Iwamizawa weather in June

In June, Iwamizawa sees average daytime highs of 20°C and overnight lows near 12°C, with 64 mm of rain across 9.6 wet days and about 15.1 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 21°C by the end. The sky is clear or mostly clear about 22% 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 12 min by month's end. Set against the rest of the year, June is Iwamizawa's 7th-clearest and 8th-windiest month. For the whole year in context, see Iwamizawa's year-round climate.

Daytime high
20°
4th warmest
Overnight low
12°
9th coldest
Rainfall
64 mm
9.6 wet days
Daylight
15 h 12 min
3:58 AM – 7:09 PM
Cloud cover
68%
7th clearest
Wind
10 km/h
8th windiest
Solar energy
5.28 kWh/m²
Travel score
6.1
out of 10

Iwamizawa is city in Hokkaido, Japan.

Density
177/km²
people per km²
Founded
1943

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 18°C in the first days to 21°C by the end.

A typical June day in Iwamizawa reaches about 20°C in the afternoon and slips back to 12°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 24°C. Set against its neighbours, June runs about 4°C warmer than May and about 4°C cooler than July.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
11810
21810
31811
41911
51911
61911
71911
81911
91911
101912
111912
121912
131912
142012
152012
162013
172013
182013
192013
202013
212013
222113
232113
242114
252114
262114
272114
282114
292214
302214

How June really feels in Iwamizawa

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.

Iwamizawa weather by month

How June compares with the rest of the year at a glance. June is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -10°4912.718.19.20.0
Feb-2° / -9°4210.714.910.20.0
Mar / -5°5711.610.511.60.1
Apr11° / 6711.83.313.12.5
May16° / 8411.40.114.44.9
Jun20° / 12°649.6015.16.1
Jul23° / 17°11311.6014.96.4
Aug24° / 18°16112.5013.86.3
Sep21° / 13°12613.2012.35.9
Oct15° / 9213.60.310.84.1
Nov / 8716.18.49.50.9
Dec / -7°6915.318.18.90.0

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in June.

Beyond those clear spells, partly cloudy skies cover about 14% of June, with mostly cloudy or overcast conditions the remaining 64%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34060
44060
54060
63961
73862
83763
93664
103565
113565
123466
133367
143466
153466
163466
173466
183466
193466
203466
213466
223466
233466
243466
253565
263565
273565
283466
293466
303466

Chance of precipitation in June

Any precipitation

Iwamizawa gets around 64 mm of rain over 9.6 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 32% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
134
233
333
433
533
633
733
833
933
1033
1133
1232
1332
1432
1532
1632
1732
1831
1931
2031
2131
2230
2330
2430
2531
2631
2731
2831
2932
3032

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 62% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
192800
291900
3891010
4881110
5861310
6851410
7821620
8801820
9782020
10752230
11732430
12712630
13682840
14663040
15633250
16603460
17583660
18553870
19533980
20514090
214842100
224643111
234443121
244244131
253944152
263744162
273544182
283344203
293144214
302943234

Wind in June

Winds average 10 km/h in June.

Across June, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in June

DaylightNight

Daylight runs from about 14 h 54 min at the start of June to 15 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over June. Sunrise moves from 4:02 AM to 4:01 AM, and sunset from 6:59 PM to 7:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.94:026:59
215.04:017:00
315.04:017:01
415.04:017:01
515.04:007:02
615.14:007:03
715.13:597:04
815.13:597:04
915.13:597:05
1015.13:597:05
1115.13:587:06
1215.13:587:07
1315.23:587:07
1415.23:587:08
1515.23:587:08
1615.23:587:09
1715.23:587:09
1815.23:587:09
1915.23:587:10
2015.23:587:10
2115.23:587:10
2215.23:587:11
2315.23:597:11
2415.23:597:11
2515.23:597:11
2615.23:597:11
2715.24:007:11
2815.24:007:11
2915.24:017:11
3015.24:017:11

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 5.28 kWh/m².

For context, solar energy here swings from a low near 1.6 kWh/m² to a high of 5.38 kWh/m² in May across the year — June's 5.28 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.4Bright
75.4Bright
85.4Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in June

Hazard calendar for Iwamizawa

In seasonPeak

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

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

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

Is June a good time to visit Iwamizawa?

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
3.1
Beach & pool
4th-best month of the year

June is a reasonable time to visit Iwamizawa for sightseeing.

What to pack for Iwamizawa in June

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

In June, Iwamizawa sees daytime highs around 20°C and nights near 12°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Iwamizawa in June

The nearest coast averages about 14°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 37 km away) is warmest in August at about 22°C and coldest in February near 5°C.

It's comfortable for a long swim from Jul 31 to Sep 22 — about 1.8 months when the water holds above 20°C.

10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan7Bracing
Feb5Bracing
Mar5Bracing
Apr7Bracing
May10Bracing
Jun14Bracing
Jul19Cool
Aug22Refreshing
Sep21Refreshing
Oct17Cool
Nov13Bracing
Dec9Bracing

UV index in Iwamizawa in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Iwamizawa peaks around August 18 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighVery highHighModerateLowAug 18UV 8Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar3Moderate
Apr6High
May7Very high
Jun7High
Jul5Moderate
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Iwamizawa 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 Iwamizawa is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1220 µg/m³Dec 159 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb15Moderate
Mar20Moderate
Apr21Moderate
May19Moderate
Jun14Moderate
Jul13Moderate
Aug11Good
Sep11Good
Oct12Good
Nov10Good
Dec9Good
Location & terrain

Where is Iwamizawa?

Iwamizawa sits at 43.2°N, 141.8°E, 17 m above sea level, in Japan. The nearest listed city is Bibai, 16 km away.

Topography around Iwamizawa

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

Within 3 km, the terrain around Iwamizawa has only modest variations in elevation — a maximum elevation change of 101 m around an average of 24 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 559 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,032 m.

The land around Iwamizawa is covered by artificial surfaces (43%) and cropland (35%) within 3 km, cropland (54%) and trees (33%) within 16 km, and trees (64%) within 80 km.

3 km
101 m
16 km
559 m
80 km
2,032 m
treesgrasslandcroplandartificial surfaceswater
June weather nearby: Bibai 16 km · Tōbetsu 20 km · Ebetsu 20 km · Kitahiroshima 29 km · Ishikari 33 km · Sunagawa 34 km · Sapporo 36 km · Eniwa 37 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 Iwamizawa (43.2003°, 141.7597°, elevation 17 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).