Morristown weather in September

In September, Morristown sees average daytime highs of 80°F and overnight lows near 61°F, with 3.1 in of rain across 8.7 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 84°F in the first days to 76°F by the end. The sky is clear or mostly clear about 41% 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 Morristown's 2nd-clearest and 9th-windiest month. For the whole year in context, see Morristown's year-round climate.

Daytime high
80°
4th warmest
Overnight low
61°
9th coldest
Rainfall
3.1 in
8.7 wet days
Daylight
12 h 12 min
6:21 AM – 6:34 PM
Cloud cover
51%
2nd clearest
Wind
4 mph
9th windiest
Solar energy
4.61 kWh/m²
Travel score
6.7
out of 10

Morristown is city in Tennessee, United States.

Density
415/km²
people per km²
Founded
1787

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 76°F by the end.

A typical September day in Morristown reaches about 80°F in the afternoon and slips back to 61°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 72°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)
18465
28465
38465
48465
58364
68364
78364
88363
98263
108263
118262
128262
138162
148162
158161
168061
178061
188060
198060
207960
217959
227859
237858
247858
257758
267757
277757
287656
297656
307655

How September really feels in Morristown

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.

Morristown weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan47° / 30°4.010.92.29.81.4
Feb51° / 33°3.911.22.410.62.3
Mar59° / 40°4.412.10.911.74.4
Apr69° / 48°3.911.1012.96.1
May76° / 57°3.712.2013.96.4
Jun83° / 65°3.313.2014.45.4
Jul86° / 69°4.115014.24.6
Aug85° / 67°3.111.2013.45.1
Sep80° / 61°3.18.7012.26.7
Oct70° / 49°2.98011.16.9
Nov58° / 39°3.49.20.210.14.5
Dec49° / 33°4.111.11.59.62.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 40%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16040
26040
36040
46040
56139
66139
76139
86238
96139
106139
116238
126139
136040
146139
156040
165941
175842
185842
195842
205743
215743
225743
235842
245842
255941
265941
276040
285941
296040
306040

Chance of precipitation in September

Any precipitation

Morristown gets around 3.1 in of rain over 8.7 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 28% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
228
328
428
528
628
727
827
927
1027
1127
1227
1327
1427
1527
1628
1728
1829
1929
2030
2130
2230
2330
2430
2529
2629
2728
2828
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 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
151527458
261628437
361728427
471829406
581929386
692129365
7102230344
8112330334
9122430313
10132530292
11142630282
12152730272
13162730261
14172830241
15182830231
16192830221
17202831211
18212831200
19222831190
20232831180
21252830170
22272730160
23292729150
24312729140
25332628130
26352627120
27372626110
28392624100
29412623100
3043252290

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 6:09 AM to 6:32 AM, and sunset from 6:57 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:096:57
212.86:096:56
312.76:106:54
412.76:116:53
512.76:126:51
612.66:136:50
712.66:136:48
812.56:146:47
912.56:156:45
1012.56:166:44
1112.46:176:42
1212.46:176:40
1312.36:186:39
1412.36:196:37
1512.36:206:36
1612.26:216:34
1712.26:226:33
1812.16:226:31
1912.16:236:30
2012.16:246:28
2112.06:256:27
2212.06:266:25
2312.06:266:23
2411.96:276:22
2511.96:286:20
2611.86:296:19
2711.86:306:17
2811.86:316:16
2911.76:316:14
3011.76:326:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.61 kWh/m².

For context, solar energy here swings from a low near 2.04 kWh/m² to a high of 6.12 kWh/m² in June across the year — September's 4.61 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
75.0Bright
84.9Bright
94.9Bright
104.9Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Morristown

In seasonPeak

In September, Morristown sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Morristown sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Morristown?

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

6.7
Sightseeing
2nd-best month of the year
6.9
Beach & pool
1st-best month of the year

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

What to pack for Morristown in September

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

In September, Morristown sees daytime highs around 80°F and nights near 61°F. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Morristown 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 Morristown peaks around July 13 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 13UV 10Dec 20UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov4Moderate
Dec2Moderate

Air quality in Morristown 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 Morristown is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (December, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1517 µg/m³Dec 226 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar10Good
Apr11Good
May13Moderate
Jun16Moderate
Jul18Moderate
Aug15Moderate
Sep11Good
Oct8Good
Nov8Good
Dec6Good
Location & terrain

Where is Morristown?

Morristown sits at 36.2°N, 83.3°W, 1,302 ft above sea level, in United States. The nearest listed city is Greeneville, 26 mi away.

Topography around Morristown

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

Within 2 miles, the terrain around Morristown has only modest variations in elevation — a maximum elevation change of 512 ft around an average of 1,355 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,056 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,886 ft.

The land around Morristown is covered by trees (48%) and grassland (32%) within 2 miles, trees (44%) and grassland (40%) within 10 miles, and trees (75%) and grassland (21%) within 50 miles.

2 miles
512 ft
10 miles
1,056 ft
50 miles
5,886 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Greeneville 26 mi · Sevierville 28 mi · Gatlinburg 37 mi · Knoxville 39 mi · Kingsport 47 mi · Maryville 49 mi · Johnson City 53 mi · Farragut 53 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 Morristown (36.214°, -83.2949°, elevation 1,302 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).