Greenville weather in September

In September, Greenville sees average daytime highs of 86°F and overnight lows near 68°F, with 3.1 in of rain across 6.4 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 89°F in the first days to 82°F by the end. The sky is clear or mostly clear about 54% 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 2nd-clearest and 9th-windiest month. For the whole year in context, see Greenville's year-round climate.

Daytime high
86°
4th warmest
Overnight low
68°
9th coldest
Rainfall
3.1 in
6.4 wet days
Daylight
12 h 12 min
5:52 AM – 6:05 PM
Cloud cover
42%
2nd clearest
Wind
6 mph
9th windiest
Solar energy
5.12 kWh/m²
Travel score
5.7
out of 10

Greenville is city in Washington County, Mississippi, United States.

Density
449/km²
people per km²
Founded
1824

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 89°F in the first days to 82°F by the end.

A typical September day in Greenville reaches about 86°F in the afternoon and slips back to 68°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 93°F. Set against its neighbours, September runs about 5°F cooler than August and about 10°F warmer than October.

50°60°70°80°90°151015202530
Avg high (°F)Avg low (°F)
18972
28972
38972
48971
58871
68871
78871
88870
98870
108770
118769
128769
138769
148769
158668
168668
178667
188567
198567
208567
218566
228466
238465
248365
258364
268364
278264
288263
298263
308162

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 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan54° / 37°4.79.9103.3
Feb58° / 40°4.99.610.84.2
Mar66° / 48°5.311.211.76.0
Apr74° / 56°5.39.512.86.9
May82° / 65°4.710.813.76.2
Jun88° / 72°3.49.714.24.6
Jul90° / 75°3.410.9143.8
Aug91° / 74°3.18.913.23.9
Sep86° / 68°3.16.412.25.7
Oct75° / 56°4.27.611.27.4
Nov64° / 46°3.88.710.36.1
Dec56° / 39°5.29.79.83.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 54% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 32%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16535
26535
36634
46634
56634
66634
76634
86733
96733
106733
116733
126733
136733
146733
156733
166634
176634
186733
196733
206733
216832
226931
237030
247030
257129
267129
277327
287327
297327
307327

Chance of precipitation in September

Any precipitation

Greenville gets around 3.1 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.

0%10%20%30%40%151015202530
Rain chance (%)
125
225
325
424
524
623
722
822
921
1021
1121
1221
1321
1422
1522
1622
1722
1823
1923
2023
2122
2222
2322
2422
2521
2621
2721
2820
2920
3020

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 53% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1261629452
2261730442
3371830421
4371830411
5481930391
6491930371
7591930361
86102029341
96102030330
107112030320
118112029310
129122029300
1310122029290
1411122128280
1512132128270
1613132127260
1714132127250
1815132226240
1917132226220
2018132225210
2120132224200
2222132224190
2324132323170
2425142323160
2527142322150
2628142322130
2730142321120
2831152221110
2933152220100
303415222090

Wind in September

Winds average 6 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
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:42 AM to 6:02 AM, and sunset from 6:26 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:426:26
212.75:436:24
312.75:446:23
412.65:446:22
512.65:456:20
612.65:466:19
712.55:466:17
812.55:476:16
912.55:486:15
1012.45:486:13
1112.45:496:12
1212.35:506:10
1312.35:506:09
1412.35:516:08
1512.25:526:06
1612.25:526:05
1712.25:536:03
1812.15:546:02
1912.15:556:00
2012.15:555:59
2112.05:565:58
2212.05:575:56
2312.05:575:55
2411.95:585:53
2511.95:595:52
2611.85:595:50
2711.86:005:49
2811.86:015:48
2911.76:025:46
3011.76:025:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.12 kWh/m².

For context, solar energy here swings from a low near 2.32 kWh/m² to a high of 6.52 kWh/m² in June across the year — September's 5.12 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.4Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.1Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
224.9Bright
234.9Bright
244.9Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.7Bright
Planning a trip in September

Hazard calendar for Greenville

In seasonPeak

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

Greenville 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 Greenville?

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

5.7
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 86°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 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Greenville peaks around June 20 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 highHighModerateJun 20UV 10Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar7High
Apr9Very high
May9Very high
Jun10Very high
Jul9Very high
Aug9Very high
Sep8Very high
Oct5High
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 21 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (December, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1520 µg/m³Dec 186 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar10Good
Apr10Good
May14Moderate
Jun18Moderate
Jul21Moderate
Aug16Moderate
Sep12Moderate
Oct8Good
Nov7Good
Dec6Good
Location & terrain

Where is Greenville?

Greenville sits at 33.4°N, 91.1°W, 131 ft above sea level, in United States. The nearest listed city is Greenwood, 52 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 95 ft around an average of 128 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 138 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 371 ft.

The land around Greenville is covered by trees (53%) within 2 miles, cropland (45%) and trees (34%) within 10 miles, and cropland (55%) and trees (35%) within 50 miles.

2 miles
95 ft
10 miles
138 ft
50 miles
371 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Greenwood 52 mi · Clarksdale 62 mi · Vicksburg 74 mi · Pine Bluff 78 mi · Clinton 85 mi · Madison 85 mi · Ridgeland 86 mi · Monroe 88 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 (33.409°, -91.0598°, elevation 131 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).