Iwamizawa weather in October

In October, Iwamizawa sees average daytime highs of 15°C and overnight lows near 6°C, with 92 mm of precipitation across 13.6 wet days and about 10.8 hours of daylight. It is the 6th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 12°C by the end. The sky is clear or mostly clear about 28% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of October to 10 h 06 min by month's end. Set against the rest of the year, October is Iwamizawa's 1st-clearest and 5th-windiest month. For the whole year in context, see Iwamizawa's year-round climate.

Daytime high
15°
6th warmest
Overnight low
7th coldest
Precipitation
92 mm
13.6 wet days
Daylight
10 h 48 min
5:54 AM – 4:42 PM
Cloud cover
58%
1st clearest
Wind
11 km/h
5th windiest
Solar energy
2.77 kWh/m²
Travel score
4.1
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 October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 18°C in the first days to 12°C by the end.

A typical October day in Iwamizawa reaches about 15°C in the afternoon and slips back to 6°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 18°C. Set against its neighbours, October runs about 6°C cooler than September and about 8°C warmer than November.

10°20°151015202531
Avg high (°C)Avg low (°C)
11810
2189
3189
4179
5179
6178
7178
8178
9168
10168
11167
12167
13157
14157
15156
16156
17156
18146
19146
20146
21145
22145
23135
24135
25135
26135
27124
28124
29124
30124
31124

How October really feels in Iwamizawa

Once humidity and wind are folded in, October 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

October 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 October compares with the rest of the year at a glance. October is the 6th-warmest and 4th-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 October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in October, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 24% of October, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34951
45050
55050
65050
75149
85248
95248
105347
115446
125446
135446
145545
155545
165545
175644
185644
195644
205644
215644
225545
235446
245446
255347
265347
275347
285149
295149
305149
314951

Chance of precipitation in October

Any precipitationSnow

Iwamizawa gets around 92 mm of rain and snow over 13.6 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 44% and peaks near 47% on the wettest days, and about 0 day brings snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
1460
2460
3460
4460
5460
6450
7450
8450
9440
10440
11440
12430
13430
14430
15420
16421
17421
18421
19421
20431
21431
22432
23432
24432
25443
26443
27454
28454
29465
30466
31476

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
184151
286131
387121
488111
589101
69190
79280
89370
99460
109550
119640
129640
139730
149730
159820
169820
179820
189820
199910
209910
219910
229910
239910
2410000
2510000
2610000
2710000
2810000
2910000
3010000
3110000

Wind in October

Winds average 11 km/h in October.

Across October, daily wind ranges from about 10 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2912calm
3012calm
3112calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 30 min at the start of October to 10 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over October. Sunrise moves from 5:36 AM to 6:13 AM, and sunset from 5:08 PM to 4:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.55:365:08
211.55:375:06
311.45:385:04
411.45:395:03
511.35:415:01
611.35:424:59
711.25:434:57
811.25:444:55
911.15:464:54
1011.15:474:52
1111.05:484:50
1211.05:494:48
1310.95:504:47
1410.95:524:45
1510.85:534:43
1610.85:544:42
1710.75:554:40
1810.75:574:39
1910.75:584:37
2010.65:594:35
2110.66:004:34
2210.56:024:32
2310.56:034:31
2410.46:044:29
2510.46:064:28
2610.36:074:26
2710.36:084:25
2810.26:094:24
2910.26:114:22
3010.16:124:21
3110.16:134:20

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.77 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 — October's 2.77 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.2Moderate
23.2Moderate
33.1Moderate
43.1Moderate
53.1Moderate
63.1Moderate
73.0Moderate
83.0Moderate
93.0Moderate
103.0Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.8Moderate
162.8Moderate
172.8Moderate
182.7Moderate
192.7Moderate
202.7Moderate
212.6Moderate
222.6Moderate
232.6Moderate
242.5Moderate
252.5Moderate
262.4Moderate
272.4Moderate
282.4Moderate
292.3Moderate
302.3Moderate
312.3Moderate
Planning a trip in October

Hazard calendar for Iwamizawa

In seasonPeak

In October, 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 October a good time to visit Iwamizawa?

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

4.1
Sightseeing
6th-best month of the year
0.5
Beach & pool
6th-best month of the year

October is a reasonable time to visit Iwamizawa for sightseeing.

What to pack for Iwamizawa in October

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

In October, Iwamizawa sees daytime highs around 15°C and nights near 6°C. Worth packing: a warm layer and rain gear. About 14 days see rain.

a warm layerrain gear

Sea temperature near Iwamizawa in October

The nearest coast averages about 17°C in October — 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 October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 4 — 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 October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October 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
October 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).