Gallatin weather in September

In September, Gallatin sees average daytime highs of 82°F and overnight lows near 62°F, with 3.3 in of rain across 7.9 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 85°F in the first days to 78°F by the end. The sky is clear or mostly clear about 45% of the time in September, and the air most often feels muggy.

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

Daytime high
82°
4th warmest
Overnight low
62°
9th coldest
Rainfall
3.3 in
7.9 wet days
Daylight
12 h 12 min
5:33 AM – 5:47 PM
Cloud cover
49%
2nd clearest
Wind
5 mph
9th windiest
Solar energy
4.69 kWh/m²
Travel score
6.5
out of 10

Gallatin is city in and the county seat of Sumner County, Tennessee, United States.

Density
418/km²
people per km²
Founded
1802

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 85°F in the first days to 78°F by the end.

A typical September day in Gallatin reaches about 82°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 90°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18667
28667
38567
48567
58566
68566
78465
88465
98465
108364
118364
128364
138364
148263
158263
168262
178162
188162
198161
208061
218060
228060
237960
247959
257959
267858
277858
287858
297757
307757

How September really feels in Gallatin

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.

Gallatin weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan46° / 31°4.210.61.89.81.2
Feb50° / 34°4.610.61.710.62.2
Mar60° / 41°5.011.40.711.74.5
Apr69° / 50°5.111.20.112.96.2
May77° / 60°4.912.5013.96.3
Jun85° / 68°3.912.2014.45.0
Jul88° / 71°3.912.5014.24.2
Aug87° / 70°3.210.4013.44.6
Sep82° / 62°3.37.9012.26.5
Oct71° / 51°3.77.80.111.17.1
Nov58° / 40°4.090.310.14.5
Dec49° / 34°5.010.919.62.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% 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 39%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
45941
56040
66040
76040
86040
96040
106040
116139
126139
136139
146139
156040
166040
176040
186040
196040
206040
216040
226139
236139
246238
256238
266337
276436
286436
296535
306535

Chance of precipitation in September

Any precipitation

Gallatin gets around 3.3 in of rain over 7.9 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 26% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
327
427
527
626
725
825
924
1024
1124
1223
1324
1424
1525
1625
1726
1827
1927
2028
2128
2228
2328
2428
2527
2627
2726
2826
2925
3025

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 26% of days. Sticky, muggy-or-worse air turns up on roughly 34% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1611223923
2711223822
3812233720
4912243619
51013253517
61114263416
71215273314
81315273212
91416283111
101517283010
11171728299
12181828288
13191828277
14201928277
15211927267
16231927256
17242026246
18252025236
19272125235
20292124225
21302123214
22322122204
23342221194
24362220184
25382119183
26402119173
27422118163
28442118153
29452117142
30472117142

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:21 AM to 5:45 AM, and sunset from 6:10 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:216:10
212.85:226:08
312.75:236:07
412.75:246:05
512.75:246:04
612.65:256:02
712.65:266:01
812.55:275:59
912.55:285:58
1012.55:285:56
1112.45:295:55
1212.45:305:53
1312.35:315:52
1412.35:325:50
1512.35:325:49
1612.25:335:47
1712.25:345:45
1812.15:355:44
1912.15:365:42
2012.15:375:41
2112.05:375:39
2212.05:385:38
2312.05:395:36
2411.95:405:34
2511.95:415:33
2611.85:425:31
2711.85:425:30
2811.85:435:28
2911.75:445:27
3011.75:455:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.69 kWh/m².

For context, solar energy here swings from a low near 1.96 kWh/m² to a high of 6.22 kWh/m² in June across the year — September's 4.69 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
134.8Bright
144.7Bright
154.7Bright
164.7Bright
174.6Bright
184.6Bright
194.6Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.4Bright
254.4Bright
264.4Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Is September a good time to visit Gallatin?

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
7.1
Beach & pool
1st-best month of the year

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

What to pack for Gallatin in September

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

In September, Gallatin sees daytime highs around 82°F and nights near 62°F. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Gallatin 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 Gallatin peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 11UV 9Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov4Moderate
Dec2Moderate

Air quality in Gallatin 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 Gallatin is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (November, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1518 µg/m³Nov 216 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar10Good
Apr10Good
May14Moderate
Jun16Moderate
Jul19Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov6Good
Dec7Good
Location & terrain

Where is Gallatin?

Gallatin sits at 36.4°N, 86.4°W, 538 ft above sea level, in United States. The nearest listed city is Hendersonville, 11 mi away.

Topography around Gallatin

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

Within 2 miles, the terrain around Gallatin has only modest variations in elevation — a maximum elevation change of 256 ft around an average of 548 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 771 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,919 ft.

The land around Gallatin is covered by trees (37%), grassland (34%) and artificial surfaces (21%) within 2 miles, trees (50%) and grassland (36%) within 10 miles, and trees (56%) and grassland (27%) within 50 miles.

2 miles
256 ft
10 miles
771 ft
50 miles
1,919 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hendersonville 11 mi · Mount Juliet 14 mi · Lebanon 15 mi · Goodlettsville 16 mi · Hermitage 17 mi · Nashville 24 mi · Springfield 25 mi · La Vergne 27 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 Gallatin (36.3884°, -86.4467°, elevation 538 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).