Lake Zurich weather in August

In August, Lake Zurich sees average daytime highs of 79°F and overnight lows near 66°F, with 3.6 in of rain across 10.7 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 79°F through the month. The sky is clear or mostly clear about 37% of the time in August, and the air most often feels muggy.

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 Lake Zurich's 2nd-clearest and 12th-windiest month. For the whole year in context, see Lake Zurich's year-round climate.

Daytime high
79°
2nd warmest
Overnight low
66°
11th coldest
Rainfall
3.6 in
10.7 wet days
Daylight
13 h 42 min
5:05 AM – 6:48 PM
Cloud cover
54%
2nd clearest
Wind
7 mph
12th windiest
Solar energy
5.45 kWh/m²
Travel score
6.7
out of 10

Lake Zurich is village in Lake County, Illinois, United States.

Density
1,075/km²
people per km²
Founded
1896

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 79°F through the month.

A typical August day in Lake Zurich reaches about 79°F in the afternoon and slips back to 66°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 87°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18067
28067
38067
48067
58067
68067
78067
87967
97967
107967
117966
127966
137966
147966
157966
167966
177966
187966
197866
207866
217866
227866
237865
247865
257865
267865
277865
287865
297865
307864
317764

How August really feels in Lake Zurich

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.

Lake Zurich weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan30° / 19°2.39.16.49.30.0
Feb33° / 20°2.07.25.310.30.0
Mar42° / 29°2.69.73.211.60.6
Apr53° / 40°4.412.21.213.12.9
May64° / 51°4.112.3014.45.3
Jun76° / 62°3.611.40156.5
Jul80° / 67°3.310.8014.86.4
Aug79° / 66°3.610.7013.76.7
Sep72° / 58°2.99012.36.9
Oct60° / 46°3.39.50.110.84.8
Nov46° / 35°2.68.51.49.61.4
Dec35° / 25°2.48.84.590.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35743
45743
55743
65743
75644
85644
95644
105545
115545
125545
135545
145545
155545
165644
175644
185644
195644
205644
215644
225644
235743
245644
255743
265743
275842
285842
295941
305941
316040

Chance of precipitation in August

Any precipitation

Lake Zurich gets around 3.6 in of rain over 10.7 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 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
134
234
334
434
534
634
734
834
935
1035
1135
1236
1336
1436
1536
1636
1736
1836
1936
2035
2135
2235
2334
2433
2533
2632
2731
2830
2929
3029
3128

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 27% 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 (%)
19242528141
29252527141
39252527141
49252527141
59242627141
69242627140
710242627140
810242627130
910232627130
1011232627130
1111232627130
1211232727120
1311232727120
1411232727120
1511232727120
1612232727110
1712222728110
1812222728110
1912222729110
2011222729110
2111222729110
2211222729110
2311232629110
2412232629100
2512242628100
2612242627100
2713252627100
2814252526100
2915252525100
301626252490
311726252390

Wind in August

Winds average 7 mph in August, the calmest month.

Across August, 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.

0246810151015202531
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
318light breeze

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 4:49 AM to 5:21 AM, and sunset from 7:08 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:497:08
214.34:507:07
314.24:517:06
414.24:527:04
514.24:537:03
614.14:547:02
714.14:557:01
814.14:566:59
914.04:576:58
1014.04:586:57
1113.94:596:55
1213.95:006:54
1313.95:026:53
1413.85:036:51
1513.85:046:50
1613.75:056:48
1713.75:066:47
1813.65:076:45
1913.65:086:44
2013.55:096:42
2113.55:106:40
2213.55:116:39
2313.45:126:37
2413.45:136:36
2513.35:146:34
2613.35:166:32
2713.25:176:31
2813.25:186:29
2913.15:196:27
3013.15:206:26
3113.05:216:24

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.45 kWh/m².

For context, solar energy here swings from a low near 1.56 kWh/m² to a high of 6.4 kWh/m² in June across the year — August's 5.45 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.8Bright
75.7Bright
85.7Bright
95.7Bright
105.6Bright
115.6Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.4Bright
175.4Bright
185.4Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
315.0Bright
Planning a trip in August

Is August a good time to visit Lake Zurich?

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

6.7
Sightseeing
2nd-best month of the year
6.4
Beach & pool
2nd-best month of the year

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

What to pack for Lake Zurich in August

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

In August, Lake Zurich sees daytime highs around 79°F and nights near 66°F. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Lake Zurich in August

The nearest coast averages about 71°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 17 mi away) is warmest in August at about 71°F and coldest in March near 36°F.

It's comfortable for a long swim from Jul 18 to Sep 8 — about 1.7 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar36Bracing
Apr38Bracing
May43Bracing
Jun55Bracing
Jul68Refreshing
Aug71Refreshing
Sep67Cool
Oct57Bracing
Nov47Bracing
Dec42Bracing

UV index in Lake Zurich 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 Lake Zurich peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 23UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May7Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Lake Zurich 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 Lake Zurich 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 Lake Zurich?

Lake Zurich sits at 42.2°N, 88.1°W, 876 ft above sea level, in United States. The nearest listed city is Vernon Hills, 6.2 mi away.

Topography around Lake Zurich

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

Within 2 miles, the terrain around Lake Zurich has only modest variations in elevation — a maximum elevation change of 138 ft around an average of 856 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 381 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 892 ft.

The land around Lake Zurich is covered by trees (45%), artificial surfaces (26%) and grassland (23%) within 2 miles, trees (44%) and grassland (27%) within 10 miles, and cropland (29%) and water (27%) within 50 miles.

2 miles
138 ft
10 miles
381 ft
50 miles
892 ft
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Vernon Hills 6.2 mi · Mundelein 6.2 mi · Palatine 6.8 mi · Cary 7.5 mi · Buffalo Grove 7.5 mi · Rolling Meadows 8.7 mi · Wheeling 9.3 mi · Libertyville 9.3 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 Lake Zurich (42.197°, -88.0934°, elevation 876 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).