Iwase weather in October

In October, Iwase sees average daytime highs of 21°C and overnight lows near 14°C, with 176 mm of rain across 12.3 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 19°C by the end. The sky is clear or mostly clear about 31% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 30 min by month's end. Set against the rest of the year, October is Iwase's 7th-clearest and 8th-windiest month. For the whole year in context, see Iwase's year-round climate.

Daytime high
21°
6th warmest
Overnight low
14°
7th coldest
Rainfall
176 mm
12.3 wet days
Daylight
11 h 06 min
5:53 AM – 4:56 PM
Cloud cover
61%
7th clearest
Wind
8 km/h
8th windiest
Solar energy
2.89 kWh/m²
Travel score
6.2
out of 10

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 19°C by the end.

A typical October day in Iwase reaches about 21°C in the afternoon and slips back to 14°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 25°C. Set against its neighbours, October runs about 6°C cooler than September and about 5°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12417
22417
32417
42316
52316
62316
72316
82316
92315
102215
112215
122215
132215
142214
152114
162114
172114
182113
192113
202113
212013
222012
232012
242012
252012
262011
271911
281911
291911
301911
311910

How October really feels in Iwase

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.

Iwase weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°556.11.39.81.9
Feb10° / 546.71.810.62.3
Mar13° / 10011.50.811.73.7
Apr18° / 10711.10.112.95.6
May23° / 14°13412.5013.96.3
Jun26° / 18°14714.6014.45.5
Jul30° / 22°16515.9014.24.4
Aug31° / 23°12313.7013.44.1
Sep27° / 20°16414.2012.25.5
Oct21° / 14°17612.3011.16.2
Nov16° / 808.7010.15.2
Dec11° / 526.50.29.63.1

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23862
33862
43961
54060
64060
74159
84159
94258
104258
114159
124258
134258
144357
154357
164357
174456
184555
194654
204753
214852
224852
234951
245149
255248
265347
275446
285545
295644
305842
315842

Chance of precipitation in October

Any precipitation

Iwase gets around 176 mm of rain over 12.3 wet days in October, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 39% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
145
245
344
444
544
643
743
843
943
1042
1142
1241
1340
1440
1539
1639
1738
1838
1938
2038
2137
2237
2337
2436
2536
2635
2735
2834
2934
3033
3133

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 51% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1192636162
2212736152
3222735141
4242834131
5262833121
6272832121
7292931111
8322929100
934292790
1037292680
1139292470
1242302270
1344302060
1447301850
1549301650
1652301440
1754291340
1856291140
1959281030
206028930
216327820
226526720
236725620
246925510
257024510
267223410
277421410
287620310
297719310
307918300
318017300

Wind in October

Winds average 8 km/h in October.

Across October, 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.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over October. Sunrise moves from 5:40 AM to 6:08 AM, and sunset from 5:18 PM to 4:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:405:18
211.65:405:16
311.65:415:15
411.55:425:13
511.55:435:12
611.45:445:10
711.45:455:09
811.45:465:07
911.35:475:06
1011.35:475:05
1111.25:485:03
1211.25:495:02
1311.25:505:00
1411.15:514:59
1511.15:524:58
1611.15:534:56
1711.05:544:55
1811.05:554:54
1910.95:564:52
2010.95:574:51
2110.95:584:50
2210.85:594:49
2310.86:004:48
2410.86:014:46
2510.76:024:45
2610.76:034:44
2710.76:044:43
2810.66:054:42
2910.66:064:41
3010.66:074:40
3110.56:084:39

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.89 kWh/m².

For context, solar energy here swings from a low near 2.38 kWh/m² to a high of 5.09 kWh/m² in May across the year — October's 2.89 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.1Moderate
33.1Moderate
43.0Moderate
53.0Moderate
63.0Moderate
73.0Moderate
83.0Moderate
93.0Moderate
103.0Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
242.9Moderate
252.9Moderate
262.8Moderate
272.8Moderate
282.8Moderate
292.8Moderate
302.8Moderate
312.8Moderate
Planning a trip in October

Hazard calendar for Iwase

In seasonPeak

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

Iwase 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 Iwase?

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

6.2
Sightseeing
2nd-best month of the year
3.9
Beach & pool
6th-best month of the year

October is a reasonable time to visit Iwase for sightseeing.

What to pack for Iwase in October

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

In October, Iwase sees daytime highs around 21°C and nights near 14°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Iwase in October

The nearest coast averages about 21°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 47 km away) is warmest in August at about 24°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 24 to Oct 28 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun19Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Iwase in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Iwase peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 17UV 9Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Iwase 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 Iwase is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2425 µg/m³Dec 1914 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar25Moderate
Apr25Moderate
May24Moderate
Jun19Moderate
Jul16Moderate
Aug15Moderate
Sep15Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Iwase?

Iwase sits at 36.4°N, 140.1°E, 49 m above sea level, in Japan. The nearest listed city is Makabe, 9.0 km away.

Topography around Iwase

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

Within 3 km, the terrain around Iwase has significant variations in elevation — a maximum elevation change of 367 m around an average of 82 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 850 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,458 m.

The land around Iwase is covered by trees (48%) and cropland (33%) within 3 km, trees (50%) and cropland (32%) within 16 km, and trees (43%), cropland (21%) and artificial surfaces (20%) within 80 km.

3 km
367 m
16 km
850 m
80 km
2,458 m
treesgrasslandcroplandartificial surfaceswater
October weather nearby: Makabe 9.0 km · Sakuragawa 11 km · Chikusei 11 km · Shimodate 12 km · Mooka 12 km · Mashiko 13 km · Kasama 15 km · Tomobe 18 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 Iwase (36.35°, 140.1°, elevation 49 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).