Dubuque weather in August

In August, Dubuque sees average daytime highs of 80°F and overnight lows near 63°F, with 3.8 in of rain across 9.7 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 80°F through the month. The sky is clear or mostly clear about 41% 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 h 06 min by month's end. Set against the rest of the year, August is Dubuque's 2nd-clearest and 12th-windiest month. For the whole year in context, see Dubuque's year-round climate.

Daytime high
80°
2nd warmest
Overnight low
63°
11th coldest
Rainfall
3.8 in
9.7 wet days
Daylight
13 h 42 min
5:14 AM – 6:59 PM
Cloud cover
52%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.47 kWh/m²
Travel score
6.8
out of 10

Dubuque is city in and county seat of Dubuque, Iowa, United States.

Density
719/km²
people per km²
Founded
1788

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 80°F through the month.

A typical August day in Dubuque reaches about 80°F in the afternoon and slips back to 63°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 72°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)
18164
28164
38164
48164
58164
68164
78064
88064
98063
108063
118063
128063
138063
148063
158063
168063
178063
188063
198062
207962
217962
227962
237962
247962
257962
267962
277962
287961
297961
307961
317860

How August really feels in Dubuque

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.

Dubuque 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
Jan28° / 13°1.57.469.20.0
Feb32° / 17°1.76.6510.30.0
Mar45° / 29°2.593.411.61.1
Apr58° / 40°4.211.71.113.14.0
May69° / 51°4.412.7014.45.9
Jun78° / 61°4.712015.16.4
Jul82° / 65°3.89.9014.86.5
Aug80° / 63°3.89.7013.76.8
Sep73° / 55°3.68.3012.37.1
Oct60° / 42°2.78.60.410.84.9
Nov45° / 31°2.37.529.61.1
Dec33° / 20°1.97.75.48.90.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35842
45941
55941
65842
75842
85842
95842
105743
115743
125743
135743
145842
155743
165842
175842
185941
195842
205842
215842
225842
235941
245941
255941
266040
276040
286139
296139
306139
316238

Chance of precipitation in August

Any precipitation

Dubuque gets around 3.8 in of rain over 9.7 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 31% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
230
330
431
531
631
731
831
932
1032
1132
1232
1333
1433
1533
1633
1733
1832
1932
2032
2132
2232
2332
2431
2531
2630
2729
2828
2928
3027
3127

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 27% of days. Sticky, muggy-or-worse air turns up on roughly 33% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
110252923131
210252923131
310252923121
410252923120
510252923120
610262923110
711262923110
811262923110
911262924100
1012262824100
111226282490
121227282590
131227282580
141227282580
151326282680
161326272670
171326272670
181326272770
191326272770
201425272770
211426262770
221426262770
231525252680
241526252680
251626252580
261726242580
271826242480
282025242380
292225232280
302325232180
312525231980

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
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 18 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 72 minutes over August. Sunrise moves from 4:58 AM to 5:31 AM, and sunset from 7:19 PM to 6:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:587:19
214.34:597:18
314.35:017:17
414.25:027:15
514.25:037:14
614.25:047:13
714.15:057:12
814.15:067:10
914.05:077:09
1014.05:087:08
1114.05:097:06
1213.95:107:05
1313.95:117:03
1413.85:127:02
1513.85:137:01
1613.75:146:59
1713.75:166:58
1813.75:176:56
1913.65:186:54
2013.65:196:53
2113.55:206:51
2213.55:216:50
2313.45:226:48
2413.45:236:46
2513.35:246:45
2613.35:256:43
2713.25:276:41
2813.25:286:40
2913.25:296:38
3013.15:306:36
3113.15:316:34

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.47 kWh/m².

For context, solar energy here swings from a low near 1.62 kWh/m² to a high of 6.3 kWh/m² in June across the year — August's 5.47 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Bright
35.9Bright
45.9Bright
55.9Bright
65.8Bright
75.8Bright
85.8Bright
95.7Bright
105.7Bright
115.6Bright
125.6Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.4Bright
185.4Bright
195.4Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.1Bright
295.1Bright
305.1Bright
315.0Bright
Planning a trip in August

Is August a good time to visit Dubuque?

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

6.8
Sightseeing
2nd-best month of the year
6.7
Beach & pool
2nd-best month of the year

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

What to pack for Dubuque in August

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

In August, Dubuque sees daytime highs around 80°F and nights near 63°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Dubuque 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 Dubuque peaks around June 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 18UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May7Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Dubuque 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 Dubuque is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1915 µg/m³Oct 227 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar13Moderate
Apr11Good
May12Moderate
Jun13Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov8Good
Dec9Good
Location & terrain

Where is Dubuque?

Dubuque sits at 42.5°N, 90.7°W, 620 ft above sea level, in United States. The nearest listed city is Clinton, 52 mi away.

Topography around Dubuque

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

Within 2 miles, the terrain around Dubuque has only modest variations in elevation — a maximum elevation change of 328 ft around an average of 715 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 633 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 896 ft.

The land around Dubuque is covered by artificial surfaces (36%) and trees (34%) within 2 miles, cropland (35%), trees (34%) and grassland (20%) within 10 miles, and cropland (57%) and trees (26%) within 50 miles.

2 miles
328 ft
10 miles
633 ft
50 miles
896 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Clinton 52 mi · Freeport 55 mi · Marion 58 mi · Cedar Rapids 60 mi · Davenport 68 mi · Bettendorf 68 mi · Fitchburg 68 mi · Rock Island 68 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 Dubuque (42.5006°, -90.6646°, elevation 620 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. 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).