Westmont weather in July

In July, Westmont sees average daytime highs of 83°F and overnight lows near 66°F, with 3.7 in of rain across 11.4 wet days and about 14.7 hours of daylight. It is the 1st-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 83°F through the month. The sky is clear or mostly clear about 33% of the time in July, and the air most often feels muggy.

Daylight stretches from about 15 hours at the start of July to 14 h 18 min by month's end. Set against the rest of the year, July is Westmont's 3rd-clearest and 11th-windiest month. For the whole year in context, see Westmont's year-round climate.

Daytime high
83°
1st warmest
Overnight low
66°
12th coldest
Rainfall
3.7 in
11.4 wet days
Daylight
14 h 48 min
4:35 AM – 7:20 PM
Cloud cover
56%
3rd clearest
Wind
6 mph
11th windiest
Solar energy
6.34 kWh/m²
Travel score
5.8
out of 10

Westmont is village in DuPage County, Illinois, United States of America.

Density
1,887/km²
people per km²
Founded
1921

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 83°F through the month.

A typical July day in Westmont reaches about 83°F in the afternoon and slips back to 66°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 90°F. Set against its neighbours, July runs about 4°F warmer than June and about 2°F warmer than August.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18265
28265
38265
48265
58265
68365
78365
88365
98365
108366
118366
128366
138366
148366
158366
168366
178366
188366
198366
208366
218366
228366
238366
248366
258366
268366
278366
288266
298265
308265
318265

How July really feels in Westmont

Once humidity and wind are folded in, July 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

July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Westmont weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan31° / 18°2.18.35.99.30.0
Feb35° / 21°2.07.14.610.30.0
Mar47° / 30°2.710.12.911.71.4
Apr59° / 40°4.412.2113.14.2
May69° / 51°4.412.7014.35.9
Jun79° / 61°4.212.20156.2
Jul83° / 66°3.711.4014.75.8
Aug81° / 64°3.710.9013.76.5
Sep74° / 56°2.98.3012.37.1
Oct62° / 44°3.19.10.110.95.3
Nov48° / 33°2.58.31.39.61.7
Dec36° / 24°2.284.290.0

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 20% of July, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35545
45545
55545
65545
75545
85545
95545
105446
115545
125446
135446
145347
155248
165248
175149
185149
195050
205050
215050
225050
235149
245149
255149
265149
275248
285248
295347
305347
315347

Chance of precipitation in July

Any precipitation

Westmont gets around 3.7 in of rain over 11.4 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
238
338
438
538
638
738
838
938
1037
1137
1238
1338
1438
1538
1638
1738
1838
1937
2037
2137
2237
2337
2437
2537
2637
2737
2836
2936
3036
3135

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the muggy band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
118212327110
217212327110
317222327110
416222327111
516222327121
615222327121
715212427121
814212428121
913212528121
1013202529131
1112202529131
1211192529141
1311192530141
1411192530141
1510182530151
1610182530152
1710182530152
1810172430162
1910172430162
2010172430162
2110182430162
2210182330172
2310182330162
2410192330162
2510202330162
2610202329162
2710212329151
2810222329151
2910222429141
3010232428141
3110242428141

Wind in July

Winds average 6 mph in July.

Across July, 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.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 15 hours at the start of July to 14 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over July. Sunrise moves from 4:25 AM to 4:48 AM, and sunset from 7:25 PM to 7:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.04:257:25
215.04:267:25
315.04:267:25
415.04:277:25
515.04:277:25
614.94:287:24
714.94:287:24
814.94:297:24
914.94:307:24
1014.94:307:23
1114.94:317:23
1214.84:327:22
1314.84:337:22
1414.84:337:21
1514.84:347:21
1614.84:357:20
1714.74:367:20
1814.74:367:19
1914.74:377:18
2014.74:387:18
2114.64:397:17
2214.64:407:16
2314.64:417:15
2414.54:427:14
2514.54:437:13
2614.54:447:13
2714.54:457:12
2814.44:467:11
2914.44:477:10
3014.44:477:09
3114.34:487:08

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 6.34 kWh/m².

For context, solar energy here swings from a low near 1.63 kWh/m² to a high of 6.42 kWh/m² in June across the year — July's 6.34 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.5Intense
96.5Intense
106.4Intense
116.4Intense
126.4Intense
136.4Intense
146.4Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.2Intense
266.2Intense
276.1Intense
286.1Intense
296.1Intense
306.1Intense
316.0Intense
Planning a trip in July

Is July a good time to visit Westmont?

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

5.8
Sightseeing
5th-best month of the year
6.7
Beach & pool
1st-best month of the year

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

What to pack for Westmont in July

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

In July, Westmont sees daytime highs around 83°F and nights near 66°F. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

Sea temperature near Westmont in July

The nearest coast averages about 70°F in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 19 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 Westmont in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Westmont peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 22UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Westmont in July

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.

Air quality in Westmont is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 921 µg/m³Oct 2410 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar18Moderate
Apr19Moderate
May20Moderate
Jun21Moderate
Jul21Moderate
Aug18Moderate
Sep15Moderate
Oct10Good
Nov10Good
Dec11Good
Location & terrain

Where is Westmont?

Westmont sits at 41.8°N, 88.0°W, 748 ft above sea level, in United States. The nearest listed city is Hinsdale, 1.9 mi away.

Topography around Westmont

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

Within 2 miles, the terrain around Westmont has only modest variations in elevation — a maximum elevation change of 115 ft around an average of 748 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 456 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 751 ft.

The land around Westmont is covered by trees (51%) and artificial surfaces (38%) within 2 miles, trees (45%) and artificial surfaces (38%) within 10 miles, and cropland (34%) and water (22%) within 50 miles.

2 miles
115 ft
10 miles
456 ft
50 miles
751 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Hinsdale 1.9 mi · Downers Grove 1.9 mi · Darien 3.1 mi · Woodridge 5.0 mi · Lisle 5.0 mi · La Grange 5.6 mi · Lombard 6.2 mi · Westchester 6.2 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 Westmont (41.7959°, -87.9756°, elevation 748 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).