · September
78climate match
The weakest month is January, scoring 5 against September’s 73 — days reach only 2.7°C, 21° below the 24°C the score treats as ideal, and nights drop to -10.2°C.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
52.7° / -10.2°
Feb
55.2° / -8.4°
Mar
2311.7° / -3.9°
Apr
4416.5° / -0.3°
May
7122.3° / 3.3°
Jun
7127.8° / 6.7°
Jul
6432.3° / 10.5°
Aug
6531.4° / 10°
Sep
7326.4° / 5.2°
Oct
5519.2° / 0.3°
Nov
1710.1° / -4.6°
Dec
53.2° / -9°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 2.7°C | -10.2°C | 47 mm | 7.1 | 9 h 34 | 5 | Good coverage |
| February | 5.2°C | -8.4°C | 36 mm | 6.4 | 10 h 36 | 5 | Good coverage |
| March | 11.7°C | -3.9°C | 29 mm | 5.9 | 11 h 49 | 23 | Good coverage |
| April | 16.5°C | -0.3°C | 32 mm | 6.7 | 13 h 13 | 44 | Good coverage |
| May | 22.3°C | 3.3°C | 34 mm | 6.2 | 14 h 24 | 71 | Good coverage |
| June | 27.8°C | 6.7°C | 24 mm | 4.3 | 15 h 03 | 71 | Good coverage |
| July | 32.3°C | 10.5°C | 14 mm | 3.1 | 14 h 48 | 64 | Good coverage |
| August | 31.4°C | 10°C | 19 mm | 4.2 | 13 h 46 | 65 | Good coverage |
| September | 26.4°C | 5.2°C | 27 mm | 4.5 | 12 h 25 | 73 | Good coverage |
| October | 19.2°C | 0.3°C | 39 mm | 5.9 | 11 h 03 | 55 | Good coverage |
| November | 10.1°C | -4.6°C | 31 mm | 5.6 | 9 h 52 | 17 | Good coverage |
| December | 3.2°C | -9°C | 38 mm | 6.2 | 9 h 18 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.6°C1 Jan 1918 | -37.2°C2 Jan 1952 | 56 mm14 Jan 1909 | 224 mm1909 · driest 0 mm in 1961 | 120 |
| February | 20.0°C24 Feb 1995 | -38.9°C6 Feb 1899 | 51 mm10 Feb 1915 | 149 mm1899 · driest 2 mm in 2010 | 121 |
| March | 26.1°C21 Mar 2004 | -27.2°C8 Mar 1964 | 51 mm22 Mar 1909 | 118 mm1906 · driest 3 mm in 1910 | 120 |
| April | 30.0°C22 Apr 2012 | -17.8°C3 Apr 1917 | 38 mm15 Apr 1896 | 94 mm1963 · driest 4 mm in 1949 | 120 |
| May | 33.3°C26 May 2001 | -9.4°C3 May 1913 | 76 mm3 May 1898 | 179 mm1898 · driest 0 mm in 1974 | 120 |
| June | 37.8°C13 Jun 1918 | -3.9°C17 Jun 1895 | 36 mm1 Jun 1943 | 90 mm1964 · driest 0 mm in 1931 | 120 |
| July | 40.6°C23 Jul 1931 | -2.8°C3 Jul 1921 | 42 mm17 Jul 1932 | 85 mm1896 · driest 0 mm in 2008 | 120 |
| August | 38.9°C1 Aug 2000 | -4.4°C31 Aug 1908 | 35 mm28 Aug 1925 | 89 mm1909 · driest 0 mm in 1895 | 120 |
| September | 36.7°C24 Sep 2001 | -11.1°C25 Sep 1926 | 38 mm8 Sep 1894 | 141 mm1982 · driest 0 mm in 1907 | 120 |
| October | 31.1°C10 Oct 1996 | -14.4°C30 Oct 1971 | 76 mm12 Oct 1899 | 141 mm2004 · driest 0 mm in 1952 | 118 |
| November | 25.6°C15 Nov 1999 | -30.6°C19 Nov 1893 | 41 mm14 Nov 1955 | 112 mm1900 · driest 0 mm in 1939 | 119 |
| December | 20.0°C1 Dec 1995 | -37.8°C25 Dec 1924 | 47 mm31 Dec 1909 | 160 mm2010 · driest 1 mm in 1976 | 120 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 1 | 7 |
| February | 0 | 0 | 27 | <1 | 6 |
| March | <1 | 0 | 26 | <1 | 4 |
| April | 2 | 0 | 17 | <1 | 2 |
| May | 10 | 2 | 6 | <1 | <1 |
| June | 20 | 10 | <1 | <1 | 0 |
| July | 29 | 24 | 0 | <1 | 0 |
| August | 28 | 22 | <1 | <1 | 0 |
| September | 19 | 5 | 3 | <1 | 0 |
| October | 5 | <1 | 15 | 1 | <1 |
| November | <1 | 0 | 25 | <1 | 4 |
| December | 0 | 0 | 29 | 1 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 28% | 5% | 30% | -1.3–4.7°C |
| February | 0% | 27% | 5% | 27% | 0.6–7.5°C |
| March | 3% | 25% | 4% | 23% | 6.1–13.3°C |
| April | 23% | 24% | 3% | 22% | 12.4–18.7°C |
| May | 56% | 22% | 3% | 20% | 17.7–24.1°C |
| June | 81% | 15% | 2% | 10% | 23.2–29.4°C |
| July | 87% | 13% | 2% | 9% | 29.2–33.0°C |
| August | 83% | 17% | 2% | 11% | 28.3–32.1°C |
| September | 77% | 17% | 3% | 13% | 23.0–27.4°C |
| October | 46% | 17% | 4% | 15% | 15.5–21.8°C |
| November | 4% | 21% | 4% | 20% | 6.2–13.3°C |
| December | 0% | 25% | 4% | 24% | -0.7–6.2°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 5772720
- NOAA station
- USC00423809 · HEBER
- Station distance
- 4.7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 22 usable years
- Daylight
- Calculated from latitude 40.47°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.