Iwanuma weather in June

In June, Iwanuma sees average daytime highs of 21°C and overnight lows near 16°C, with 138 mm of rain across 13.9 wet days and about 14.6 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 22°C by the end. The sky is clear or mostly clear about 14% of the time in June, and the air most often feels comfortable.

Daylight stretches from about 14 h 24 min at the start of June to 14 h 36 min by month's end. Set against the rest of the year, June is Iwanuma's 11th-clearest and 10th-windiest month. For the whole year in context, see Iwanuma's year-round climate.

Daytime high
21°
4th warmest
Overnight low
16°
9th coldest
Rainfall
138 mm
13.9 wet days
Daylight
14 h 36 min
4:18 AM – 6:56 PM
Cloud cover
76%
11th clearest
Wind
8 km/h
10th windiest
Solar energy
4.74 kWh/m²
Travel score
5.6
out of 10

Temperature in June

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 22°C by the end.

A typical June day in Iwanuma reaches about 21°C in the afternoon and slips back to 16°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 25°C. Set against its neighbours, June runs about 3°C warmer than May and about 4°C cooler than July.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12014
22014
32014
42014
52014
62014
72015
82015
92115
102115
112115
122115
132115
142116
152116
162116
172116
182116
192116
202216
212217
222217
232217
242217
252217
262217
272217
282318
292318
302318

How June really feels in Iwanuma

Once humidity and wind are folded in, June averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
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.

Iwanuma weather by month

How June compares with the rest of the year at a glance. June is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°599.26.79.70.0
Feb / -1°488.15.510.50.1
Mar / 8910.63.911.71.5
Apr14° / 10010.60.8133.8
May18° / 11°11011.70145.6
Jun21° / 16°13813.9014.65.6
Jul25° / 20°19618.1014.45.3
Aug26° / 21°17416.4013.55.5
Sep23° / 18°18114.3012.35.8
Oct18° / 12°157110115.7
Nov13° / 668.40.49.93.6
Dec / 529.549.40.9

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in June.

Beyond those clear spells, partly cloudy skies cover about 11% of June, with mostly cloudy or overcast conditions the remaining 75%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23466
33466
43268
53169
63169
73070
82971
92971
102872
112773
122575
132476
142476
152377
162377
172377
182278
192179
202179
212179
222179
232080
241981
251981
261981
271981
281981
291981
301981

Chance of precipitation in June

Any precipitation

Iwanuma gets around 138 mm of rain over 13.9 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 47% and peaks near 57% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
136
236
336
437
538
638
739
840
941
1042
1143
1245
1346
1447
1548
1649
1750
1851
1952
2052
2153
2253
2354
2454
2555
2655
2756
2856
2957
3057

Humidity in June

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, June lands in the comfortable band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
149381200
246401400
343411500
440421710
538431810
635442010
732452210
830452320
927452520
1025452720
1122453030
1220443230
1318443440
1417423650
1515413860
1614404070
1713384180
1812364390
19113444110
20103345120
2193145141
2282946161
2372746181
2472546211
2562446232
2652245252
2752144282
2841943303
2941842324
3031741354

Wind in June

Winds average 8 km/h in June.

Across June, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in June

DaylightNight

Daylight runs from about 14 h 24 min at the start of June to 14 h 36 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 4:21 AM to 4:21 AM, and sunset from 6:47 PM to 6:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.44:216:47
214.54:206:48
314.54:206:49
414.54:206:49
514.54:196:50
614.54:196:51
714.54:196:51
814.64:196:52
914.64:186:52
1014.64:186:53
1114.64:186:54
1214.64:186:54
1314.64:186:54
1414.64:186:55
1514.64:186:55
1614.64:186:56
1714.64:186:56
1814.64:186:56
1914.64:186:57
2014.64:186:57
2114.64:186:57
2214.74:196:58
2314.74:196:58
2414.64:196:58
2514.64:196:58
2614.64:206:58
2714.64:206:58
2814.64:206:58
2914.64:216:58
3014.64:216:58

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 4.74 kWh/m².

For context, solar energy here swings from a low near 2.13 kWh/m² to a high of 5.36 kWh/m² in May across the year — June's 4.74 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.1Bright
85.1Bright
95.0Bright
104.9Bright
114.9Bright
124.8Bright
134.8Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.4Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in June

Hazard calendar for Iwanuma

In seasonPeak

In June, Iwanuma sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.

Iwanuma sits in the Pacific typhoon belt; the season peaks July–October.

Iwanuma's rainy season runs March–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is June a good time to visit Iwanuma?

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

5.6
Sightseeing
3rd-best month of the year
3.5
Beach & pool
4th-best month of the year

June is a reasonable time to visit Iwanuma for sightseeing.

What to pack for Iwanuma in June

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

In June, Iwanuma sees daytime highs around 21°C and nights near 16°C. Pack rain gear. Worth having: sun protection. About 14 days see rain.

rain gearsun protection

Sea temperature near Iwanuma in June

The nearest coast averages about 18°C in June — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 23 km away) is warmest in August at about 24°C and coldest in March near 9°C.

It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan11Bracing
Feb9Bracing
Mar9Bracing
Apr10Bracing
May14Bracing
Jun18Cool
Jul21Refreshing
Aug24Refreshing
Sep23Refreshing
Oct19Cool
Nov17Cool
Dec14Bracing

UV index in Iwanuma in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June 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 Iwanuma peaks around August 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 13UV 9Jan 10UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Iwanuma 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 Iwanuma is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1621 µg/m³Dec 1710 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar20Moderate
Apr21Moderate
May20Moderate
Jun14Moderate
Jul12Good
Aug10Good
Sep10Good
Oct11Good
Nov11Good
Dec9Good
Location & terrain

Where is Iwanuma?

Iwanuma sits at 38.1°N, 140.9°E, 5 m above sea level, in Japan. The nearest listed city is Natori-shi, 7.0 km away.

Topography around Iwanuma

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Iwanuma.

Within 3 km, the terrain around Iwanuma has only modest variations in elevation — a maximum elevation change of 196 m around an average of 22 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 329 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,037 m.

The land around Iwanuma is covered by cropland (34%), artificial surfaces (33%) and trees (20%) within 3 km, trees (32%), water (25%) and cropland (21%) within 16 km, and trees (56%) and water (27%) within 80 km.

3 km
196 m
16 km
329 m
80 km
2,037 m
treesgrasslandcroplandartificial surfacesbare terrainwater
June weather nearby: Natori-shi 7.0 km · Watari 8.0 km · Murata 12 km · Ōkawara 13 km · Kakuda 16 km · Sendai 18 km · Shiroishi 24 km · Tagajō-shi 25 km

Japan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
100 V · 50 / 60 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$35,951
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.2
per 100k, 2023
Road deaths
3.6
per 100k/yr, 2019
Income group
High
World Bank
English
Very low
EF EPI 446
Religion
Shintoism 49%Buddhism 46%other 4%Christianity 1%

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 Iwanuma (38.1047°, 140.8594°, elevation 5 m), 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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. 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).