Knoxville weather in August: Knoxville, Tennessee: normal highs, lows, rain and records for August
Knoxville in August has a normal high of 88°F and a normal low of 68°F, a daily mean of 78°F, falling from 88°F on the 1st to 87°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 3.63 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 20°C, 92 mm of precipitation in August.
- NOAA stationKnoxville Airport
- Station IDUSW00013891
- Location35.82°N 83.99°W
- Elevation962 ft (293 m)
- From the center11 miles
- Population198,722
- Jan 48° 30°
- Feb 53° 33°
- Mar 61° 40°
- Apr 71° 48°
- May 79° 57°
- Jun 86° 65°
- Jul 88° 69°
- Aug 88° 68°
- Sep 83° 61°
- Oct 72° 49°
- Nov 60° 38°
- Dec 51° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Knoxville in August?
The normal high is 88°F and the normal low 68°F, for a daily mean of 77.6°F. August is 0.9°F cooler than July and 5.8°F warmer than September. August is the 2nd warmest month of the year in Knoxville and the 10th wettest. Across the month the normal high falls 1°F, from 88°F on August 1 to 87°F on August 31. From one year to the next August's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 75°F and 80°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 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 88°F | 69°F | 35% | 24% |
| August 8 | 88°F | 68°F | 34% | 23% |
| August 15 | 88°F | 68°F | 33% | 22% |
| August 22 | 88°F | 67°F | 30% | 20% |
| August 31 | 87°F | 66°F | 28% | 18% |
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 | 88°F | 69°F | 35% | 24% | 14 h |
| August 2 | 88°F | 69°F | 35% | 24% | 14 h |
| August 3 | 88°F | 69°F | 35% | 24% | 14 h |
| August 4 | 88°F | 69°F | 35% | 24% | 13 h 50 min |
| August 5 | 88°F | 69°F | 35% | 23% | 13 h 50 min |
| August 6 | 88°F | 69°F | 35% | 23% | 13 h 50 min |
| August 7 | 88°F | 68°F | 34% | 23% | 13 h 50 min |
| August 8 | 88°F | 68°F | 34% | 23% | 13 h 50 min |
| August 9 | 88°F | 68°F | 34% | 23% | 13 h 40 min |
| August 10 | 88°F | 68°F | 34% | 23% | 13 h 40 min |
| August 11 | 88°F | 68°F | 34% | 22% | 13 h 40 min |
| August 12 | 88°F | 68°F | 34% | 22% | 13 h 40 min |
| August 13 | 88°F | 68°F | 33% | 22% | 13 h 40 min |
| August 14 | 88°F | 68°F | 33% | 22% | 13 h 40 min |
| August 15 | 88°F | 68°F | 33% | 22% | 13 h 30 min |
| August 16 | 88°F | 68°F | 33% | 21% | 13 h 30 min |
| August 17 | 88°F | 68°F | 32% | 21% | 13 h 30 min |
| August 18 | 88°F | 68°F | 32% | 21% | 13 h 30 min |
| August 19 | 88°F | 67°F | 32% | 21% | 13 h 30 min |
| August 20 | 88°F | 67°F | 31% | 20% | 13 h 20 min |
| August 21 | 88°F | 67°F | 31% | 20% | 13 h 20 min |
| August 22 | 88°F | 67°F | 30% | 20% | 13 h 20 min |
| August 23 | 88°F | 67°F | 30% | 19% | 13 h 20 min |
| August 24 | 87°F | 67°F | 30% | 19% | 13 h 20 min |
| August 25 | 87°F | 67°F | 29% | 19% | 13 h 10 min |
| August 26 | 87°F | 66°F | 29% | 19% | 13 h 10 min |
| August 27 | 87°F | 66°F | 29% | 18% | 13 h 10 min |
| August 28 | 87°F | 66°F | 28% | 18% | 13 h 10 min |
| August 29 | 87°F | 66°F | 28% | 18% | 13 h |
| August 30 | 87°F | 66°F | 28% | 18% | 13 h |
| August 31 | 87°F | 66°F | 28% | 18% | 13 h |
- Normal high
- 88°FAugust average
- Normal low
- 68°FAugust average
- Precipitation
- 3.63 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 11
- Daylight
- 14 h to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 29
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013891; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Knoxville in August?
On a given August day the chance of 0.01 inch or more is 32% on average, highest around August 1 (35%). In all, 3.63 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Knoxville, 11 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013891.
How humid and windy is Knoxville in August?
At 3 p.m. the normal temperature is 85°F with 50% relative humidity and a dew point of 64°F; at 6 a.m. it is 67°F with 91% humidity. The wind averages 4.5 mph, most often from the north-northwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 67°F | 65°F | 91% | 2.7 mph | 45% |
| 9 a.m. | 74°F | 66°F | 77% | 4.5 mph | 52% |
| noon | 82°F | 66°F | 58% | 5.7 mph | 45% |
| 3 p.m. | 85°F | 64°F | 50% | 6.8 mph | 41% |
| 6 p.m. | 82°F | 64°F | 54% | 6.5 mph | 46% |
| 9 p.m. | 75°F | 66°F | 73% | 4.0 mph | 55% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013891. 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 Knoxville?
The warmest August temperature on Knoxville's official record (since 1871) is 102°F, on August 29, 1948; the coldest is 49°F, on August 31, 1946. The wettest August brought 11.33 in (1920).
The August mean against the 1991-2020 normal of 77.6°F: 2021 78.8°F (+1.2), 2022 77.8°F (+0.2), 2023 77.6°F (at normal), 2024 78.1°F (+0.5), 2025 76.4°F (−1.2), 2026 79.4°F (+1.8). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 78.8°F | +1.2°F | 10.12 in |
| 2022 | 77.8°F | +0.2°F | 2.62 in |
| 2023 | 77.6°F | at normal | 6.91 in |
| 2024 | 78.1°F | +0.5°F | 4.01 in |
| 2025 | 76.4°F | −1.2°F | 4.96 in |
| 2026 | 79.4°F | +1.8°F | 5.39 in |
Source: records: ACIS, NWS threaded record TYSthr; recent months: ACIS, station USW00013891. Records and recent months use complete months only.
How does August in Knoxville 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; Knoxville's is 88°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.