Climate averages 1991–2020
Rock Hill weather
in September.
A warm, wet month: the 4th warmest and the joint 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Rock Hill: daytime highs average 27.4°C and nights cool to about 18.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 93 mm of rain on roughly 8 days, which makes September a wet month (the joint 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Charlotte (37 km away). In September its highs average 27.1°C, about as warm as Rock Hill, with 98 mm of rain.
Among the 498 cities listed in the United States, Rock Hill ranks joint 227th of 498 for the warmest September highs and joint 358th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Rock Hill is 0.5°C warmer than that mean.
From September to October, average highs fall by 5.4°C to 22.0°C, and monthly rainfall falls from 93 mm to 83 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Rock Hill climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.5°C1.5°C | 1.5°C | 95 | 9.5 | 10.110 h |
| February | 12.6°C2.9°C | 2.9°C | 87 | 8.8 | 10.911 h |
| March | 16.7°C6.2°C | 6.2°C | 107 | 9.9 | 11.912 h |
| April | 21.8°C10.8°C | 10.8°C | 89 | 8.7 | 13.013 h |
| May | 26.2°C15.7°C | 15.7°C | 73 | 9.6 | 14.014 h |
| June | 29.8°C20.1°C | 20.1°C | 96 | 11.8 | 14.514 h |
| July | 31.6°C22.1°C | 22.1°C | 93 | 13.5 | 14.314 h |
| August | 30.4°C21.4°C | 21.4°C | 102 | 11.5 | 13.513 h |
| September, selected | 27.4°C18.4°C | 18.4°C | 93 | 8.4 | 12.412 h |
| October | 22.0°C12.4°C | 12.4°C | 83 | 6.9 | 11.311 h |
| November | 16.2°C6.7°C | 6.7°C | 80 | 7.5 | 10.410 h |
| December | 11.9°C3.1°C | 3.1°C | 96 | 9.1 | 9.910 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Charlotte in SeptemberUnited States · 37 kmHigh 27.1°C · Low 17.7°C · 98 mm rain
- Gastonia in SeptemberUnited States · 40 kmHigh 26.9°C · Low 18.0°C · 97 mm rain
- Concord (North Carolina), United States in SeptemberUnited States · 67 kmHigh 27.2°C · Low 18.1°C · 103 mm rain
- Columbia (South Carolina), United States in SeptemberUnited States · 103 kmHigh 28.3°C · Low 19.0°C · 94 mm rain
- High Point in SeptemberUnited States · 147 kmHigh 26.3°C · Low 17.1°C · 105 mm rain
- Winston-Salem in SeptemberUnited States · 149 kmHigh 26.4°C · Low 17.0°C · 101 mm rain
- Asheville in SeptemberUnited States · 158 kmHigh 24.2°C · Low 14.8°C · 95 mm rain
- Greensboro in SeptemberUnited States · 170 kmHigh 26.2°C · Low 17.1°C · 105 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rock Hill) is explained once on the Rock Hill year overview and on the Sources, method and limits page.