Cape Girardeau weather in September

In September, Cape Girardeau sees average daytime highs of 81°F and overnight lows near 61°F, with 3.2 in of rain across 7.6 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 85°F in the first days to 77°F by the end. The sky is clear or mostly clear about 49% of the time in September, and the air most often feels dry.

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 Cape Girardeau's 1st-clearest and 10th-windiest month. For the whole year in context, see Cape Girardeau's year-round climate.

Daytime high
81°
4th warmest
Overnight low
61°
9th coldest
Rainfall
3.2 in
7.6 wet days
Daylight
12 h 12 min
5:45 AM – 5:59 PM
Cloud cover
45%
1st clearest
Wind
6 mph
10th windiest
Solar energy
4.82 kWh/m²
Travel score
6.8
out of 10

Cape Girardeau is city in Cape Girardeau and Scott Counties in the U.S. state of Missouri.

Density
535/km²
people per km²
Founded
1793

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 77°F by the end.

A typical September day in Cape Girardeau reaches about 81°F in the afternoon and slips back to 61°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 90°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)
18667
28567
38566
48566
58566
68465
78465
88364
98364
108364
118363
128263
138262
148262
158162
168161
178061
188060
198060
208060
217959
227959
237858
247858
257857
267857
277756
287756
297656
307655

How September really feels in Cape Girardeau

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.

Cape Girardeau 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
Jan43° / 28°3.89.229.70.6
Feb48° / 31°3.48.21.710.61.8
Mar58° / 40°4.811.80.711.74.1
Apr68° / 49°5.311.1012.96.1
May77° / 60°4.712.30146.4
Jun85° / 68°3.510.1014.55.3
Jul88° / 72°3.310.1014.34.4
Aug87° / 69°2.88013.45.0
Sep81° / 61°3.27.6012.36.8
Oct69° / 50°3.97.90.1117.0
Nov56° / 39°4.18.70.5104.1
Dec46° / 31°3.78.91.39.51.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% 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 (%)
16436
26436
36436
46436
56436
66436
76337
86337
96238
106238
116238
126139
136040
146040
155941
165941
175941
185941
195941
206040
216040
226139
236238
246337
256436
266436
276535
286634
296733
306733

Chance of precipitation in September

Any precipitation

Cape Girardeau gets around 3.2 in of rain over 7.6 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 25% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
124
224
324
424
524
624
723
823
923
1023
1123
1224
1324
1425
1525
1626
1727
1827
1928
2028
2128
2228
2328
2427
2526
2625
2724
2824
2923
3022

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 29% of days. Sticky, muggy-or-worse air turns up on roughly 32% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1913203325
21014213323
31114213321
41215213220
51316213218
61417213216
71518213114
81718223113
91819223011
101919222910
11211922289
12222022278
13242022268
14252022257
15272022247
16292022236
17302022226
18321922215
19341921205
20361921204
21381920194
22401820184
23421819173
24441818163
25461818153
26481817143
27501817142
28521716132
29531716122
30541715122

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
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
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 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 5:33 AM to 5:58 AM, and sunset from 6:23 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:336:23
212.85:336:21
312.85:346:20
412.75:356:18
512.75:366:17
612.65:376:15
712.65:386:14
812.65:396:12
912.55:396:11
1012.55:406:09
1112.45:416:07
1212.45:426:06
1312.45:436:04
1412.35:446:03
1512.35:446:01
1612.25:455:59
1712.25:465:58
1812.25:475:56
1912.15:485:55
2012.15:495:53
2112.05:505:51
2212.05:505:50
2311.95:515:48
2411.95:525:47
2511.95:535:45
2611.85:545:44
2711.85:555:42
2811.75:565:40
2911.75:575:39
3011.75:585:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.82 kWh/m².

For context, solar energy here swings from a low near 1.99 kWh/m² to a high of 6.5 kWh/m² in June across the year — September's 4.82 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.2Bright
55.2Bright
65.2Bright
75.1Bright
85.1Bright
95.0Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.8Bright
174.7Bright
184.7Bright
194.7Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for Cape Girardeau

In seasonPeak

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

Cape Girardeau 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 Cape Girardeau?

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

6.8
Sightseeing
2nd-best month of the year
7.2
Beach & pool
1st-best month of the year

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

What to pack for Cape Girardeau in September

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

In September, Cape Girardeau sees daytime highs around 81°F and nights near 61°F. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Cape Girardeau 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 Cape Girardeau peaks around June 21 at about 10 (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 highHighModerateJun 21UV 10Dec 22UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun10Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov4Moderate
Dec2Moderate

Air quality in Cape Girardeau 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 Cape Girardeau is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (November, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1318 µg/m³Nov 128 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar12Moderate
Apr11Good
May14Moderate
Jun17Moderate
Jul19Moderate
Aug14Moderate
Sep12Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Cape Girardeau?

Cape Girardeau sits at 37.3°N, 89.5°W, 354 ft above sea level, in United States. The nearest listed city is Sikeston, 30 mi away.

Topography around Cape Girardeau

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

Within 2 miles, the terrain around Cape Girardeau has only modest variations in elevation — a maximum elevation change of 285 ft around an average of 371 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 869 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,375 ft.

The land around Cape Girardeau is covered by trees (36%) and cropland (20%) within 2 miles, trees (49%) and cropland (30%) within 10 miles, and trees (47%) and cropland (39%) within 50 miles.

2 miles
285 ft
10 miles
869 ft
50 miles
1,375 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sikeston 30 mi · Carbondale 34 mi · Marion 43 mi · Paducah 53 mi · Farmington 60 mi · Poplar Bluff 62 mi · Mount Vernon 78 mi · Murray 82 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 Cape Girardeau (37.3059°, -89.5182°, elevation 354 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).