Waterloo weather in June

In June, Waterloo sees average daytime highs of 79°F and overnight lows near 61°F, with 5.1 in of rain across 12.4 wet days and about 15.1 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 76°F in the first days to 81°F by the end. The sky is clear or mostly clear about 31% of the time in June, and the air most often feels dry.

Daylight stretches from about 14 h 54 min at the start of June to 15 h 06 min by month's end. Set against the rest of the year, June is Waterloo's 5th-clearest and 10th-windiest month. For the whole year in context, see Waterloo's year-round climate.

Daytime high
79°
3rd warmest
Overnight low
61°
10th coldest
Rainfall
5.1 in
12.4 wet days
Daylight
15 h 06 min
4:37 AM – 7:43 PM
Cloud cover
58%
5th clearest
Wind
8 mph
10th windiest
Solar energy
6.32 kWh/m²
Travel score
6.3
out of 10

Waterloo is city in Black Hawk County, Iowa, United States.

Density
418/km²
people per km²
Founded
1868

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

Temperature in June

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 76°F in the first days to 81°F by the end.

A typical June day in Waterloo reaches about 79°F in the afternoon and slips back to 61°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 87°F. Set against its neighbours, June runs about 9°F warmer than May and about 3°F cooler than July.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17556
27557
37657
47658
57658
67758
77759
87759
97859
107860
117860
127860
137961
147961
157961
167961
177962
188062
198062
208062
218062
228062
238063
248063
258063
268063
278163
288163
298163
308163

How June really feels in Waterloo

Once humidity and wind are folded in, June 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

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

Waterloo weather by month

How June compares with the rest of the year at a glance. June is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan26° / 11°1.46.85.69.20.0
Feb31° / 15°1.46.54.810.30.0
Mar45° / 27°2.593.411.61.1
Apr59° / 39°4.311.21.113.14.3
May70° / 51°5.0130.114.46.0
Jun79° / 61°5.112.4015.16.3
Jul82° / 64°4.210.3014.86.5
Aug80° / 61°3.99.5013.76.8
Sep73° / 53°3.78.6012.37.1
Oct60° / 41°2.88.30.410.85.2
Nov45° / 29°2.17.22.19.61.2
Dec32° / 18°1.76.95.18.90.0

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in June.

Beyond those clear spells, partly cloudy skies cover about 18% of June, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24753
34753
44753
54753
64654
74654
84753
94753
104654
114654
124654
134753
144753
154753
164852
174852
184852
194951
205050
215050
225149
235149
245248
255347
265347
275446
285446
295545
305545

Chance of precipitation in June

Any precipitation

Waterloo gets around 5.1 in of rain over 12.4 wet days in June, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 46% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
146
246
345
445
544
644
743
843
942
1042
1141
1241
1341
1441
1541
1641
1741
1841
1941
2041
2140
2240
2340
2439
2539
2639
2739
2838
2938
3037

Humidity in June

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, June lands in the dry band about 28% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
152211890
2492219100
3472319110
4462319110
5442420120
6422420130
7412420141
8392520151
9372521171
10352521181
11332522191
12312522202
13292523212
14272523232
15252523243
16232524253
17222524264
18212424274
19192425275
20192325285
21182325286
22172225297
23172225297
24172125298
25162125299
261620252910
271619252910
281619252911
291518252912
301518252913

Wind in June

Winds average 8 mph in June.

Across June, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze

Sunrise & sunset in June

DaylightNight

Daylight runs from about 14 h 54 min at the start of June to 15 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over June. Sunrise moves from 4:41 AM to 4:40 AM, and sunset from 7:33 PM to 7:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.94:417:33
214.94:407:34
314.94:407:35
414.94:397:35
515.04:397:36
615.04:387:37
715.04:387:38
815.04:387:38
915.04:387:39
1015.04:377:39
1115.04:377:40
1215.14:377:41
1315.14:377:41
1415.14:377:42
1515.14:377:42
1615.14:377:43
1715.14:377:43
1815.14:377:43
1915.14:377:44
2015.14:377:44
2115.14:377:44
2215.14:377:44
2315.14:377:45
2415.14:387:45
2515.14:387:45
2615.14:387:45
2715.14:397:45
2815.14:397:45
2915.14:397:45
3015.14:407:45

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 6.32 kWh/m².

For context, solar energy here swings from a low near 1.7 kWh/m² to a high of 6.37 kWh/m² in July across the year — June's 6.32 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Intense
46.1Intense
56.1Intense
66.1Intense
76.2Intense
86.2Intense
96.2Intense
106.2Intense
116.2Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.5Intense
266.5Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
Planning a trip in June

Is June a good time to visit Waterloo?

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

6.3
Sightseeing
4th-best month of the year
6.0
Beach & pool
3rd-best month of the year

June is a reasonable time to visit Waterloo for sightseeing.

What to pack for Waterloo in June

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

In June, Waterloo sees daytime highs around 79°F and nights near 61°F. Pack sun protection. Worth having: light clothes and rain gear. About 12 days see rain.

sun protectionlight clothesrain gear

UV index in Waterloo in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Waterloo 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 18UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May7Very high
Jun9Very high
Jul8Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Waterloo in June

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Waterloo 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).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateGoodJul 1916 µg/m³Oct 217 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar14Moderate
Apr11Good
May12Good
Jun13Moderate
Jul16Moderate
Aug15Moderate
Sep12Good
Oct7Good
Nov8Good
Dec10Good
Location & terrain

Where is Waterloo?

Waterloo sits at 42.5°N, 92.3°W, 856 ft above sea level, in United States. The nearest listed city is Cedar Falls, 5.6 mi away.

Topography around Waterloo

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

Within 2 miles, the terrain around Waterloo has only modest variations in elevation — a maximum elevation change of 151 ft around an average of 873 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 243 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 620 ft.

The land around Waterloo is covered by trees (39%) and artificial surfaces (39%) within 2 miles, cropland (64%) within 10 miles, and cropland (81%) within 50 miles.

2 miles
151 ft
10 miles
243 ft
50 miles
620 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
June weather nearby: Cedar Falls 5.6 mi · Marshalltown 42 mi · Cedar Rapids 49 mi · Marion 50 mi · Mason City 63 mi · North Liberty 64 mi · Newton 66 mi · Coralville 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 Waterloo (42.4928°, -92.343°, elevation 856 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).