Greeneville weather in September

In September, Greeneville sees average daytime highs of 78°F and overnight lows near 58°F, with 3.4 in of rain across 9.2 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 81°F in the first days to 74°F by the end. The sky is clear or mostly clear about 40% of the time in September, and the air most often feels comfortable.

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 Greeneville's 2nd-clearest and 9th-windiest month. For the whole year in context, see Greeneville's year-round climate.

Daytime high
78°
4th warmest
Overnight low
58°
9th coldest
Rainfall
3.4 in
9.2 wet days
Daylight
12 h 12 min
6:19 AM – 6:32 PM
Cloud cover
52%
2nd clearest
Wind
4 mph
9th windiest
Solar energy
4.63 kWh/m²
Travel score
7.0
out of 10

Greeneville is town in and county seat of Greene County, Tennessee, United States.

Density
343/km²
people per km²
Founded
1783

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 81°F in the first days to 74°F by the end.

A typical September day in Greeneville reaches about 78°F in the afternoon and slips back to 58°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 70°F and 86°F. Set against its neighbours, September runs about 5°F cooler than August and about 10°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18263
28262
38162
48162
58162
68161
78061
88061
98060
108060
118060
127960
137959
147959
157859
167858
177858
187858
197757
207757
217657
227656
237656
247656
257555
267555
277455
287454
297454
307453

How September really feels in Greeneville

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.

Greeneville 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
Jan46° / 29°4.112.23.59.81.1
Feb50° / 32°3.811.83.510.62.0
Mar58° / 38°4.6132.111.74.0
Apr67° / 47°4.212.10.512.95.9
May74° / 55°4.113.4013.96.3
Jun81° / 62°3.714.8014.45.7
Jul83° / 66°4.015014.25.1
Aug83° / 65°3.412.1013.45.7
Sep78° / 58°3.49.2012.27.0
Oct68° / 47°2.98.70.211.16.6
Nov57° / 37°3.49.70.710.14.1
Dec49° / 32°4.211.42.69.61.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25941
36040
46040
56139
66139
76139
86238
96238
106238
116238
126238
136238
146139
156040
165941
175941
185842
195743
205743
215644
225644
235743
245743
255842
265842
275842
285941
295941
306040

Chance of precipitation in September

Any precipitation

Greeneville gets around 3.4 in of rain over 9.2 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 33% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
133
232
332
432
531
631
730
830
929
1029
1129
1228
1328
1428
1528
1629
1729
1829
1930
2030
2131
2231
2331
2430
2530
2630
2729
2829
2929
3028

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 19% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
181834391
281934371
392134351
4102233331
5122433311
6132532291
7142731281
8152831261
9162930241
10173130220
11193129210
12203228200
13213228190
14223327180
15233326170
16243326170
17253425160
18263425150
19283425140
20293324130
21313324130
22333224120
23353123110
24373023100
2539292290
2641292190
2744282080
2846272070
2948271970
3050261860

Wind in September

Winds average 4 mph in September.

Across September, daily wind ranges from about 3 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
13calm
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 6:07 AM to 6:30 AM, and sunset from 6:55 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:076:55
212.86:086:54
312.76:086:52
412.76:096:51
512.76:106:49
612.66:116:48
712.66:126:46
812.56:126:45
912.56:136:43
1012.56:146:42
1112.46:156:40
1212.46:166:39
1312.36:166:37
1412.36:176:36
1512.36:186:34
1612.26:196:32
1712.26:206:31
1812.16:206:29
1912.16:216:28
2012.16:226:26
2112.06:236:25
2212.06:246:23
2312.06:256:22
2411.96:256:20
2511.96:266:19
2611.86:276:17
2711.86:286:15
2811.86:296:14
2911.76:306:12
3011.76:306:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.63 kWh/m².

For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 6.12 kWh/m² in June across the year — September's 4.63 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
75.0Bright
84.9Bright
94.9Bright
104.9Bright
114.8Bright
124.8Bright
134.8Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.4Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.2Bright
304.2Bright
Planning a trip in September

Is September a good time to visit Greeneville?

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

7.0
Sightseeing
1st-best month of the year
6.4
Beach & pool
2nd-best month of the year

September is one of the better times to visit Greeneville for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Greeneville in September

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

In September, Greeneville sees daytime highs around 78°F and nights near 58°F. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Greeneville 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 Greeneville peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 12UV 10Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov4Moderate
Dec2Moderate

Air quality in Greeneville 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 Greeneville is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (December, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1618 µg/m³Dec 217 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar10Good
Apr11Good
May13Moderate
Jun16Moderate
Jul18Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec7Good
Location & terrain

Where is Greeneville?

Greeneville sits at 36.2°N, 82.8°W, 1,519 ft above sea level, in United States. The nearest listed city is Morristown, 26 mi away.

Topography around Greeneville

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

Within 2 miles, the terrain around Greeneville has only modest variations in elevation — a maximum elevation change of 390 ft around an average of 1,526 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,917 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,919 ft.

The land around Greeneville is covered by trees (44%) and grassland (41%) within 2 miles, grassland (53%) and trees (42%) within 10 miles, and trees (76%) and grassland (21%) within 50 miles.

2 miles
390 ft
10 miles
2,917 ft
50 miles
5,919 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Morristown 26 mi · Johnson City 29 mi · Kingsport 30 mi · Asheville 42 mi · Sevierville 45 mi · Bristol 47 mi · Bristol 47 mi · Gatlinburg 49 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 Greeneville (36.1632°, -82.831°, elevation 1,519 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).