Climate averages 1991–2020
Knoxville weather
in August.
A hot, moderately wet month: the 2nd warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Knoxville: daytime highs average 29.4°C and nights cool to about 19.9°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 86 mm of rain on roughly 11 days, which makes August a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 31 min on an average August day.
The nearest other city in this atlas is Asheville (130 km away). In August its highs average 27.1°C, 2.4°C cooler than Knoxville, with 105 mm of rain.
Among the 498 cities listed in the United States, Knoxville ranks joint 270th of 498 for the warmest August highs and joint 305th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Knoxville is 0.5°C cooler than that mean.
From August to September, average highs fall by 2.7°C to 26.7°C, and monthly rainfall rises from 86 mm to 90 mm.
The annual picture
August 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
Knoxville climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.3°C-0.6°C | -0.6°C | 111 | 10.7 | 10.010 h |
| February | 10.6°C0.8°C | 0.8°C | 110 | 10.9 | 10.911 h |
| March | 15.0°C4.2°C | 4.2°C | 123 | 12.2 | 11.912 h |
| April | 20.0°C8.8°C | 8.8°C | 109 | 10.9 | 13.113 h |
| May | 24.1°C13.8°C | 13.8°C | 94 | 11.7 | 14.014 h |
| June | 28.3°C18.3°C | 18.3°C | 93 | 13.2 | 14.615 h |
| July | 29.8°C20.5°C | 20.5°C | 119 | 14.8 | 14.314 h |
| August, selected | 29.4°C19.9°C | 19.9°C | 86 | 11.4 | 13.514 h |
| September | 26.7°C16.8°C | 16.8°C | 90 | 8.3 | 12.412 h |
| October | 20.9°C10.5°C | 10.5°C | 74 | 7.7 | 11.311 h |
| November | 14.6°C4.5°C | 4.5°C | 96 | 8.9 | 10.310 h |
| December | 9.9°C1.2°C | 1.2°C | 117 | 10.6 | 9.810 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
August in nearby cities
- Asheville in AugustUnited States · 130 kmHigh 27.1°C · Low 17.7°C · 105 mm rain
- East Chattanooga in AugustUnited States · 156 kmHigh 30.3°C · Low 21.0°C · 85 mm rain
- Chattanooga in AugustUnited States · 162 kmHigh 30.5°C · Low 21.2°C · 85 mm rain
- Johns Creek in AugustUnited States · 216 kmHigh 30.2°C · Low 21.4°C · 104 mm rain
- Roswell in AugustUnited States · 219 kmHigh 30.0°C · Low 21.1°C · 104 mm rain
- Murfreesboro in AugustUnited States · 223 kmHigh 30.8°C · Low 21.3°C · 85 mm rain
- Athens, United States in AugustUnited States · 228 kmHigh 30.8°C · Low 21.5°C · 108 mm rain
- Sandy Springs in AugustUnited States · 230 kmHigh 30.0°C · Low 21.2°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 Knoxville) is explained once on the Knoxville year overview and on the Sources, method and limits page.