Clinton weather in August

In August, Clinton sees average daytime highs of 81°F and overnight lows near 63°F, with 3.6 in of rain across 9.1 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 40% 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 Clinton's 2nd-clearest and 12th-windiest month. For the whole year in context, see Clinton's year-round climate.

Daytime high
81°
2nd warmest
Overnight low
63°
11th coldest
Rainfall
3.6 in
9.1 wet days
Daylight
13 h 42 min
5:14 AM – 6:56 PM
Cloud cover
52%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.54 kWh/m²
Travel score
6.7
out of 10

Clinton is city in, and the county seat of, Clinton County, Iowa, United States.

Density
265/km²
people per km²
Founded
1836

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 Clinton reaches about 81°F in the afternoon and slips back to 63°F overnight — a 18°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)
18365
28265
38265
48265
58265
68264
78264
88264
98264
108264
118264
128164
138164
148164
158163
168163
178163
188163
198163
208163
218163
228163
238163
248163
258163
268162
278162
288162
298062
308062
318061

How August really feels in Clinton

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.

Clinton 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
Jan30° / 15°1.87.75.39.30.0
Feb34° / 19°1.96.54.310.30.0
Mar48° / 30°2.79.32.511.71.7
Apr60° / 41°4.311.80.913.14.6
May71° / 52°4.713014.36.1
Jun80° / 62°4.611.80156.2
Jul83° / 66°3.810.2014.75.9
Aug81° / 63°3.69.1013.76.7
Sep75° / 55°3.58.5012.37.1
Oct62° / 44°2.78.30.210.95.5
Nov47° / 32°2.57.71.49.61.7
Dec35° / 21°2.17.54.190.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% 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 41%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26040
36040
46040
56040
65941
75941
85941
95941
105842
115842
125941
135941
145941
155941
165941
175842
185842
195842
205842
215842
225743
235842
245842
255941
265941
275941
286040
296040
306040
316139

Chance of precipitation in August

Any precipitation

Clinton gets around 3.6 in of rain over 9.1 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 29% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
129
229
329
429
529
629
729
829
929
1029
1130
1230
1330
1429
1529
1629
1729
1829
1930
2030
2130
2230
2330
2430
2529
2629
2729
2829
2929
3029
3129

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 40% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
16222626182
26232626172
37232626172
47232626171
57232726161
67232725161
78242725151
88232725151
99232725151
109232725141
119232725141
1210232725141
1310232725131
1410232725131
1511232725131
1611232725131
1711222725131
1811222725131
1912222726131
2012212726131
2112212726131
2212222626131
2312222626130
2413222626130
2513222526130
2614232525130
2714232525130
2815232424130
2917242423120
3018242423120
3119242422110

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
247calm
257calm
267calm
277calm
287calm
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 4:58 AM to 5:30 AM, and sunset from 7:15 PM to 6:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:587:15
214.34:597:14
314.25:007:13
414.25:017:12
514.15:027:11
614.15:037:10
714.15:047:08
814.05:057:07
914.05:067:06
1013.95:077:04
1113.95:097:03
1213.95:107:02
1313.85:117:00
1413.85:126:59
1513.75:136:57
1613.75:146:56
1713.75:156:54
1813.65:166:53
1913.65:176:51
2013.55:186:50
2113.55:196:48
2213.45:206:47
2313.45:216:45
2413.45:226:44
2513.35:236:42
2613.35:246:40
2713.25:266:39
2813.25:276:37
2913.15:286:35
3013.15:296:34
3113.05:306:32

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.54 kWh/m².

For context, solar energy here swings from a low near 1.71 kWh/m² to a high of 6.36 kWh/m² in June across the year — August's 5.54 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.0Intense
36.0Intense
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
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.1Bright
315.1Bright
Planning a trip in August

Is August a good time to visit Clinton?

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
7.0
Beach & pool
1st-best month of the year

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

What to pack for Clinton in August

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

In August, Clinton sees daytime highs around 81°F and nights near 63°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Clinton 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 Clinton peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 19UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Clinton 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 Clinton is worst in July — around 15 µg/m³ PM2.5 (moderate), about 2.1× 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
May13Moderate
Jun13Moderate
Jul15Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov8Good
Dec9Good
Location & terrain

Where is Clinton?

Clinton sits at 41.8°N, 90.2°W, 587 ft above sea level, in United States. The nearest listed city is Sterling, 25 mi away.

Topography around Clinton

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

Within 2 miles, the terrain around Clinton has only modest variations in elevation — a maximum elevation change of 200 ft around an average of 620 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 367 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 817 ft.

The land around Clinton is covered by trees (32%), artificial surfaces (24%) and grassland (20%) within 2 miles, cropland (62%) within 10 miles, and cropland (73%) within 50 miles.

2 miles
200 ft
10 miles
367 ft
50 miles
817 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Sterling 25 mi · East Moline 27 mi · Bettendorf 28 mi · Moline 29 mi · Davenport 30 mi · Rock Island 30 mi · Dixon 37 mi · Freeport 43 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 Clinton (41.8445°, -90.1887°, elevation 587 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).