Summerville weather in September: Summerville, South Carolina: normal highs, lows, rain and records for September
Summerville in September has a normal high of 85°F and a normal low of 65°F, a daily mean of 75°F, falling from 88°F on the 1st to 81°F by the 30th. The month brings 5.88 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 18°C, 149 mm of precipitation in September.
- NOAA stationSummerville (4 mi W)
- Station IDUSC00388426
- Location33.04°N 80.23°W
- Elevation65 ft (20 m)
- Population52,625
- Jan 58° 35°
- Feb 62° 37°
- Mar 69° 42°
- Apr 76° 50°
- May 82° 59°
- Jun 87° 67°
- Jul 90° 71°
- Aug 90° 70°
- Sep 85° 65°
- Oct 77° 53°
- Nov 68° 42°
- Dec 61° 37°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Summerville in September?
The normal high is 85°F and the normal low 65°F, for a daily mean of 74.8°F. September is 5.3°F cooler than August and 10.0°F warmer than October. September is the 4th warmest month of the year in Summerville and the 3rd wettest. Across the month the normal high falls 7°F, from 88°F on September 1 to 81°F on September 30. From one year to the next September's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 73°F and 77°F.
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 88°F | 69°F | – | – |
| September 8 | 87°F | 67°F | – | – |
| September 15 | 85°F | 65°F | – | – |
| September 22 | 83°F | 63°F | – | – |
| September 30 | 81°F | 60°F | – | – |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 88°F | 69°F | – | – | 12 h 50 min |
| September 2 | 88°F | 68°F | – | – | 12 h 50 min |
| September 3 | 88°F | 68°F | – | – | 12 h 50 min |
| September 4 | 87°F | 68°F | – | – | 12 h 50 min |
| September 5 | 87°F | 68°F | – | – | 12 h 50 min |
| September 6 | 87°F | 68°F | – | – | 12 h 40 min |
| September 7 | 87°F | 67°F | – | – | 12 h 40 min |
| September 8 | 87°F | 67°F | – | – | 12 h 40 min |
| September 9 | 86°F | 67°F | – | – | 12 h 40 min |
| September 10 | 86°F | 67°F | – | – | 12 h 40 min |
| September 11 | 86°F | 66°F | – | – | 12 h 30 min |
| September 12 | 86°F | 66°F | – | – | 12 h 30 min |
| September 13 | 85°F | 66°F | – | – | 12 h 30 min |
| September 14 | 85°F | 66°F | – | – | 12 h 30 min |
| September 15 | 85°F | 65°F | – | – | 12 h 30 min |
| September 16 | 85°F | 65°F | – | – | 12 h 20 min |
| September 17 | 84°F | 65°F | – | – | 12 h 20 min |
| September 18 | 84°F | 64°F | – | – | 12 h 20 min |
| September 19 | 84°F | 64°F | – | – | 12 h 20 min |
| September 20 | 84°F | 64°F | – | – | 12 h 20 min |
| September 21 | 83°F | 63°F | – | – | 12 h 10 min |
| September 22 | 83°F | 63°F | – | – | 12 h 10 min |
| September 23 | 83°F | 63°F | – | – | 12 h 10 min |
| September 24 | 83°F | 62°F | – | – | 12 h 10 min |
| September 25 | 82°F | 62°F | – | – | 12 h 10 min |
| September 26 | 82°F | 62°F | – | – | 12 h |
| September 27 | 82°F | 61°F | – | – | 12 h |
| September 28 | 82°F | 61°F | – | – | 12 h |
| September 29 | 81°F | 60°F | – | – | 12 h |
| September 30 | 81°F | 60°F | – | – | 12 h |
- Normal high
- 85°FSeptember average
- Normal low
- 65°FSeptember average
- Precipitation
- 5.88 inmonth total
- Days at 90°F or more
- 9
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 26
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00388426; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Summerville in September?
In a normal September in Summerville, 9 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00388426.
What are the records for September in Summerville?
The warmest September temperature on this station's record (since 1898) is 107°F, on September 21, 1925; the coldest is 40°F, on September 30, 1967. The wettest September brought 16.15 in (1928).
The September mean against the 1991-2020 normal of 74.8°F: 2022 76.5°F (+1.7), 2023 75.3°F (+0.5), 2025 74.6°F (−0.2), 2026 78.0°F (+3.2). 3 of 4 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 76.5°F | +1.7°F | 2.09 in |
| 2023 | 75.3°F | +0.5°F | 2.78 in |
| 2025 | 74.6°F | −0.2°F | 1.41 in |
| 2026 | 78.0°F | +3.2°F | 0.70 in |
Source: records: ACIS, station USC00388426; recent months: ACIS, station USC00388426. Records and recent months use complete months only.
How does September in Summerville compare across South Carolina?
Across the 73 places PlainClimate covers in South Carolina, September normal highs run from 71°F in Caesars Head to 87°F in Barnwell; Summerville's is 85°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Summerville in August90°F by day, 70°F at night
- Summerville in October77°F by day, 53°F at night
- Summerville through the yearEvery month, frost dates, records and recent years
- South Carolina in SeptemberThe statewide normal and the warmest and coolest places
- Barnwell: South Carolina's warmest Septembernormal high 87°F