Shiroi weather in October

In October, Shiroi sees average daytime highs of 21°C and overnight lows near 15°C, with 207 mm of rain across 12.9 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 23°C in the first days to 19°C by the end. The sky is clear or mostly clear about 33% 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 36 min by month's end. Set against the rest of the year, October is Shiroi's 6th-clearest and 9th-windiest month. For the whole year in context, see Shiroi's year-round climate.

Daytime high
21°
6th warmest
Overnight low
15°
8th coldest
Rainfall
207 mm
12.9 wet days
Daylight
11 h 06 min
5:53 AM – 4:57 PM
Cloud cover
60%
6th clearest
Wind
13 km/h
9th windiest
Solar energy
2.91 kWh/m²
Travel score
6.1
out of 10

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 19°C by the end.

A typical October day in Shiroi reaches about 21°C in the afternoon and slips back to 15°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 24°C. Set against its neighbours, October runs about 5°C cooler than September and about 5°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12418
22318
32318
42318
52318
62317
72317
82317
92217
102217
112217
122216
132216
142216
152116
162116
172115
182115
192115
202115
212014
222014
232014
242014
252014
262013
271913
281913
291913
301913
311913

How October really feels in Shiroi

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.

Shiroi 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 / 706.80.89.82.0
Feb10° / 667.91.510.62.2
Mar13° / 12012.20.711.73.4
Apr17° / 10°11411.9012.95.3
May22° / 15°13111.6013.96.2
Jun25° / 19°16113.7014.45.8
Jul28° / 23°15313.7014.25.1
Aug30° / 24°11211.8013.44.8
Sep26° / 21°17514.2012.25.7
Oct21° / 15°20712.9011.16.1
Nov16° / 10°9810.1010.15.1
Dec11° / 637.70.19.63.2

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 13% 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 (%)
13763
23862
33862
43961
54060
64060
74159
84159
94258
104357
114357
124357
134456
144555
154456
164555
174654
184753
194753
204852
214852
224951
235050
245149
255248
265347
275347
285446
295545
305644
315644

Chance of precipitation in October

Any precipitation

Shiroi gets around 207 mm of rain over 12.9 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 41% and peaks near 47% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
147
246
346
446
545
645
745
845
944
1044
1144
1243
1343
1442
1542
1641
1741
1840
1940
2040
2139
2239
2339
2438
2538
2637
2737
2836
2936
3036
3135

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 41% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1142138225
2152138214
3162138204
4172238193
5192238183
6202337172
7222436172
8242434162
9262533142
10282631131
11302829121
12322927111
13343025101
1436312391
1538312181
1640322081
1743321871
1845321661
1947321551
2049321440
2151321340
2254311230
2355311130
2457301120
2558301020
266129910
276228910
286427810
296625810
306724810
316923710

Wind in October

Winds average 13 km/h in October.

Across October, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in October

DaylightNight

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

Days shrink by about 60 minutes over October. Sunrise moves from 5:39 AM to 6:07 AM, and sunset from 5:18 PM to 4:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:395:18
211.65:405:17
311.65:415:15
411.55:425:14
511.55:435:12
611.55:445:11
711.45:455:09
811.45:455:08
911.35:465:06
1011.35:475:05
1111.35:485:04
1211.25:495:02
1311.25:505:01
1411.15:515:00
1511.15:524:58
1611.15:534:57
1711.05:534:56
1811.05:544:54
1911.05:554:53
2010.95:564:52
2110.95:574:51
2210.95:584:50
2310.85:594:48
2410.86:004:47
2510.86:014:46
2610.76:024:45
2710.76:034:44
2810.76:044:43
2910.66:054:42
3010.66:064:41
3110.66:074:40

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.91 kWh/m².

For context, solar energy here swings from a low near 2.32 kWh/m² to a high of 5.16 kWh/m² in May across the year — October's 2.91 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.2Moderate
23.1Moderate
33.1Moderate
43.1Moderate
53.1Moderate
63.0Moderate
73.0Moderate
83.0Moderate
93.0Moderate
103.0Moderate
113.0Moderate
123.0Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
242.8Moderate
252.8Moderate
262.8Moderate
272.8Moderate
282.8Moderate
292.8Moderate
302.8Moderate
312.8Moderate
Planning a trip in October

Hazard calendar for Shiroi

In seasonPeak

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

Shiroi 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 Shiroi?

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

6.1
Sightseeing
2nd-best month of the year
3.8
Beach & pool
6th-best month of the year

October is a reasonable time to visit Shiroi for sightseeing.

What to pack for Shiroi in October

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

In October, Shiroi sees daytime highs around 21°C and nights near 15°C. Worth packing: rain gear. About 13 days see rain.

rain gear

Sea temperature near Shiroi in October

The nearest coast averages about 22°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 26 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Shiroi 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 Shiroi peaks around August 10 at about 10 (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 highModerateAug 10UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Shiroi 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 Shiroi 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 Shiroi?

Shiroi sits at 35.8°N, 140.1°E, 17 m above sea level, in Japan. The nearest listed city is Kamagaya, 7.0 km away.

Topography around Shiroi

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

Within 3 km, the terrain around Shiroi has only modest variations in elevation — a maximum elevation change of 42 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 54 m; within 80 km, large variations in elevation — a maximum elevation change of 840 m.

The land around Shiroi is covered by trees (51%) and artificial surfaces (32%) within 3 km, artificial surfaces (47%), trees (24%) and cropland (20%) within 16 km, and trees (28%), artificial surfaces (27%) and water (25%) within 80 km.

3 km
42 m
16 km
54 m
80 km
840 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Kamagaya 7.0 km · Abiko 9.0 km · Yachiyo 9.0 km · Fukawa 9.0 km · Inzai 10 km · Kashiwa 11 km · Toride 11 km · Honchō 13 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 Shiroi (35.8°, 140.0667°, 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).