Shonai in Fall
In fall (September, October and November), Shonai sees average daytime highs around 17°C and overnight lows near 11°C, with 518 mm of precipitation over about 52 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 26°C in early September to 8°C by late November. The sky is clear or mostly clear about 18% of the time across fall, and the air most often feels dry.
Fall is Shonai's 2nd-best season to visit on our travel score. For the whole year in context, see Shonai's year-round climate.
- Avg daytime high
- 17°C
- 2nd-warmest season
- Avg overnight low
- 11°C
- Precipitation
- 518 mm
- 52 wet days
- Avg wind
- 9 km/h
- Travel score
- 4.2
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Shonai in Fall
Over the season highs ease from about 26°C in early September to 8°C by late November.
A typical fall day in Shonai reaches about 17°C and drops to 11°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Shonai
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 4 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Shonai weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 2° / -2° | 190 | 26.2 | 24.9 | 9.6 | 0.0 |
| Feb | 3° / -2° | 135 | 21.7 | 19.7 | 10.5 | 0.0 |
| Mar | 6° / 0° | 143 | 20.3 | 13.7 | 11.7 | 0.5 |
| Apr | 13° / 5° | 118 | 15.1 | 2.8 | 13 | 3.1 |
| May | 19° / 11° | 125 | 13.6 | 0 | 14.1 | 5.5 |
| Jun | 23° / 16° | 144 | 13.5 | 0 | 14.7 | 5.9 |
| Jul | 26° / 20° | 247 | 18.2 | 0 | 14.4 | 5.3 |
| Aug | 27° / 21° | 200 | 17.3 | 0 | 13.5 | 5.3 |
| Sep | 24° / 17° | 170 | 15.8 | 0 | 12.3 | 5.6 |
| Oct | 18° / 11° | 175 | 16.5 | 0 | 11 | 4.8 |
| Nov | 11° / 5° | 173 | 19.5 | 4.5 | 9.9 | 2.2 |
| Dec | 5° / 0° | 206 | 25.1 | 18.1 | 9.3 | 0.2 |
Cloud cover in Fall
The sky is clear or mostly clear about 18% of the time across fall.
Chance of precipitation in Fall
Shonai gets around 518 mm of rain and snow over 52 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 9 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 54 min in early September to 9 h 30 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 2.9 kWh/m².
Hazard calendar for Shonai
In fall, Shonai overlaps 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.
Is fall a good time to visit Shonai?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Shonai for sightseeing.
What to pack for Shonai in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Shonai sees daytime highs around 17°C and nights near 11°C. Pack a warm layer and rain gear. Worth having: light clothes. About 52 days see rain.
Sea temperature near Shonai in Fall
The nearest coast averages about 21°C across fall — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 12 | 10 | 9 | 10 | 14 | 19 | 23 | 26 | 25 | 21 | 18 | 15 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Refreshing | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 12 | Bracing |
| Feb | 10 | Bracing |
| Mar | 9 | Bracing |
| Apr | 10 | Bracing |
| May | 14 | Bracing |
| Jun | 19 | Cool |
| Jul | 23 | Refreshing |
| Aug | 26 | Warm |
| Sep | 25 | Warm |
| Oct | 21 | Refreshing |
| Nov | 18 | Cool |
| Dec | 15 | Bracing |
UV index in Shonai in Fall
Clear-sky midday UV across fall averages 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 4 | 6 | 8 | 8 | 7 | 9 | 7 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | High | Very high | Very high | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 7 | High |
| Aug | 9 | Very high |
| Sep | 7 | Very high |
| Oct | 5 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Shonai in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 13 | 19 | 21 | 20 | 15 | 13 | 11 | 10 | 10 | 10 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 13 | Moderate |
| Mar | 19 | Moderate |
| Apr | 21 | Moderate |
| May | 20 | Moderate |
| Jun | 15 | Moderate |
| Jul | 13 | Moderate |
| Aug | 11 | Good |
| Sep | 10 | Good |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
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.
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
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.