Maryville weather in September

In September, Maryville sees average daytime highs of 81°F and overnight lows near 62°F, with 3.5 in of rain across 9.1 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 84°F in the first days to 77°F by the end. The sky is clear or mostly clear about 43% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Maryville's 2nd-clearest and 10th-windiest month. For the whole year in context, see Maryville's year-round climate.

Daytime high
81°
4th warmest
Overnight low
62°
9th coldest
Rainfall
3.5 in
9.1 wet days
Daylight
12 h 12 min
6:24 AM – 6:37 PM
Cloud cover
50%
2nd clearest
Wind
4 mph
10th windiest
Solar energy
4.59 kWh/m²
Travel score
6.5
out of 10

Maryville is city in Tennessee, USA.

Density
650/km²
people per km²
Founded
1785

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 84°F in the first days to 77°F by the end.

A typical September day in Maryville reaches about 81°F in the afternoon and slips back to 62°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 89°F. Set against its neighbours, September runs about 5°F cooler than August and about 11°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18566
28566
38565
48465
58465
68465
78464
88364
98364
108364
118363
128263
138262
148262
158162
168162
178161
188061
198061
208060
217960
227959
237859
247859
257858
267758
277757
287757
297656
307656

How September really feels in Maryville

Once humidity and wind are folded in, September 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

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

Maryville weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan48° / 32°4.511.42.19.91.8
Feb52° / 34°4.311.32.410.62.7
Mar60° / 41°4.912.21.311.74.7
Apr69° / 49°4.311.10.112.96.2
May77° / 58°3.812.3013.96.5
Jun84° / 66°3.513.1014.45.3
Jul86° / 69°3.912.7014.24.6
Aug86° / 68°3.011.6013.44.9
Sep81° / 62°3.59.1012.26.5
Oct70° / 50°3.08.30.111.17.0
Nov60° / 40°3.89.10.310.14.9
Dec51° / 35°4.611.21.29.62.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
26040
36040
46040
56040
66139
76139
86139
96139
106139
116238
126139
136040
146139
156040
165941
175842
185743
195743
205743
215743
225743
235842
245842
255941
265941
275941
285941
296040
306040

Chance of precipitation in September

Any precipitation

Maryville gets around 3.5 in of rain over 9.1 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
234
334
433
532
632
731
830
930
1029
1128
1228
1328
1428
1528
1628
1728
1829
1929
2029
2130
2230
2329
2429
2529
2628
2728
2827
2927
3027

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 29% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
151228488
251328467
361429447
471529427
581730406
681830386
791930365
8102130345
9112230325
10122330304
11132430294
12142530283
13152629273
14152729263
15162829252
16172929242
17182929232
18192929212
19202929202
20212929191
21232829181
22252729171
23272729161
24292629151
25312628141
26332527141
27352527130
28372526120
29392425110
30412424110

Wind in September

Winds average 4 mph in September.

Across September, 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.

0246810151015202530
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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 6:12 AM to 6:35 AM, and sunset from 6:59 PM to 6:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:126:59
212.86:136:58
312.76:136:56
412.76:146:55
512.66:156:54
612.66:166:52
712.66:166:51
812.56:176:49
912.56:186:48
1012.56:196:46
1112.46:206:45
1212.46:206:43
1312.36:216:41
1412.36:226:40
1512.36:236:38
1612.26:246:37
1712.26:246:35
1812.16:256:34
1912.16:266:32
2012.16:276:31
2112.06:276:29
2212.06:286:28
2312.06:296:26
2411.96:306:25
2511.96:316:23
2611.86:316:22
2711.86:326:20
2811.86:336:19
2911.76:346:17
3011.76:356:16

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.59 kWh/m².

For context, solar energy here swings from a low near 2.12 kWh/m² to a high of 6.07 kWh/m² in June across the year — September's 4.59 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.9Bright
104.8Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Is September a good time to visit Maryville?

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

6.5
Sightseeing
2nd-best month of the year
6.9
Beach & pool
1st-best month of the year

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

What to pack for Maryville in September

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

In September, Maryville sees daytime highs around 81°F and nights near 62°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Maryville in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Maryville peaks around July 11 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 11UV 10Dec 19UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov4Moderate
Dec2Moderate

Air quality in Maryville in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Maryville 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 Maryville?

Maryville sits at 35.8°N, 84.0°W, 935 ft above sea level, in United States. The nearest listed city is Farragut, 14 mi away.

Topography around Maryville

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

Within 2 miles, the terrain around Maryville has only modest variations in elevation — a maximum elevation change of 420 ft around an average of 955 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,962 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,981 ft.

The land around Maryville is covered by trees (48%), artificial surfaces (25%) and grassland (24%) within 2 miles, trees (59%) and grassland (31%) within 10 miles, and trees (80%) within 50 miles.

2 miles
420 ft
10 miles
1,962 ft
50 miles
5,981 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Farragut 14 mi · Knoxville 14 mi · Sevierville 24 mi · Oak Ridge 24 mi · Gatlinburg 26 mi · Morristown 49 mi · Cleveland 66 mi · Greeneville 70 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 Maryville (35.7565°, -83.9705°, elevation 935 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).