Wildwood weather in September

In September, Wildwood sees average daytime highs of 80°F and overnight lows near 59°F, with 3.2 in of rain across 8 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 84°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 Wildwood's 1st-clearest and 10th-windiest month. For the whole year in context, see Wildwood's year-round climate.

Daytime high
80°
4th warmest
Overnight low
59°
9th coldest
Rainfall
3.2 in
8 wet days
Daylight
12 h 12 min
5:50 AM – 6:04 PM
Cloud cover
46%
1st clearest
Wind
6 mph
10th windiest
Solar energy
4.73 kWh/m²
Travel score
7.0
out of 10

Wildwood is exurban suburb of St. Louis, located in far western St. Louis County, Missouri, United States.

Density
207/km²
people per km²

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 75°F by the end.

A typical September day in Wildwood reaches about 80°F in the afternoon and slips back to 59°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 90°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18565
28465
38464
48464
58364
68363
78363
88262
98262
108262
118161
128161
138060
148060
158059
167959
177959
187958
197858
207857
217857
227757
237756
247756
257656
267655
277655
287554
297554
307554

How September really feels in Wildwood

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.

Wildwood weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 25°2.77.92.99.60.0
Feb45° / 28°2.47.62.710.51.1
Mar56° / 37°3.710.81.411.73.7
Apr67° / 47°4.511.50.2135.8
May75° / 57°4.913.2014.16.3
Jun84° / 66°3.911.1014.65.4
Jul88° / 70°3.310.3014.44.4
Aug87° / 67°3.19.5013.55.0
Sep80° / 59°3.28012.37.0
Oct68° / 48°3.48.30116.7
Nov55° / 38°3.58.40.69.93.6
Dec44° / 29°2.58.12.19.40.8

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 (%)
16436
26535
36436
46436
56436
66436
76436
86436
96337
106238
116139
126139
136040
146040
155941
165941
175941
185941
195941
205941
215941
226139
236139
246238
256337
266436
276436
286436
296535
306535

Chance of precipitation in September

Any precipitation

Wildwood gets around 3.2 in of rain over 8 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 27% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
528
628
727
827
927
1027
1128
1228
1328
1428
1528
1628
1728
1828
1928
2028
2127
2227
2326
2426
2525
2624
2724
2823
2922
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 35% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
111162529181
212162529170
314172528160
415182527150
517192526140
618202524120
720202524110
822212423100
92322242290
102522232180
112722232180
122822222070
133022222060
143222211960
153323201950
163523201940
173722191840
183822181830
194022181830
204222171720
214421161720
224621161620
234820151510
245020141510
255120141410
265419131310
275519131210
285718131200
295918121100
306117121000

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
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 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 5:36 AM to 6:03 AM, and sunset from 6:29 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:366:29
212.85:376:27
312.85:386:26
412.85:396:24
512.75:406:22
612.75:416:21
712.65:416:19
812.65:426:18
912.55:436:16
1012.55:446:14
1112.55:456:13
1212.45:466:11
1312.45:476:09
1412.35:486:08
1512.35:496:06
1612.25:506:04
1712.25:506:03
1812.25:516:01
1912.15:525:59
2012.15:535:58
2112.05:545:56
2212.05:555:54
2311.95:565:53
2411.95:575:51
2511.95:585:49
2611.85:595:48
2711.86:005:46
2811.76:015:45
2911.76:025:43
3011.66:035:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.73 kWh/m².

For context, solar energy here swings from a low near 1.94 kWh/m² to a high of 6.42 kWh/m² in June across the year — September's 4.73 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.1Bright
55.1Bright
65.0Bright
75.0Bright
85.0Bright
94.9Bright
104.9Bright
114.8Bright
124.8Bright
134.8Bright
144.7Bright
154.7Bright
164.7Bright
174.6Bright
184.6Bright
194.6Bright
204.5Bright
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 Wildwood?

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

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

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

What to pack for Wildwood in September

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

In September, Wildwood sees daytime highs around 80°F and nights near 59°F. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Wildwood 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 Wildwood peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 22UV 9Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Wildwood 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 Wildwood is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodModerateGoodJul 1517 µg/m³Nov 127 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar13Moderate
Apr10Good
May13Moderate
Jun15Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov7Good
Dec8Good
Location & terrain

Where is Wildwood?

Wildwood sits at 38.6°N, 90.7°W, 755 ft above sea level, in United States. The nearest listed city is Ballwin, 6.2 mi away.

Topography around Wildwood

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

Within 2 miles, the terrain around Wildwood has only modest variations in elevation — a maximum elevation change of 390 ft around an average of 751 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 568 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,234 ft.

The land around Wildwood is covered by trees (77%) within 2 miles, trees (69%) within 10 miles, and trees (58%) and cropland (24%) within 50 miles.

2 miles
390 ft
10 miles
568 ft
50 miles
1,234 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ballwin 6.2 mi · Chesterfield 7.5 mi · Manchester 8.1 mi · Kirkwood 14 mi · Creve Coeur 14 mi · Saint Peters 15 mi · Maryland Heights 16 mi · O'Fallon 16 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 Wildwood (38.5828°, -90.6629°, elevation 755 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).