Climate averages 1991–2020
Clarksville weather
in September.
A warm, moderately wet month: the 4th warmest and one of the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Clarksville: daytime highs average 27.6°C and nights cool to about 17.9°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 82 mm of rain on roughly 8 days, which makes September a moderately wet month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average September day.
The nearest other city in this atlas is Nashville (65 km away). In September its highs average 27.6°C, about as warm as Clarksville, with 83 mm of rain.
Among the 498 cities listed in the United States, Clarksville ranks joint 216th of 498 for the warmest September highs and joint 288th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Clarksville is 0.7°C warmer than that mean.
From September to October, average highs fall by 6.2°C to 21.4°C, and monthly rainfall rises from 82 mm to 91 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
Clarksville climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.5°C-0.7°C | -0.7°C | 100 | 10.0 | 10.010 h |
| February | 10.1°C0.9°C | 0.9°C | 108 | 10.0 | 10.811 h |
| March | 15.1°C4.9°C | 4.9°C | 124 | 11.4 | 11.912 h |
| April | 20.5°C10.2°C | 10.2°C | 125 | 10.8 | 13.113 h |
| May | 25.1°C15.4°C | 15.4°C | 121 | 12.3 | 14.114 h |
| June | 29.6°C20.0°C | 20.0°C | 89 | 12.0 | 14.615 h |
| July | 31.6°C22.1°C | 22.1°C | 97 | 11.8 | 14.414 h |
| August | 31.1°C21.5°C | 21.5°C | 82 | 10.2 | 13.614 h |
| September, selected | 27.6°C17.9°C | 17.9°C | 82 | 7.6 | 12.412 h |
| October | 21.4°C11.8°C | 11.8°C | 91 | 8.2 | 11.311 h |
| November | 14.4°C5.6°C | 5.6°C | 97 | 8.8 | 10.310 h |
| December | 9.3°C1.5°C | 1.5°C | 115 | 10.6 | 9.710 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
- Nashville in SeptemberUnited States · 65 kmHigh 27.6°C · Low 17.7°C · 83 mm rain
- Franklin in SeptemberUnited States · 80 kmHigh 27.5°C · Low 18.0°C · 82 mm rain
- Murfreesboro in SeptemberUnited States · 116 kmHigh 27.7°C · Low 18.0°C · 85 mm rain
- Evansville in SeptemberUnited States · 162 kmHigh 26.7°C · Low 17.5°C · 82 mm rain
- Huntsville in SeptemberUnited States · 212 kmHigh 28.1°C · Low 18.6°C · 92 mm rain
- Louisville in SeptemberUnited States · 238 kmHigh 26.5°C · Low 16.5°C · 77 mm rain
- Chattanooga in SeptemberUnited States · 248 kmHigh 27.5°C · Low 18.1°C · 99 mm rain
- East Chattanooga in SeptemberUnited States · 250 kmHigh 27.4°C · Low 18.0°C · 99 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 Clarksville) is explained once on the Clarksville year overview and on the Sources, method and limits page.