Rock Hill weather in September: Rock Hill, South Carolina: normal highs, lows, rain and records for September
Rock Hill in September has a normal high of 83°F and a normal low of 62°F, a daily mean of 72°F, falling from 86°F on the 1st to 79°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.42 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 17°C, 87 mm of precipitation in September.
- NOAA stationRock Hill York County Airport
- Station IDUSW00053871
- Location34.99°N 81.06°W
- Elevation669 ft (204 m)
- From the center4 miles
- Population75,798
- Jan 52° 31°
- Feb 57° 34°
- Mar 64° 40°
- Apr 74° 48°
- May 80° 57°
- Jun 87° 66°
- Jul 90° 69°
- Aug 89° 68°
- Sep 83° 62°
- Oct 73° 49°
- Nov 63° 39°
- Dec 55° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Rock Hill in September?
The normal high is 83°F and the normal low 62°F, for a daily mean of 72.4°F. September is 6.0°F cooler than August and 11.1°F warmer than October. September is the 4th warmest month of the year in Rock Hill and the 8th wettest. Across the month the normal high falls 7°F, from 86°F on September 1 to 79°F on September 30. From one year to the next September's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 70°F and 75°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 86°F | 66°F | 33% | 17% |
| September 8 | 85°F | 65°F | 32% | 16% |
| September 15 | 83°F | 62°F | 32% | 16% |
| September 22 | 81°F | 60°F | 32% | 16% |
| September 30 | 79°F | 57°F | 33% | 16% |
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 | 86°F | 66°F | 33% | 17% | 13 h |
| September 2 | 86°F | 66°F | 33% | 17% | 12 h 50 min |
| September 3 | 86°F | 66°F | 33% | 17% | 12 h 50 min |
| September 4 | 86°F | 66°F | 32% | 17% | 12 h 50 min |
| September 5 | 86°F | 65°F | 32% | 16% | 12 h 50 min |
| September 6 | 85°F | 65°F | 32% | 16% | 12 h 50 min |
| September 7 | 85°F | 65°F | 32% | 16% | 12 h 40 min |
| September 8 | 85°F | 65°F | 32% | 16% | 12 h 40 min |
| September 9 | 85°F | 64°F | 32% | 16% | 12 h 40 min |
| September 10 | 84°F | 64°F | 32% | 16% | 12 h 40 min |
| September 11 | 84°F | 64°F | 32% | 16% | 12 h 40 min |
| September 12 | 84°F | 63°F | 32% | 16% | 12 h 30 min |
| September 13 | 84°F | 63°F | 32% | 16% | 12 h 30 min |
| September 14 | 83°F | 63°F | 32% | 16% | 12 h 30 min |
| September 15 | 83°F | 62°F | 32% | 16% | 12 h 30 min |
| September 16 | 83°F | 62°F | 32% | 16% | 12 h 20 min |
| September 17 | 83°F | 62°F | 32% | 16% | 12 h 20 min |
| September 18 | 82°F | 61°F | 32% | 16% | 12 h 20 min |
| September 19 | 82°F | 61°F | 32% | 16% | 12 h 20 min |
| September 20 | 82°F | 61°F | 32% | 16% | 12 h 20 min |
| September 21 | 81°F | 60°F | 32% | 16% | 12 h 10 min |
| September 22 | 81°F | 60°F | 32% | 16% | 12 h 10 min |
| September 23 | 81°F | 59°F | 32% | 16% | 12 h 10 min |
| September 24 | 81°F | 59°F | 33% | 16% | 12 h 10 min |
| September 25 | 80°F | 59°F | 33% | 16% | 12 h 10 min |
| September 26 | 80°F | 58°F | 33% | 16% | 12 h |
| September 27 | 80°F | 58°F | 33% | 16% | 12 h |
| September 28 | 79°F | 57°F | 33% | 16% | 12 h |
| September 29 | 79°F | 57°F | 33% | 16% | 12 h |
| September 30 | 79°F | 57°F | 33% | 16% | 11 h 50 min |
- Normal high
- 83°FSeptember average
- Normal low
- 62°FSeptember average
- Precipitation
- 3.42 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 29
- Days at 80°F or more
- 21
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00053871; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Rock Hill in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 1 (33%). In all, 3.42 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Rock Hill, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053871.
What are the records for September in Rock Hill?
The warmest September temperature on this station's record (since 1999) is 98°F, on September 5, 2026; the coldest is 41°F, on September 23, 1999. The wettest September brought 9.63 in (2024).
The September mean against the 1991-2020 normal of 72.4°F: 2021 71.5°F (−0.9), 2022 71.9°F (−0.5), 2023 71.2°F (−1.2), 2024 71.7°F (−0.7), 2026 75.7°F (+3.3). 1 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 71.5°F | −0.9°F | 1.51 in |
| 2022 | 71.9°F | −0.5°F | 1.62 in |
| 2023 | 71.2°F | −1.2°F | 1.26 in |
| 2024 | 71.7°F | −0.7°F | 9.63 in |
| 2026 | 75.7°F | +3.3°F | 1.17 in |
Source: records: ACIS, station USW00053871; recent months: ACIS, station USW00053871. Records and recent months use complete months only.
How does September in Rock Hill 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; Rock Hill's is 83°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Rock Hill in August89°F by day, 68°F at night
- Rock Hill in October73°F by day, 49°F at night
- Rock Hill 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