Shorewood weather in September

In September, Shorewood sees average daytime highs of 75°F and overnight lows near 56°F, with 2.9 in of rain across 8.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 79°F in the first days to 71°F by the end. The sky is clear or mostly clear about 43% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Shorewood's 1st-clearest and 9th-windiest month. For the whole year in context, see Shorewood's year-round climate.

Daytime high
75°
4th warmest
Overnight low
56°
9th coldest
Rainfall
2.9 in
8.1 wet days
Daylight
12 h 18 min
5:39 AM – 5:55 PM
Cloud cover
49%
1st clearest
Wind
7 mph
9th windiest
Solar energy
4.5 kWh/m²
Travel score
7.1
out of 10

Shorewood is village in Troy Township, Will County, Illinois, United States.

Founded
1830

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 79°F in the first days to 71°F by the end.

A typical September day in Shorewood reaches about 75°F in the afternoon and slips back to 56°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 65°F and 85°F. Set against its neighbours, September runs about 6°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18061
28061
37961
47960
57960
67860
77859
87859
97858
107758
117758
127757
137657
147656
157656
167556
177555
187455
197454
207454
217354
227353
237353
247252
257252
267152
277151
287151
297050
307050

How September really feels in Shorewood

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.

Shorewood weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan32° / 18°2.28.35.69.30.0
Feb36° / 21°2.07.24.410.30.0
Mar48° / 31°2.89.62.711.71.7
Apr60° / 41°4.412.40.713.14.5
May71° / 52°4.612.5014.36.1
Jun80° / 62°4.311.6014.96.3
Jul83° / 66°3.610.6014.75.8
Aug81° / 64°3.59.8013.76.6
Sep75° / 56°2.98.1012.37.1
Oct63° / 44°3.290.110.95.5
Nov48° / 33°2.78.51.29.71.9
Dec37° / 24°2.28.23.79.10.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% 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 42%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36238
46238
56238
66238
76238
86238
96238
106139
116139
126040
135941
145842
155743
165743
175644
185644
195644
205644
215644
225644
235545
245545
255545
265545
275446
285545
295545
305545

Chance of precipitation in September

Any precipitation

Shorewood gets around 2.9 in of rain over 8.1 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 28% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
329
429
528
628
728
828
928
1029
1129
1229
1329
1429
1529
1629
1729
1828
1928
2028
2127
2227
2327
2427
2527
2627
2727
2827
2927
3026

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 48% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1202625218
2212724207
3232724197
4252723186
5272823175
6292823165
7312822154
8332722154
9352721143
10372621133
11392620133
12412519132
13432419122
14452418122
15472317111
16492316111
17502216111
18532115101
19542114101
20562013101
2160191290
2261191190
2364181080
2465181070
256717970
266817960
277016860
287116850
297116850
307415740

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours 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 84 minutes over September. Sunrise moves from 5:23 AM to 5:54 AM, and sunset from 6:22 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:236:22
212.95:246:20
312.95:256:18
412.85:266:17
512.85:276:15
612.75:286:13
712.75:296:11
812.75:316:10
912.65:326:08
1012.65:336:06
1112.55:346:04
1212.55:356:03
1312.45:366:01
1412.45:375:59
1512.35:385:57
1612.35:395:55
1712.25:405:54
1812.25:415:52
1912.15:425:50
2012.15:435:48
2112.05:445:46
2212.05:455:45
2311.95:465:43
2411.95:475:41
2511.85:485:39
2611.85:505:37
2711.85:515:36
2811.75:525:34
2911.75:535:32
3011.65:545:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.5 kWh/m².

For context, solar energy here swings from a low near 1.68 kWh/m² to a high of 6.29 kWh/m² in June across the year — September's 4.5 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.8Bright
74.8Bright
84.8Bright
94.7Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.0Bright
274.0Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Shorewood?

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
5.9
Beach & pool
4th-best month of the year

September is one of the better times to visit Shorewood for general sightseeing.

What to pack for Shorewood in September

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

In September, Shorewood sees daytime highs around 75°F and nights near 56°F. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

Sea temperature near Shorewood in September

The nearest coast averages about 68°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 39 mi away) is warmest in August at about 73°F and coldest in February near 36°F.

It's comfortable for a long swim from Jul 13 to Sep 15 — about 2.1 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar36Bracing
Apr39Bracing
May45Bracing
Jun57Bracing
Jul70Refreshing
Aug73Refreshing
Sep68Refreshing
Oct58Bracing
Nov49Bracing
Dec42Bracing

UV index in Shorewood 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 Shorewood peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 20UV 9Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Shorewood 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 Shorewood is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1917 µg/m³Oct 229 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb14Moderate
Mar14Moderate
Apr13Moderate
May14Moderate
Jun15Moderate
Jul17Moderate
Aug16Moderate
Sep12Moderate
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Shorewood?

Shorewood sits at 41.5°N, 88.2°W, 577 ft above sea level, in United States. The nearest listed city is Crest Hill, 5.6 mi away.

Topography around Shorewood

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

Within 2 miles, the terrain around Shorewood has only modest variations in elevation — a maximum elevation change of 115 ft around an average of 600 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 331 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 751 ft.

The land around Shorewood is covered by artificial surfaces (29%), trees (28%) and grassland (26%) within 2 miles, cropland (36%) and grassland (23%) within 10 miles, and cropland (55%) within 50 miles.

2 miles
115 ft
10 miles
331 ft
50 miles
751 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Crest Hill 5.6 mi · Joliet 6.2 mi · Plainfield 7.5 mi · Lockport 8.7 mi · Romeoville 11 mi · New Lenox 12 mi · Oswego 14 mi · Bolingbrook 14 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 Shorewood (41.52°, -88.2017°, elevation 577 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).