Chattanooga weather in August: Chattanooga, Tennessee: normal highs, lows, rain and records for August
Chattanooga in August has a normal high of 90°F and a normal low of 70°F, a daily mean of 80°F, falling from 91°F on the 1st to 88°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 3.67 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 21°C, 93 mm of precipitation in August.
- NOAA stationChattanooga Airport
- Station IDUSW00013882
- Location35.03°N 85.20°W
- Elevation671 ft (205 m)
- From the center4 miles
- Population191,496
- Jan 51° 32°
- Feb 56° 36°
- Mar 64° 42°
- Apr 74° 50°
- May 81° 59°
- Jun 88° 67°
- Jul 91° 71°
- Aug 90° 70°
- Sep 84° 64°
- Oct 74° 51°
- Nov 62° 40°
- Dec 53° 35°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Chattanooga in August?
The normal high is 90°F and the normal low 70°F, for a daily mean of 80.0°F. August is 0.7°F cooler than July and 6.1°F warmer than September. August is the 2nd warmest month of the year in Chattanooga and the 11th wettest. Across the month the normal high falls 3°F, from 91°F on August 1 to 88°F on August 31. From one year to the next August's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 78°F and 82°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 91°F | 71°F | 34% | 23% |
| August 8 | 91°F | 71°F | 33% | 22% |
| August 15 | 90°F | 71°F | 31% | 21% |
| August 22 | 89°F | 70°F | 30% | 20% |
| August 31 | 88°F | 68°F | 28% | 19% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 91°F | 71°F | 34% | 23% | 14 h |
| August 2 | 91°F | 71°F | 34% | 23% | 13 h 50 min |
| August 3 | 91°F | 71°F | 34% | 23% | 13 h 50 min |
| August 4 | 91°F | 71°F | 33% | 22% | 13 h 50 min |
| August 5 | 91°F | 71°F | 33% | 22% | 13 h 50 min |
| August 6 | 91°F | 71°F | 33% | 22% | 13 h 50 min |
| August 7 | 91°F | 71°F | 33% | 22% | 13 h 50 min |
| August 8 | 91°F | 71°F | 33% | 22% | 13 h 40 min |
| August 9 | 91°F | 71°F | 33% | 22% | 13 h 40 min |
| August 10 | 90°F | 71°F | 32% | 22% | 13 h 40 min |
| August 11 | 90°F | 71°F | 32% | 22% | 13 h 40 min |
| August 12 | 90°F | 71°F | 32% | 22% | 13 h 40 min |
| August 13 | 90°F | 71°F | 32% | 22% | 13 h 30 min |
| August 14 | 90°F | 71°F | 32% | 21% | 13 h 30 min |
| August 15 | 90°F | 71°F | 31% | 21% | 13 h 30 min |
| August 16 | 90°F | 71°F | 31% | 21% | 13 h 30 min |
| August 17 | 90°F | 70°F | 31% | 21% | 13 h 30 min |
| August 18 | 90°F | 70°F | 31% | 21% | 13 h 30 min |
| August 19 | 90°F | 70°F | 30% | 21% | 13 h 20 min |
| August 20 | 90°F | 70°F | 30% | 21% | 13 h 20 min |
| August 21 | 90°F | 70°F | 30% | 20% | 13 h 20 min |
| August 22 | 89°F | 70°F | 30% | 20% | 13 h 20 min |
| August 23 | 89°F | 70°F | 30% | 20% | 13 h 20 min |
| August 24 | 89°F | 70°F | 29% | 20% | 13 h 10 min |
| August 25 | 89°F | 69°F | 29% | 20% | 13 h 10 min |
| August 26 | 89°F | 69°F | 29% | 20% | 13 h 10 min |
| August 27 | 89°F | 69°F | 29% | 19% | 13 h 10 min |
| August 28 | 89°F | 69°F | 29% | 19% | 13 h 10 min |
| August 29 | 88°F | 69°F | 29% | 19% | 13 h |
| August 30 | 88°F | 68°F | 29% | 19% | 13 h |
| August 31 | 88°F | 68°F | 28% | 19% | 13 h |
- Normal high
- 90°FAugust average
- Normal low
- 70°FAugust average
- Precipitation
- 3.67 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 17
- Daylight
- 14 h to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 30
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013882; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Chattanooga in August?
On a given August day the chance of 0.01 inch or more is 31% on average, highest around August 1 (34%). In all, 3.67 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Chattanooga, 17 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013882.
How humid and windy is Chattanooga in August?
At 3 p.m. the normal temperature is 86°F with 48% relative humidity and a dew point of 65°F; at 6 a.m. it is 69°F with 89% humidity. The wind averages 3.8 mph, most often from the north-northeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 69°F | 66°F | 89% | 1.7 mph | 47% |
| 9 a.m. | 76°F | 67°F | 75% | 4.1 mph | 48% |
| noon | 83°F | 66°F | 56% | 5.8 mph | 37% |
| 3 p.m. | 86°F | 65°F | 48% | 6.4 mph | 28% |
| 6 p.m. | 84°F | 65°F | 52% | 6.5 mph | 42% |
| 9 p.m. | 77°F | 67°F | 73% | 2.8 mph | 52% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013882. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Chattanooga?
The warmest August temperature on Chattanooga's official record (since 1879) is 105°F, on August 4, 1947; the coldest is 50°F, on August 31, 1946. The wettest August brought 12.36 in (1920).
The August mean against the 1991-2020 normal of 80.0°F: 2021 80.0°F (at normal), 2022 79.6°F (−0.4), 2023 80.6°F (+0.6), 2024 81.6°F (+1.6), 2025 77.4°F (−2.6), 2026 82.0°F (+2.0). 3 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 80.0°F | at normal | 11.48 in |
| 2022 | 79.6°F | −0.4°F | 6.68 in |
| 2023 | 80.6°F | +0.6°F | 6.76 in |
| 2024 | 81.6°F | +1.6°F | 0.16 in |
| 2025 | 77.4°F | −2.6°F | 8.05 in |
| 2026 | 82.0°F | +2.0°F | 4.14 in |
Source: records: ACIS, NWS threaded record CHAthr; recent months: ACIS, station USW00013882. Records and recent months use complete months only.
How does August in Chattanooga compare across Tennessee?
Across the 116 places PlainClimate covers in Tennessee, August normal highs run from 78°F in Roan Mountain to 92°F in Memphis; Chattanooga's is 90°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.