Lockport weather in August

In August, Lockport sees average daytime highs of 81°F and overnight lows near 64°F, with 3.7 in of rain across 10.2 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 81°F through the month. The sky is clear or mostly clear about 36% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 18 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Lockport's 2nd-clearest and 12th-windiest month. For the whole year in context, see Lockport's year-round climate.

Daytime high
81°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
3.7 in
10.2 wet days
Daylight
13 h 42 min
5:06 AM – 6:47 PM
Cloud cover
54%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.56 kWh/m²
Travel score
6.5
out of 10

Lockport is city in Will County, Illinois, United States.

Density
845/km²
people per km²
Founded
1853

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 81°F through the month.

A typical August day in Lockport reaches about 81°F in the afternoon and slips back to 64°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 74°F and 89°F. Set against its neighbours, August runs about 2°F cooler than July and about 6°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18265
28265
38265
48265
58265
68265
78265
88264
98264
108264
118164
128164
138164
148164
158164
168164
178164
188164
198164
208164
218163
228163
238163
248163
258163
268163
278063
288062
298062
308062
318062

How August really feels in Lockport

Once humidity and wind are folded in, August 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

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

Lockport weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan32° / 18°2.38.65.59.30.0
Feb36° / 21°2.07.14.610.30.0
Mar47° / 31°2.810.22.811.71.6
Apr60° / 41°4.412.40.713.14.4
May70° / 52°4.612.5014.36.1
Jun80° / 62°4.311.70156.3
Jul83° / 66°3.711.4014.75.7
Aug81° / 64°3.710.2013.76.5
Sep75° / 56°2.98.3012.37.1
Oct62° / 44°3.29.20.110.95.5
Nov48° / 33°2.78.61.29.71.9
Dec37° / 24°2.28.33.890.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25644
35644
45644
55644
65644
75644
85644
95644
105644
115545
125545
135545
145644
155644
165644
175644
185545
195545
205644
215545
225545
235545
245545
255644
265644
275743
285842
295842
305842
316040

Chance of precipitation in August

Any precipitation

Lockport gets around 3.7 in of rain over 10.2 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 32% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
133
233
332
432
532
632
732
832
932
1032
1132
1233
1333
1433
1533
1633
1733
1833
1933
2033
2133
2233
2333
2433
2532
2632
2731
2831
2930
3030
3130

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 26% of days. Sticky, muggy-or-worse air turns up on roughly 39% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
18242427151
28242527151
38242526151
48242526151
58252625151
68252625151
79242624151
89242624151
910242624151
1010242624151
1110242624151
1211242624151
1311242623141
1411242623141
1511242724141
1612242724131
1712232724131
1812232725131
1912232725121
2012222726121
2112222726121
2212222726121
2312222726121
2412222726121
2513232625121
2613232725111
2714232625111
2815242624110
2916242624100
3017242623100
311825252390

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, 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
16calm
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
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 18 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over August. Sunrise moves from 4:50 AM to 5:22 AM, and sunset from 7:06 PM to 6:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:507:06
214.24:517:05
314.24:527:04
414.24:537:03
514.14:547:02
614.14:557:00
714.04:566:59
814.04:576:58
914.04:586:57
1013.94:596:55
1113.95:016:54
1213.95:026:53
1313.85:036:51
1413.85:046:50
1513.75:056:48
1613.75:066:47
1713.65:076:45
1813.65:086:44
1913.65:096:42
2013.55:106:41
2113.55:116:39
2213.45:126:38
2313.45:136:36
2413.35:146:35
2513.35:156:33
2613.35:166:31
2713.25:176:30
2813.25:186:28
2913.15:196:26
3013.15:206:25
3113.05:226:23

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.56 kWh/m².

For context, solar energy here swings from a low near 1.67 kWh/m² to a high of 6.4 kWh/m² in June across the year — August's 5.56 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Bright
46.0Bright
55.9Bright
65.9Bright
75.8Bright
85.8Bright
95.8Bright
105.7Bright
115.7Bright
125.7Bright
135.6Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.4Bright
215.4Bright
225.4Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.1Bright
Planning a trip in August

Is August a good time to visit Lockport?

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

6.5
Sightseeing
2nd-best month of the year
6.8
Beach & pool
1st-best month of the year

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

What to pack for Lockport in August

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

In August, Lockport sees daytime highs around 81°F and nights near 64°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Lockport in August

The nearest coast averages about 73°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 30 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 Lockport in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Lockport 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 Lockport in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Lockport is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar15Moderate
Apr15Moderate
May17Moderate
Jun17Moderate
Jul18Moderate
Aug16Moderate
Sep12Moderate
Oct8Good
Nov9Good
Dec10Good
Location & terrain

Where is Lockport?

Lockport sits at 41.6°N, 88.1°W, 594 ft above sea level, in United States. The nearest listed city is Crest Hill, 3.1 mi away.

Topography around Lockport

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

Within 2 miles, the terrain around Lockport has only modest variations in elevation — a maximum elevation change of 305 ft around an average of 630 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 427 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 751 ft.

The land around Lockport is covered by trees (34%), grassland (31%) and artificial surfaces (24%) within 2 miles, trees (30%), grassland (26%) and artificial surfaces (25%) within 10 miles, and cropland (47%) within 50 miles.

2 miles
305 ft
10 miles
427 ft
50 miles
751 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Crest Hill 3.1 mi · Romeoville 4.3 mi · Joliet 4.3 mi · Homer Glen 6.2 mi · Lemont 6.2 mi · Goodings Grove 6.8 mi · New Lenox 7.5 mi · Bolingbrook 7.5 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 Lockport (41.5895°, -88.0578°, elevation 594 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).