Knoxville weather in August

In August, Knoxville sees average daytime highs of 86°F and overnight lows near 68°F, with 3.4 in of rain across 11.4 wet days and about 13.4 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 86°F through the month. The sky is clear or mostly clear about 34% of the time in August, and the air most often feels muggy.

Daylight stretches from about 13 h 48 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Knoxville's 4th-clearest and 12th-windiest month. For the whole year in context, see Knoxville's year-round climate.

Daytime high
86°
2nd warmest
Overnight low
68°
11th coldest
Rainfall
3.4 in
11.4 wet days
Daylight
13 h 24 min
5:59 AM – 7:21 PM
Cloud cover
55%
4th clearest
Wind
4 mph
12th windiest
Solar energy
5.49 kWh/m²
Travel score
4.9
out of 10

Knoxville is city and county seat of Knox County, State of Tennessee, United States.

Density
707/km²
people per km²
Founded
1786

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 86°F through the month.

A typical August day in Knoxville reaches about 86°F in the afternoon and slips back to 68°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 92°F. Set against its neighbours, August runs on par with July and about 5°F warmer than September.

60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18669
28669
38669
48669
58669
68669
78669
88669
98669
108669
118669
128669
138669
148669
158669
168669
178669
188668
198668
208668
218668
228668
238668
248568
258568
268568
278567
288567
298567
308567
318567

How August really feels in Knoxville

Once humidity and wind are folded in, August averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Knoxville weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan47° / 31°4.410.71.89.81.6
Feb52° / 34°4.310.91.710.62.6
Mar60° / 41°4.912.20.711.74.6
Apr69° / 49°4.310.9012.96.2
May77° / 58°3.711.7013.96.5
Jun84° / 66°3.713.2014.45.2
Jul86° / 70°4.714.8014.24.4
Aug86° / 68°3.411.4013.44.9
Sep81° / 62°3.58.3012.26.7
Oct70° / 50°2.97.8011.17.0
Nov59° / 40°3.88.90.210.14.7
Dec50° / 35°4.610.619.62.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 22% of August, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35347
45446
55446
65545
75545
85644
95644
105644
115644
125644
135743
145743
155644
165743
175743
185743
195743
205743
215743
225743
235743
245743
255743
265743
275743
285743
295743
305941
315941

Chance of precipitation in August

Any precipitation

Knoxville gets around 3.4 in of rain over 11.4 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 46% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
146
245
345
445
544
644
743
843
942
1042
1142
1241
1341
1440
1540
1639
1738
1837
1936
2036
2135
2234
2334
2433
2532
2632
2731
2831
2930
3030
3129

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the muggy band about 46% of days. Sticky, muggy-or-worse air turns up on roughly 73% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
114154437
214154436
314154436
415154435
515164434
615164434
715174334
816174333
916174233
1016184233
1117184133
1227184133
1327184132
1427194132
1518194131
1618204130
1718204229
1818204327
1918204426
2018204625
2118204723
2218204922
2318205021
2418205120
2518205219
2619205218
2729205316
2829205415
29210215314
30310215313
31411225112

Wind in August

Winds average 4 mph in August, the calmest month.

Across August, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 48 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over August. Sunrise moves from 5:46 AM to 6:11 AM, and sunset from 7:37 PM to 7:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:467:37
213.85:477:36
313.85:487:35
413.85:497:34
513.75:507:33
613.75:507:32
713.75:517:31
813.65:527:30
913.65:537:29
1013.65:547:28
1113.55:547:27
1213.55:557:26
1313.55:567:25
1413.45:577:23
1513.45:587:22
1613.45:597:21
1713.35:597:20
1813.36:007:19
1913.36:017:17
2013.26:027:16
2113.26:037:15
2213.26:037:13
2313.16:047:12
2413.16:057:11
2513.16:067:09
2613.06:077:08
2713.06:077:07
2812.96:087:05
2912.96:097:04
3012.96:107:02
3112.86:117:01

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.49 kWh/m².

For context, solar energy here swings from a low near 2.07 kWh/m² to a high of 6.07 kWh/m² in June across the year — August's 5.49 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in August

Is August a good time to visit Knoxville?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.9
Sightseeing
6th-best month of the year
6.7
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Knoxville for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Knoxville in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Knoxville sees daytime highs around 86°F and nights near 68°F. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Knoxville in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Knoxville peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 12UV 10Dec 19UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov4Moderate
Dec2Moderate

Air quality in Knoxville in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Knoxville is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (December, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1518 µg/m³Dec 237 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar11Good
Apr11Good
May13Moderate
Jun16Moderate
Jul18Moderate
Aug15Moderate
Sep11Good
Oct8Good
Nov9Good
Dec7Good
Location & terrain

Where is Knoxville?

Knoxville sits at 36.0°N, 83.9°W, 906 ft above sea level, in United States. The nearest listed city is Farragut, 14 mi away.

Topography around Knoxville

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Knoxville.

Within 2 miles, the terrain around Knoxville has only modest variations in elevation — a maximum elevation change of 390 ft around an average of 919 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 879 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,974 ft.

The land around Knoxville is covered by artificial surfaces (45%) and trees (39%) within 2 miles, trees (65%) and grassland (21%) within 10 miles, and trees (79%) within 50 miles.

2 miles
390 ft
10 miles
879 ft
50 miles
5,974 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Farragut 14 mi · Maryville 14 mi · Oak Ridge 20 mi · Sevierville 21 mi · Gatlinburg 29 mi · Morristown 39 mi · Greeneville 63 mi · Cleveland 77 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Knoxville (35.9606°, -83.9207°, elevation 906 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).