Evansville weather in September

In September, Evansville sees average daytime highs of 80°F and overnight lows near 61°F, with 3.2 in of rain across 7.7 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 11th-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 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 42 min by month's end. Set against the rest of the year, September is Evansville's 1st-clearest and 10th-windiest month. For the whole year in context, see Evansville's year-round climate.

Daytime high
80°
4th warmest
Overnight low
61°
9th coldest
Rainfall
3.2 in
7.7 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
4.75 kWh/m²
Travel score
6.9
out of 10

Evansville is county seat of Vanderburgh County, Indiana, United States.

Density
968/km²
people per km²
Founded
1817

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 Evansville 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 71°F and 89°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)
18567
28567
38466
48466
58465
68365
78365
88364
98364
108264
118263
128263
138162
148162
158161
168061
178061
188060
197960
207959
217959
227858
237858
247858
257757
267757
277656
287656
297656
307655

How September really feels in Evansville

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.

Evansville 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
Jan42° / 27°3.79.12.29.70.2
Feb46° / 30°3.392.710.51.3
Mar56° / 39°4.411.61.111.73.8
Apr68° / 49°5.1120.1135.9
May76° / 59°4.8130146.3
Jun85° / 68°3.911.4014.65.3
Jul87° / 71°3.410.4014.44.7
Aug86° / 69°3.08.2013.55.2
Sep80° / 61°3.27.7012.36.9
Oct69° / 49°3.580.1116.8
Nov55° / 39°3.78.90.69.93.8
Dec45° / 31°4.010.229.41.1

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 15% of September, with mostly cloudy or overcast conditions the remaining 38%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36238
46139
56139
66139
76238
86139
96139
106139
116139
126139
136040
146040
155941
166040
175941
186040
196040
206139
216139
226139
236337
246337
256337
266436
276436
286436
296634
306634

Chance of precipitation in September

Any precipitation

Evansville gets around 3.2 in of rain over 7.7 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 26% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
225
325
425
525
625
724
824
924
1024
1124
1225
1325
1426
1526
1627
1727
1828
1928
2028
2128
2228
2328
2428
2527
2627
2726
2826
2925
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 32% of days. Sticky, muggy-or-worse air turns up on roughly 28% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11016223121
21117223020
31218213019
41319212917
51420212916
61621212814
71722212713
81922212711
92023212610
10222321259
11232321248
12252321237
13272321227
14282321226
15302321215
16322320205
17342220194
18362220184
19382119184
20402119173
21422118163
22442018153
23472017142
24481917132
25501917122
26531816112
27531816112
28551815102
2957171592
3059171491

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 54 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 72 minutes over September. Sunrise moves from 5:24 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)
112.95:246:16
212.85:256:14
312.85:266:13
412.75:276:11
512.75:286:10
612.75:296:08
712.65:296:06
812.65:306:05
912.55:316:03
1012.55:326:02
1112.45:336:00
1212.45:345:58
1312.45:355:57
1412.35:365:55
1512.35:365:53
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
2311.95:445:40
2411.95:445:39
2511.95:455:37
2611.85:465:36
2711.85:475:34
2811.75:485:32
2911.75:495:31
3011.75:505:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.75 kWh/m².

For context, solar energy here swings from a low near 1.86 kWh/m² to a high of 6.43 kWh/m² in June across the year — September's 4.75 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
105.0Bright
114.9Bright
124.9Bright
134.8Bright
144.8Bright
154.8Bright
164.7Bright
174.7Bright
184.7Bright
194.6Bright
204.6Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.4Bright
264.4Bright
274.4Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Is September a good time to visit Evansville?

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

6.9
Sightseeing
1st-best month of the year
7.0
Beach & pool
2nd-best month of the year

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

What to pack for Evansville in September

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

In September, Evansville sees daytime highs around 80°F and nights near 61°F. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

UV index in Evansville 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 Evansville peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 22UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Evansville 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 Evansville is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1419 µg/m³Oct 239 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar13Moderate
Apr12Moderate
May15Moderate
Jun18Moderate
Jul19Moderate
Aug16Moderate
Sep13Moderate
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Evansville?

Evansville sits at 38.0°N, 87.6°W, 387 ft above sea level, in United States. The nearest listed city is Henderson, 9.9 mi away.

Topography around Evansville

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

Within 2 miles, the terrain around Evansville has only modest variations in elevation — a maximum elevation change of 115 ft around an average of 384 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 302 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 853 ft.

The land around Evansville is covered by artificial surfaces (50%) and trees (30%) within 2 miles, trees (39%) and cropland (34%) within 10 miles, and cropland (53%) and trees (36%) within 50 miles.

2 miles
115 ft
10 miles
302 ft
50 miles
853 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Henderson 9.9 mi · Owensboro 28 mi · Jasper 45 mi · Madisonville 45 mi · Vincennes 48 mi · Hopkinsville 76 mi · Mount Vernon 77 mi · Marion 77 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 Evansville (37.9748°, -87.5559°, elevation 387 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).