Vincennes weather in September

In September, Vincennes sees average daytime highs of 79°F and overnight lows near 60°F, with 2.9 in of rain across 7.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 83°F in the first days to 75°F by the end. The sky is clear or mostly clear about 47% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Vincennes's 1st-clearest and 10th-windiest month. For the whole year in context, see Vincennes's year-round climate.

Daytime high
79°
4th warmest
Overnight low
60°
9th coldest
Rainfall
2.9 in
7.4 wet days
Daylight
12 h 12 min
5:37 AM – 5:52 PM
Cloud cover
46%
1st clearest
Wind
6 mph
10th windiest
Solar energy
4.74 kWh/m²
Travel score
7.1
out of 10

Vincennes is county seat of Knox County, Indiana, United States.

Density
930/km²
people per km²
Founded
1732

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 83°F in the first days to 75°F by the end.

A typical September day in Vincennes reaches about 79°F in the afternoon and slips back to 60°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 88°F. Set against its neighbours, September runs about 6°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18465
28465
38365
48364
58364
68363
78263
88263
98262
108162
118161
128161
138060
148060
158060
167959
177959
187958
197858
207858
217857
227757
237756
247656
257656
267655
277655
287555
297554
307454

How September really feels in Vincennes

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.

Vincennes weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 25°3.69.12.89.60.0
Feb44° / 28°3.08.4310.50.7
Mar54° / 37°4.110.61.311.73.3
Apr66° / 47°5.2120135.7
May75° / 58°5.112.9014.16.3
Jun84° / 67°4.111.2014.75.5
Jul86° / 70°3.811014.44.9
Aug85° / 67°2.98.6013.55.5
Sep79° / 60°2.97.4012.37.1
Oct67° / 48°3.280116.6
Nov54° / 37°3.88.80.69.93.3
Dec43° / 29°3.49.62.59.30.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 37%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16337
26337
36337
46337
56337
66436
76436
86436
96436
106436
116436
126238
136238
146139
156238
166139
176139
186139
196139
206238
216238
226238
236337
246436
256436
266436
276436
286535
296535
306535

Chance of precipitation in September

Any precipitation

Vincennes gets around 2.9 in of rain over 7.4 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 25% and peaks near 26% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
225
325
425
524
624
724
823
923
1023
1123
1223
1323
1423
1524
1624
1725
1825
1926
2026
2126
2226
2326
2426
2526
2626
2725
2825
2924
3024

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 24% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11320203017
21420203016
31621202914
41721202813
51922202711
62122212610
7222321259
8242321258
9262321247
10282321236
11292321225
12312321215
13332321204
14352220194
15362220184
16382219173
17402219163
18422218163
19442117152
20462116142
21482116142
22502015132
23522014122
24541914121
25561913111
26581813101
27581813101
2861171291
2962161291
3063161281

Wind in September

Winds average 6 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
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:23 AM to 5:50 AM, and sunset from 6:16 PM to 5:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:236:16
212.85:246:15
312.85:256:13
412.85:266:12
512.75:276:10
612.75:286:08
712.65:296:07
812.65:306:05
912.55:316:03
1012.55:326:02
1112.55:326:00
1212.45:335:58
1312.45:345:57
1412.35:355:55
1512.35:365:54
1612.25:375:52
1712.25:385:50
1812.25:395:49
1912.15:405:47
2012.15:415:45
2112.05:425:44
2212.05:435:42
2311.95:435:40
2411.95:445:39
2511.95:455:37
2611.85:465:35
2711.85:475:34
2811.75:485:32
2911.75:495:30
3011.65:505:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.74 kWh/m².

For context, solar energy here swings from a low near 1.81 kWh/m² to a high of 6.43 kWh/m² in June across the year — September's 4.74 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.2Bright
35.2Bright
45.2Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
104.9Bright
114.9Bright
124.8Bright
134.8Bright
144.8Bright
154.7Bright
164.7Bright
174.7Bright
184.6Bright
194.6Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.4Bright
254.4Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.2Bright
Planning a trip in September

Hazard calendar for Vincennes

In seasonPeak

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

Vincennes 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 Vincennes?

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

7.1
Sightseeing
1st-best month of the year
7.0
Beach & pool
2nd-best month of the year

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

What to pack for Vincennes in September

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

In September, Vincennes sees daytime highs around 79°F and nights near 60°F. Worth packing: light clothes and sun protection. About 7 days see rain.

light clothessun protection

UV index in Vincennes in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Vincennes peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 23UV 9Dec 22UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Vincennes 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 Vincennes is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1417 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar12Good
Apr11Good
May14Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Vincennes?

Vincennes sits at 38.7°N, 87.5°W, 420 ft above sea level, in United States. The nearest listed city is Jasper, 38 mi away.

Topography around Vincennes

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

Within 2 miles, the terrain around Vincennes has only modest variations in elevation — a maximum elevation change of 194 ft around an average of 430 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 279 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 594 ft.

The land around Vincennes is covered by trees (27%), cropland (26%) and artificial surfaces (24%) within 2 miles, cropland (70%) and trees (20%) within 10 miles, and cropland (57%) and trees (34%) within 50 miles.

2 miles
194 ft
10 miles
279 ft
50 miles
594 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Jasper 38 mi · Evansville 48 mi · Terre Haute 55 mi · Henderson 58 mi · Bloomington 63 mi · Owensboro 66 mi · Charleston 66 mi · Mattoon 71 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 Vincennes (38.6773°, -87.5286°, elevation 420 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).