Shonai weather in October

In October, Shonai sees average daytime highs of 18°C and overnight lows near 11°C, with 175 mm of precipitation across 16.5 wet days and about 11 hours of daylight. It is the 6th-warmest and 5th-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 21% 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 Shonai's 2nd-clearest and 7th-windiest month. For the whole year in context, see Shonai's year-round climate.

Daytime high
18°
6th warmest
Overnight low
11°
8th coldest
Precipitation
175 mm
16.5 wet days
Daylight
11 hours
5:56 AM – 4:54 PM
Cloud cover
66%
2nd clearest
Wind
9 km/h
7th windiest
Solar energy
2.92 kWh/m²
Travel score
4.8
out of 10

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 Shonai reaches about 18°C in the afternoon and slips back to 11°C overnight — a 7°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)
12114
22013
32013
42013
52013
62013
71912
81912
91912
101912
111912
121811
131811
141811
151811
161811
171710
181710
191710
201710
211710
22169
23169
24169
25169
26169
27159
28158
29158
30158
31158

How October really feels in Shonai

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.

Shonai weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°19026.224.99.60.0
Feb / -2°13521.719.710.50.0
Mar / 14320.313.711.70.5
Apr13° / 11815.12.8133.1
May19° / 11°12513.6014.15.5
Jun23° / 16°14413.5014.75.9
Jul26° / 20°24718.2014.45.3
Aug27° / 21°20017.3013.55.3
Sep24° / 17°17015.8012.35.6
Oct18° / 11°17516.50114.8
Nov11° / 17319.54.59.92.2
Dec / 20625.118.19.30.2

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 18% of October, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13466
23367
33466
43466
53565
63565
73565
83565
93763
103763
113862
123961
134060
144159
154159
164159
174258
184258
194357
204258
214258
224060
234060
244060
254060
263961
273961
283961
293961
303862
313862

Chance of precipitation in October

Any precipitationSnow

Shonai gets around 175 mm of rain and snow over 16.5 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 53% and peaks near 56% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
1540
2530
3530
4530
5530
6530
7520
8520
9520
10520
11510
12510
13500
14500
15500
16500
17500
18510
19510
20510
21520
22520
23530
24540
25541
26551
27551
28551
29561
30562
31562

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 76% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14136184
24436173
34636163
44835152
55134132
65333122
75532112
85930101
9622891
10642691
11672481
12702271
13732061
14751861
15791650
16811450
17831340
18851140
19871030
2088930
2190820
2291720
2392620
2494510
2595410
2695410
2795410
2896310
2996310
3097300
3197300

Wind in October

Winds average 9 km/h in October.

Across October, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

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 5:41 AM to 6:13 AM, and sunset from 5:17 PM to 4:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:415:17
211.65:425:16
311.55:435:14
411.55:445:13
511.45:455:11
611.45:465:09
711.35:475:08
811.35:485:06
911.35:495:05
1011.25:505:03
1111.25:515:02
1211.15:525:00
1311.15:534:59
1411.05:544:57
1511.05:554:56
1611.05:564:54
1710.95:574:53
1810.95:594:52
1910.86:004:50
2010.86:014:49
2110.86:024:48
2210.76:034:46
2310.76:044:45
2410.66:054:44
2510.66:064:42
2610.66:074:41
2710.56:084:40
2810.56:094:39
2910.56:104:38
3010.46:114:36
3110.46:134:35

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.92 kWh/m².

For context, solar energy here swings from a low near 1.62 kWh/m² to a high of 5.36 kWh/m² in May across the year — October's 2.92 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.3Moderate
23.3Moderate
33.3Moderate
43.2Moderate
53.2Moderate
63.2Moderate
73.1Moderate
83.1Moderate
93.1Moderate
103.1Moderate
113.1Moderate
123.0Moderate
133.0Moderate
143.0Moderate
153.0Moderate
163.0Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.8Moderate
212.8Moderate
222.8Moderate
232.7Moderate
242.7Moderate
252.7Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.5Moderate
302.5Moderate
312.5Moderate
Planning a trip in October

Hazard calendar for Shonai

In seasonPeak

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

Shonai 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 Shonai?

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

4.8
Sightseeing
6th-best month of the year
1.5
Beach & pool
6th-best month of the year

October is a reasonable time to visit Shonai for sightseeing.

What to pack for Shonai in October

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

In October, Shonai sees daytime highs around 18°C and nights near 11°C. Pack rain gear. About 17 days see rain.

rain gear

Sea temperature near Shonai 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 24 km away) is warmest in August at about 26°C and coldest in March near 9°C.

It's comfortable for a long swim from Jun 25 to Oct 26 — about 4.1 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb10Bracing
Mar9Bracing
Apr10Bracing
May14Bracing
Jun19Cool
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct21Refreshing
Nov18Cool
Dec15Bracing

UV index in Shonai 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 Shonai peaks around August 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowAug 17UV 9Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul7High
Aug9Very high
Sep7Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Shonai 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 Shonai is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1721 µg/m³Dec 159 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun15Moderate
Jul13Moderate
Aug11Good
Sep10Good
Oct10Good
Nov10Good
Dec9Good
Location & terrain

Where is Shonai?

Shonai sits at 38.8°N, 139.9°E, 7 m above sea level, in Japan. The nearest listed city is Sakata, 9.0 km away.

Topography around Shonai

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

Within 3 km, the terrain around Shonai has only modest variations in elevation — a maximum elevation change of 14 m around an average of 8 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 776 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,205 m.

The land around Shonai is covered by cropland (77%) within 3 km, cropland (37%) and trees (36%) within 16 km, and trees (55%) and water (35%) within 80 km.

3 km
14 m
16 km
776 m
80 km
2,205 m
treesgrasslandcroplandartificial surfaceswater
October weather nearby: Sakata 9.0 km · Tsuruoka 16 km · Shinjō 36 km · Nikaho 47 km · Obanazawa 51 km · Yachi 59 km · Murayama 61 km · Yurihonjō 62 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 Shonai (38.8485°, 139.9031°, elevation 7 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).