Climate averages 1991–2020
Chattanooga 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 Chattanooga: daytime highs average 30.5°C and nights cool to about 21.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 85 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 28 min on an average August day.
The nearest other city in this atlas is East Chattanooga (6 km away). In August its highs average 30.3°C, about as warm as Chattanooga, with 85 mm of rain.
Among the 498 cities listed in the United States, Chattanooga ranks joint 197th of 498 for the warmest August highs and joint 291st of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Chattanooga is 0.6°C warmer than that mean.
From August to September, average highs fall by 2.9°C to 27.5°C, and monthly rainfall rises from 85 mm to 99 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
Chattanooga climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.6°C0.6°C | 0.6°C | 119 | 10.2 | 10.110 h |
| February | 11.9°C2.1°C | 2.1°C | 113 | 10.2 | 10.911 h |
| March | 16.3°C5.6°C | 5.6°C | 133 | 11.6 | 11.912 h |
| April | 21.2°C10.0°C | 10.0°C | 120 | 10.3 | 13.013 h |
| May | 25.4°C14.9°C | 14.9°C | 101 | 10.6 | 14.014 h |
| June | 29.3°C19.5°C | 19.5°C | 95 | 12.9 | 14.514 h |
| July | 30.9°C21.6°C | 21.6°C | 105 | 13.2 | 14.314 h |
| August, selected | 30.5°C21.2°C | 21.2°C | 85 | 11.3 | 13.513 h |
| September | 27.5°C18.1°C | 18.1°C | 99 | 8.0 | 12.412 h |
| October | 22.0°C12.0°C | 12.0°C | 84 | 7.1 | 11.311 h |
| November | 15.5°C5.9°C | 5.9°C | 106 | 8.7 | 10.410 h |
| December | 10.8°C2.3°C | 2.3°C | 128 | 10.3 | 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
- East Chattanooga in AugustUnited States · 6 kmHigh 30.3°C · Low 21.0°C · 85 mm rain
- Huntsville in AugustUnited States · 122 kmHigh 31.0°C · Low 21.7°C · 78 mm rain
- Murfreesboro in AugustUnited States · 132 kmHigh 30.8°C · Low 21.3°C · 85 mm rain
- Roswell in AugustUnited States · 143 kmHigh 30.0°C · Low 21.1°C · 104 mm rain
- Sandy Springs in AugustUnited States · 151 kmHigh 30.0°C · Low 21.2°C · 99 mm rain
- Johns Creek in AugustUnited States · 152 kmHigh 30.2°C · Low 21.4°C · 104 mm rain
- Knoxville in AugustUnited States · 162 kmHigh 29.4°C · Low 19.9°C · 86 mm rain
- Atlanta in AugustUnited States · 167 kmHigh 30.1°C · Low 21.1°C · 96 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 Chattanooga) is explained once on the Chattanooga year overview and on the Sources, method and limits page.
East Chattanooga lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.