Chattanooga, TN weather in August
In August, Chattanooga sees highs around 90°F and lows around 70°F: hot and oppressively humid, with some rain. There are about 9 days with rain. It is one of the warmest months in Chattanooga.
- Normal high
- 90°F
- Normal low
- 70°F
- Wet days
- 9
- 3.7 in total
- Muggy days
- 25
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 91°F | 88°F |
| Normal low | 71°F | 68°F |
| Chance of a wet day | 34% | 29% |
| Sunrise / sunset | 6:50 am / 8:44 pm | 7:13 am / 8:09 pm |
| Daylight | 13.9 h | 12.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical August day
- 6 am71°Fdew point 68°F
- 9 am77°Fdew point 68°F
- Noon85°Fdew point 68°F
- 3 pm88°Fdew point 66°F
- 6 pm85°Fdew point 67°F
- 9 pm78°Fdew point 69°F
NOAA hourly normals (local standard time) from Chattanooga Lovell Airport (6 mi away); average wind 4 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Hot dayshigh 90°F or more17 of 31
- Muggy daysdaily mean dew point 65°F or more25 of 31
- Wet daysat least 0.01 in of rain or melted snow9 of 31
- Notable rainat least 0.10 in6 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 3.7 in; a dry August brings about 2.8 in and a wet one about 4.7 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202007: average high 97°F
- Coolest August1992: average high 83°F
- Wettest August2015: 7.1 in
- Driest August2011: 0.01 in
- Highest reading105°F (August 23, 2007)
- Lowest reading53°F (August 30, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 91°F | 90°F | 84°F |
| Normal low | 71°F | 70°F | 64°F |
| Wet days | 12 | 9 | 8 |
| Comfortable days | 0 | 0 | 5 |
| Daylight | 14.2 h | 13.4 h | 12.4 h |
Highs change by -1°F from July and -6°F into September.
Nearby alternatives in August
- Cooler: Gatlinburg, TN111 mi · high 82°F · 14 wet days
How Chattanooga ranks in August
- Normal high138th warmest of 378 cities; 3rd of 7 in Tennessee
- Wet days216th driest of 378
- Comfortable days238th most of 341
What to pack for Chattanooga in August
- Light, breathable clothing – highs near 90°F and about 25 muggy days
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
August has 0 heating degree days and 465 cooling degree days (base 65°F), 9% of the year's total heating and cooling demand.
Questions
How hot is Chattanooga in August?
The normal high is 90°F and the normal low is 70°F. From 1991 to 2020 the hottest August reading was 105°F (August 23, 2007).
Does it rain a lot in Chattanooga in August?
About 9 days in August have at least 0.01 in of precipitation, and the normal total is 3.7 in. The wettest August in 1991-2020 was in 2015 (7.1 in); the driest was in 2011 (0.01 in).
Is August a good time to visit Chattanooga?
August ranks 12th of 12 months on our comfort score for Chattanooga (40 out of 100). It has almost no comfortable days and about 17 days at 90°F or hotter. The best months are April and October.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates and humidity and wind by hour: Chattanooga Lovell Airport (USW00013882), 6.2 mi E of the city center, 671 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Lovell Field Airport (723240-13882), 6.3 mi E of the city center, 669 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).