Johnston weather in June

In June, Johnston sees average daytime highs of 80°F and overnight lows near 62°F, with 5.0 in of rain across 12.1 wet days and about 15 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 77°F in the first days to 83°F by the end. The sky is clear or mostly clear about 34% of the time in June, and the air most often feels muggy.

Daylight stretches from about 14 h 48 min at the start of June to 15 hours by month's end. Set against the rest of the year, June is Johnston's 5th-clearest and 10th-windiest month. For the whole year in context, see Johnston's year-round climate.

Daytime high
80°
3rd warmest
Overnight low
62°
10th coldest
Rainfall
5.0 in
12.1 wet days
Daylight
15 hours
4:45 AM – 7:45 PM
Cloud cover
56%
5th clearest
Wind
8 mph
10th windiest
Solar energy
6.37 kWh/m²
Travel score
6.1
out of 10

Johnston is city in Polk County, Iowa, United States.

Density
440/km²
people per km²
Founded
1969

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 77°F in the first days to 83°F by the end.

A typical June day in Johnston reaches about 80°F in the afternoon and slips back to 62°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 89°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)
17658
27758
37759
47859
57860
67860
77860
87961
97961
108061
118062
128062
138062
148062
158163
168163
178163
188163
198264
208264
218264
228264
238264
248264
258264
268265
278265
288365
298365
308365

How June really feels in Johnston

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.

Johnston weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan29° / 13°1.26.24.99.30.0
Feb34° / 17°1.46.54.810.30.0
Mar48° / 29°2.68.82.811.71.7
Apr61° / 40°4.311.1113.14.7
May71° / 52°5.513.70.114.36.0
Jun80° / 62°5.012.10156.1
Jul84° / 66°3.79.5014.75.8
Aug82° / 63°3.99.2013.76.6
Sep75° / 55°3.48.6012.37.2
Oct62° / 42°2.980.410.95.7
Nov47° / 30°2.16.51.39.61.8
Dec35° / 19°1.664.190.0

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in June.

Beyond those clear spells, partly cloudy skies cover about 17% of June, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24753
34654
44654
54753
64753
74753
84852
94852
104951
114951
124951
135050
145050
155050
165050
175149
185248
195347
205347
215446
225446
235545
245644
255644
265743
275743
285743
295842
305842

Chance of precipitation in June

Any precipitation

Johnston gets around 5.0 in of rain over 12.1 wet days in June. 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
245
345
444
544
643
743
842
942
1042
1141
1241
1341
1441
1541
1641
1741
1841
1941
2040
2140
2239
2339
2438
2538
2637
2737
2836
2936
3035

Humidity in June

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, June lands in the muggy band about 25% of days. Sticky, muggy-or-worse air turns up on roughly 32% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1442219141
2422319151
3402319161
4382419171
5362519181
6342520192
7322620202
8302620212
9282721223
10262722223
11242722234
12222723244
13212624255
14192624265
15182525266
16172426276
17162326287
18152227288
19142227298
20142127309
21132027309
221320273010
231220273111
241219273111
251119263112
261119263213
271019253214
281018253214
291018253215
30918253216

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 48 min at the start of June to 15 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over June. Sunrise moves from 4:49 AM to 4:48 AM, and sunset from 7:36 PM to 7:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.84:497:36
214.84:487:37
314.84:487:38
414.84:477:38
514.94:477:39
614.94:477:40
714.94:467:40
814.94:467:41
914.94:467:42
1014.94:457:42
1115.04:457:43
1215.04:457:43
1315.04:457:44
1415.04:457:44
1515.04:457:45
1615.04:457:45
1715.04:457:46
1815.04:457:46
1915.04:457:46
2015.04:457:47
2115.04:457:47
2215.04:457:47
2315.04:467:47
2415.04:467:47
2515.04:467:48
2615.04:477:48
2715.04:477:48
2815.04:477:48
2915.04:487:48
3015.04:487:48

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 6.37 kWh/m².

For context, solar energy here swings from a low near 1.8 kWh/m² to a high of 6.47 kWh/m² in July across the year — June's 6.37 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
26.0Intense
36.0Intense
46.1Intense
56.1Intense
66.1Intense
76.2Intense
86.2Intense
96.2Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.3Intense
156.4Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.5Intense
216.5Intense
226.5Intense
236.5Intense
246.5Intense
256.5Intense
266.5Intense
276.5Intense
286.6Intense
296.6Intense
306.6Intense
Planning a trip in June

Is June a good time to visit Johnston?

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

6.1
Sightseeing
3rd-best month of the year
6.3
Beach & pool
3rd-best month of the year

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

What to pack for Johnston in June

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

In June, Johnston sees daytime highs around 80°F and nights near 62°F. Pack sun protection. Worth having: light clothes and rain gear. About 12 days see rain.

sun protectionlight clothesrain gear

UV index in Johnston 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 Johnston peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 20UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May7High
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Johnston 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 Johnston 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 2016 µg/m³Oct 217 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb15Moderate
Mar14Moderate
Apr11Good
May11Good
Jun12Moderate
Jul16Moderate
Aug14Moderate
Sep12Good
Oct7Good
Nov9Good
Dec10Good
Location & terrain

Where is Johnston?

Johnston sits at 41.7°N, 93.7°W, 830 ft above sea level, in United States. The nearest listed city is Urbandale, 3.1 mi away.

Topography around Johnston

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

Within 2 miles, the terrain around Johnston has only modest variations in elevation — a maximum elevation change of 217 ft around an average of 846 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 305 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 787 ft.

The land around Johnston is covered by trees (40%) and grassland (26%) within 2 miles, trees (29%), cropland (25%) and grassland (22%) within 10 miles, and cropland (65%) within 50 miles.

2 miles
217 ft
10 miles
305 ft
50 miles
787 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
June weather nearby: Urbandale 3.1 mi · Clive 5.0 mi · Ankeny 6.2 mi · West Des Moines 6.8 mi · Des Moines 6.8 mi · Waukee 11 mi · Altoona 12 mi · Indianola 23 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 Johnston (41.673°, -93.6977°, elevation 830 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).