Green Bay weather in August

In August, Green Bay sees average daytime highs of 78°F and overnight lows near 60°F, with 3.4 in of rain across 10.4 wet days and about 13.9 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 79°F in the first days to 76°F by the end. The sky is clear or mostly clear about 33% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 30 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Green Bay's 3rd-clearest and 12th-windiest month. For the whole year in context, see Green Bay's year-round climate.

Daytime high
78°
2nd warmest
Overnight low
60°
11th coldest
Rainfall
3.4 in
10.4 wet days
Daylight
13 h 54 min
5:00 AM – 6:52 PM
Cloud cover
56%
3rd clearest
Wind
7 mph
12th windiest
Solar energy
5.31 kWh/m²
Travel score
6.8
out of 10

Green Bay is city in and county seat of Brown County, Wisconsin, United States.

Density
727/km²
people per km²
Founded
1634

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 79°F in the first days to 76°F by the end.

A typical August day in Green Bay reaches about 78°F in the afternoon and slips back to 60°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 70°F and 86°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
18062
27962
37961
47961
57961
67961
77961
87961
97961
107860
117860
127860
137860
147860
157860
167860
177860
187860
197860
207760
217760
227759
237759
247759
257759
267759
277758
287658
297658
307658
317658

How August really feels in Green Bay

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.

Green Bay 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
Jan26° / 12°1.57.66.990.0
Feb29° / 14°1.36.45.610.10.0
Mar40° / 24°2.28.34.411.60.4
Apr53° / 35°3.111.4313.23.0
May66° / 47°3.411.40.114.65.7
Jun76° / 57°3.611.2015.36.5
Jul80° / 62°3.511.30156.4
Aug78° / 60°3.410.4013.96.8
Sep70° / 52°2.69.1012.36.7
Oct57° / 41°2.89.50.310.74.0
Nov43° / 29°2.18.22.49.40.7
Dec31° / 19°1.87.35.68.70.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35644
45644
55545
65446
75446
85446
95347
105347
115248
125248
135347
145248
155347
165248
175347
185248
195347
205347
215347
225446
235446
245446
255446
265545
275545
285644
295644
305644
315644

Chance of precipitation in August

Any precipitation

Green Bay gets around 3.4 in of rain over 10.4 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 33% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
335
435
535
634
734
834
933
1033
1133
1233
1332
1432
1532
1632
1732
1832
1933
2033
2133
2233
2333
2433
2532
2632
2732
2831
2931
3031
3130

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 27% of days. Sticky, muggy-or-worse air turns up on roughly 20% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1232628185
2232629185
3232629175
4232629175
5232629175
6232728165
7232728165
8242728165
9242727165
10242827165
11252826164
12252926164
13252926164
14262925163
15262925173
16262925173
17272924182
18272924182
19272924192
20272923192
21272923191
22272923191
23282923191
24282823191
25292823191
26302722191
27312722181
28322622181
29342522181
30352522171
31372421161

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 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
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 30 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over August. Sunrise moves from 4:43 AM to 5:18 AM, and sunset from 7:14 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.54:437:14
214.54:447:12
314.44:457:11
414.44:467:10
514.44:477:09
614.34:487:07
714.34:497:06
814.24:517:04
914.24:527:03
1014.14:537:02
1114.14:547:00
1214.14:556:59
1314.04:566:57
1414.04:586:56
1513.94:596:54
1613.95:006:52
1713.85:016:51
1813.85:026:49
1913.75:046:47
2013.75:056:46
2113.65:066:44
2213.65:076:42
2313.55:086:41
2413.55:106:39
2513.45:116:37
2613.45:126:35
2713.35:136:34
2813.35:146:32
2913.25:166:30
3013.25:176:28
3113.15:186:26

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.31 kWh/m².

For context, solar energy here swings from a low near 1.42 kWh/m² to a high of 6.32 kWh/m² in June across the year — August's 5.31 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.8Bright
45.8Bright
55.7Bright
65.7Bright
75.7Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.2Bright
195.2Bright
205.2Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Is August a good time to visit Green Bay?

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

6.8
Sightseeing
1st-best month of the year
6.3
Beach & pool
2nd-best month of the year

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

What to pack for Green Bay in August

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

In August, Green Bay sees daytime highs around 78°F and nights near 60°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Green Bay in August

The nearest coast averages about 69°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 10 mi away) is warmest in August at about 69°F and coldest in March near 34°F.

It's comfortable for a long swim from Aug 9 to Aug 23 — about 0.5 months when the water holds above 68°F.

30°40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°F)Comfort
Jan37Bracing
Feb35Bracing
Mar34Bracing
Apr37Bracing
May43Bracing
Jun52Bracing
Jul65Cool
Aug69Refreshing
Sep64Cool
Oct55Bracing
Nov46Bracing
Dec39Bracing

UV index in Green Bay in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Green Bay peaks around June 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 18UV 9Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May8Very high
Jun9Very high
Jul8Very high
Aug7High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Green Bay?

Green Bay sits at 44.5°N, 88.0°W, 591 ft above sea level, in United States. The nearest listed city is Ashwaubenon, 3.7 mi away.

Topography around Green Bay

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

Within 2 miles, the terrain around Green Bay has only modest variations in elevation — a maximum elevation change of 135 ft around an average of 597 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 433 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 728 ft.

The land around Green Bay is covered by artificial surfaces (51%) and trees (30%) within 2 miles, trees (29%) and cropland (21%) within 10 miles, and trees (30%), cropland (30%) and water (28%) within 50 miles.

2 miles
135 ft
10 miles
433 ft
50 miles
728 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Ashwaubenon 3.7 mi · Howard 3.7 mi · De Pere 5.0 mi · Bellevue 6.8 mi · Kaukauna 21 mi · Appleton 27 mi · Menasha 30 mi · Neenah 32 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 Green Bay (44.5192°, -88.0198°, elevation 591 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).