Greenville weather in September

In September, Greenville sees average daytime highs of 87°F and overnight lows near 68°F, with 3.0 in of rain across 6.4 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 90°F in the first days to 83°F by the end. The sky is clear or mostly clear about 55% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Greenville's 1st-clearest and 11th-windiest month. For the whole year in context, see Greenville's year-round climate.

Daytime high
87°
4th warmest
Overnight low
68°
9th coldest
Rainfall
3.0 in
6.4 wet days
Daylight
12 h 12 min
6:13 AM – 6:25 PM
Cloud cover
41%
1st clearest
Wind
7 mph
11th windiest
Solar energy
5.08 kWh/m²
Travel score
5.5
out of 10

Greenville is city in Hunt County, Texas, United States.

Density
304/km²
people per km²
Founded
1846

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 90°F in the first days to 83°F by the end.

A typical September day in Greenville reaches about 87°F in the afternoon and slips back to 68°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 94°F. Set against its neighbours, September runs about 6°F cooler than August and about 10°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19173
29072
39072
49072
59071
68971
78971
88971
98870
108870
118870
128769
138769
148769
158768
168668
178668
188667
198567
208566
218566
228566
238465
248465
258464
268464
278364
288363
298363
308262

How September really feels in Greenville

Once humidity and wind are folded in, September averages 9 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
9
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Greenville 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
Jan55° / 37°3.17.40.510.13.8
Feb59° / 40°3.380.610.84.7
Mar66° / 48°4.49.70.311.76.2
Apr74° / 55°5.19.7012.86.9
May81° / 64°5.911.6013.76.1
Jun88° / 72°3.79.4014.14.5
Jul93° / 75°2.26.70143.5
Aug93° / 75°2.05.9013.23.5
Sep87° / 68°3.06.4012.25.5
Oct76° / 57°4.17.9011.27.4
Nov65° / 47°3.67.60.110.36.4
Dec56° / 39°4.17.90.29.94.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 31%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17030
27030
37030
46832
56832
66832
76733
86733
96733
106733
116733
126733
136733
146733
156634
166733
176733
186733
196832
206931
217030
227129
237228
247228
257327
267426
277426
287426
297426
307426

Chance of precipitation in September

Any precipitation

Greenville gets around 3.0 in of rain over 6.4 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 22% and peaks near 25% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
122
223
323
424
524
625
725
825
925
1025
1125
1225
1324
1424
1524
1623
1723
1822
1922
2021
2120
2219
2318
2417
2517
2616
2716
2816
2917
3017

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 31% of days. Sticky, muggy-or-worse air turns up on roughly 52% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
148203631
259203631
369193530
4610193530
5710193429
6811183428
7911183528
81011173527
91011173527
101112163526
111212163526
121212163525
131312153524
141313153524
151413153423
161514153422
171614153321
181715163320
191815163219
202016163018
212117162917
222317162816
232518162615
242619162514
252819162413
262920162212
273120162112
283220162011
293421161910
30352116189

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 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 60 minutes over September. Sunrise moves from 6:03 AM to 6:22 AM, and sunset from 6:46 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:036:46
212.76:036:44
312.76:046:43
412.66:056:42
512.66:056:40
612.56:066:39
712.56:076:38
812.56:076:36
912.46:086:35
1012.46:096:33
1112.46:096:32
1212.36:106:30
1312.36:116:29
1412.36:116:28
1512.26:126:26
1612.26:136:25
1712.26:136:23
1812.16:146:22
1912.16:156:21
2012.16:156:19
2112.06:166:18
2212.06:176:16
2312.06:186:15
2411.96:186:13
2511.96:196:12
2611.96:206:11
2711.86:206:09
2811.86:216:08
2911.76:226:06
3011.76:226:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.08 kWh/m².

For context, solar energy here swings from a low near 2.47 kWh/m² to a high of 6.7 kWh/m² in July across the year — September's 5.08 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.4Bright
75.3Bright
85.3Bright
95.2Bright
105.2Bright
115.2Bright
125.1Bright
135.1Bright
145.1Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.7Bright
Planning a trip in September

Is September a good time to visit Greenville?

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

5.5
Sightseeing
6th-best month of the year
7.5
Beach & pool
1st-best month of the year

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

What to pack for Greenville in September

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

In September, Greenville sees daytime highs around 87°F and nights near 68°F. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Greenville in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Greenville peaks around June 21 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highVery highHighModerateJun 21UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr9Very high
May9Very high
Jun10Extreme
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Greenville 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 Greenville is worst in July — around 20 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (January, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1519 µg/m³Jan 17 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar10Good
Apr10Good
May14Moderate
Jun16Moderate
Jul20Moderate
Aug15Moderate
Sep11Good
Oct7Good
Nov7Good
Dec7Good
Location & terrain

Where is Greenville?

Greenville sits at 33.1°N, 96.1°W, 541 ft above sea level, in United States. The nearest listed city is Rockwall, 25 mi away.

Topography around Greenville

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

Within 2 miles, the terrain around Greenville has only modest variations in elevation — a maximum elevation change of 102 ft around an average of 545 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 269 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 584 ft.

The land around Greenville is covered by trees (40%), grassland (30%) and artificial surfaces (21%) within 2 miles, grassland (58%) and trees (30%) within 10 miles, and grassland (51%) and trees (28%) within 50 miles.

2 miles
102 ft
10 miles
269 ft
50 miles
584 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Rockwall 25 mi · Wylie 26 mi · Terrell 29 mi · McKinney 29 mi · Sulphur Springs 29 mi · Sachse 30 mi · Murphy 30 mi · Rowlett 31 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 Greenville (33.1384°, -96.1108°, elevation 541 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).