Shiroishi weather in October

In October, Shiroishi sees average daytime highs of 18°C and overnight lows near 10°C, with 135 mm of rain across 11.5 wet days and about 11 hours of daylight. It is the 6th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 15°C by the end. The sky is clear or mostly clear about 23% 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 24 min by month's end. Set against the rest of the year, October is Shiroishi's 4th-clearest and 8th-windiest month. For the whole year in context, see Shiroishi's year-round climate.

Daytime high
18°
6th warmest
Overnight low
10°
7th coldest
Rainfall
135 mm
11.5 wet days
Daylight
11 hours
5:53 AM – 4:52 PM
Cloud cover
65%
4th clearest
Wind
7 km/h
8th windiest
Solar energy
2.91 kWh/m²
Travel score
5.4
out of 10

Shiroishi is city in Miyagi Prefecture, Japan.

Density
116/km²
people per km²
Founded
1954

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 20°C in the first days to 15°C by the end.

A typical October day in Shiroishi reaches about 18°C in the afternoon and slips back to 10°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 21°C. Set against its neighbours, October runs about 6°C cooler than September and about 6°C warmer than November.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12013
22013
32013
42012
52012
61912
71912
81911
91911
101911
111911
121811
131810
141810
151810
161810
17179
18179
19179
20179
21179
22178
23168
24168
25168
26168
27167
28157
29157
30157
31156

How October really feels in Shiroishi

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.

Shiroishi 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 / -4°7814.5159.70.0
Feb / -4°5811.911.710.50.0
Mar / -1°9213.48.211.71.0
Apr14° / 9512.51.8133.8
May19° / 10°9812.40145.7
Jun22° / 15°12613.6014.65.8
Jul26° / 19°18818.2014.45.2
Aug27° / 20°16015.8013.55.5
Sep23° / 16°15314012.35.8
Oct18° / 10°13511.50115.4
Nov12° / 7111.629.92.9
Dec / -1°6914.510.19.40.3

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 21% of October, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13367
23367
33565
43664
53763
63862
73862
83862
94060
104060
114060
124258
134258
144357
154456
164456
174456
184555
194555
204654
214753
224753
234852
244951
254951
265149
275248
285347
295347
305446
315545

Chance of precipitation in October

Any precipitation

Shiroishi gets around 135 mm of rain over 11.5 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
241
341
440
540
639
739
838
938
1037
1136
1236
1335
1435
1534
1634
1734
1834
1934
2035
2135
2235
2336
2436
2537
2637
2737
2837
2937
3037
3137

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 79% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14736143
24936132
35135122
45235112
55534101
6583291
7593191
8622981
9642871
10682561
11702361
12742150
13761950
14801640
15821440
16831340
17861130
1888930
1989830
2091720
2192620
2293520
2395410
2496310
2596310
2696310
2797210
2897210
2998200
3098200
3198200

Wind in October

Winds average 7 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.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over October. Sunrise moves from 5:38 AM to 6:08 AM, and sunset from 5:15 PM to 4:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:385:15
211.65:395:13
311.55:405:12
411.55:415:10
511.45:425:09
611.45:435:07
711.45:445:06
811.35:455:04
911.35:465:03
1011.25:475:01
1111.25:485:00
1211.25:494:58
1311.15:504:57
1411.15:514:55
1511.05:524:54
1611.05:534:52
1711.05:544:51
1810.95:554:50
1910.95:564:48
2010.85:574:47
2110.85:584:46
2210.85:594:45
2310.76:004:43
2410.76:014:42
2510.66:024:41
2610.66:034:40
2710.66:044:38
2810.56:054:37
2910.56:064:36
3010.56:074:35
3110.46:084:34

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 2.03 kWh/m² to a high of 5.33 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
63.1Moderate
73.1Moderate
83.0Moderate
93.0Moderate
103.0Moderate
113.0Moderate
123.0Moderate
133.0Moderate
143.0Moderate
153.0Moderate
163.0Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.8Moderate
252.8Moderate
262.8Moderate
272.7Moderate
282.7Moderate
292.7Moderate
302.7Moderate
312.7Moderate
Planning a trip in October

Hazard calendar for Shiroishi

In seasonPeak

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

Shiroishi 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 Shiroishi?

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

5.4
Sightseeing
5th-best month of the year
1.6
Beach & pool
6th-best month of the year

October is a reasonable time to visit Shiroishi for sightseeing.

What to pack for Shiroishi in October

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

In October, Shiroishi sees daytime highs around 18°C and nights near 10°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Shiroishi in October

The nearest coast averages about 19°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 46 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 Shiroishi in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Shiroishi 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 Shiroishi 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 Shiroishi is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1622 µg/m³Dec 1710 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun16Moderate
Jul14Moderate
Aug12Moderate
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Shiroishi?

Shiroishi sits at 38.0°N, 140.6°E, 57 m above sea level, in Japan. The nearest listed city is Ōkawara, 11 km away.

Topography around Shiroishi

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

Within 3 km, the terrain around Shiroishi has significant variations in elevation — a maximum elevation change of 493 m around an average of 100 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,805 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,031 m.

The land around Shiroishi is covered by trees (50%), cropland (23%) and artificial surfaces (23%) within 3 km, trees (80%) within 16 km, and trees (63%) and water (20%) within 80 km.

3 km
493 m
16 km
1,805 m
80 km
2,031 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Ōkawara 11 km · Kakuda 14 km · Murata 16 km · Yanagawamachi-saiwaichō 17 km · Watari 21 km · Hobaramachi 22 km · Date 23 km · Iwanuma 24 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 Shiroishi (38.0033°, 140.6183°, elevation 57 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).