Sōsa in Fall
In fall (September, October and November), Sōsa sees average daytime highs around 21°C and overnight lows near 16°C, with 486 mm of rain over about 38 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 28°C in early September to 14°C by late November. The sky is clear or mostly clear about 31% of the time across fall, and the air most often feels dry.
Fall is Sōsa's best season of the year to visit on our travel score. For the whole year in context, see Sōsa's year-round climate.
- Avg daytime high
- 21°C
- 2nd-warmest season
- Avg overnight low
- 16°C
- Rainfall
- 486 mm
- 38 wet days
- Avg wind
- 13 km/h
- Travel score
- 5.7
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in Sōsa in Fall
Over the season highs ease from about 28°C in early September to 14°C by late November.
A typical fall day in Sōsa reaches about 21°C and drops to 16°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Sōsa
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
fall sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Sōsa 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 | 9° / 3° | 82 | 8.7 | 0.7 | 9.9 | 2.1 |
| Feb | 10° / 4° | 77 | 9 | 0.8 | 10.6 | 2.3 |
| Mar | 13° / 7° | 130 | 13.1 | 0.5 | 11.7 | 3.4 |
| Apr | 17° / 11° | 112 | 12.6 | 0 | 12.9 | 5.2 |
| May | 21° / 16° | 128 | 11.7 | 0 | 13.9 | 6.1 |
| Jun | 24° / 19° | 159 | 13.2 | 0 | 14.4 | 5.9 |
| Jul | 28° / 23° | 142 | 13.3 | 0 | 14.2 | 5.4 |
| Aug | 29° / 24° | 101 | 11.1 | 0 | 13.4 | 5.1 |
| Sep | 26° / 22° | 168 | 14 | 0 | 12.2 | 5.8 |
| Oct | 21° / 17° | 209 | 13.2 | 0 | 11.1 | 6.1 |
| Nov | 17° / 11° | 109 | 10.9 | 0 | 10.1 | 5.2 |
| Dec | 12° / 6° | 77 | 9.4 | 0 | 9.6 | 3.3 |
Cloud cover in Fall
The sky is clear or mostly clear about 31% of the time across fall.
Chance of precipitation in Fall
Sōsa gets around 486 mm of rain over 38 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 13 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 48 min in early September to 9 h 48 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 3.2 kWh/m².
Hazard calendar for Sōsa
In fall, Sōsa overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Sōsa sits in the Pacific typhoon belt; the season peaks July–October.
Is fall a good time to visit Sōsa?
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 Sōsa for sightseeing.
What to pack for Sōsa in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Sōsa sees daytime highs around 21°C and nights near 16°C. Pack rain gear. Worth having: light clothes and a warm layer. About 38 days see rain.
Sea temperature near Sōsa in Fall
The nearest coast averages about 23°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 25°C and coldest in February near 15°C.
It's comfortable for a long swim from Jun 5 to Nov 22 — about 5.6 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 16 | 15 | 15 | 16 | 19 | 21 | 23 | 25 | 25 | 23 | 21 | 18 |
| Comfort | Cool | Bracing | Cool | Cool | Cool | Refreshing | Refreshing | Warm | Warm | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 16 | Cool |
| Feb | 15 | Bracing |
| Mar | 15 | Cool |
| Apr | 16 | Cool |
| May | 19 | Cool |
| Jun | 21 | Refreshing |
| Jul | 23 | Refreshing |
| Aug | 25 | Warm |
| Sep | 25 | Warm |
| Oct | 23 | Refreshing |
| Nov | 21 | Refreshing |
| Dec | 18 | Cool |
UV index in Sōsa in Fall
Clear-sky midday UV across fall averages 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 Sōsa peaks around August 12 at about 10 (extreme) — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 4 | 7 | 8 | 9 | 10 | 10 | 8 | 6 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 10 | Very high |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Air quality in Sōsa 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 Sōsa 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 15 | 18 | 25 | 25 | 24 | 19 | 16 | 15 | 15 | 16 | 16 | 14 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 18 | Moderate |
| Mar | 25 | Moderate |
| Apr | 25 | Moderate |
| May | 24 | Moderate |
| Jun | 19 | Moderate |
| Jul | 16 | Moderate |
| Aug | 15 | Moderate |
| Sep | 15 | Moderate |
| Oct | 16 | Moderate |
| Nov | 16 | Moderate |
| Dec | 14 | Moderate |
Where is Sōsa?
Sōsa sits at 35.7°N, 140.6°E, 36 m above sea level, in Japan. The nearest listed city is Yōkaichiba, 2.0 km away.
Topography around Sōsa
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sōsa.
Within 3 km, the terrain around Sōsa has only modest variations in elevation — a maximum elevation change of 54 m around an average of 18 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 72 m; within 80 km, large variations in elevation — a maximum elevation change of 840 m.
The land around Sōsa is covered by trees (41%) and cropland (39%) within 3 km, cropland (33%) and trees (32%) within 16 km, and water (42%) and trees (24%) 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 Sōsa (35.7154°, 140.5531°, elevation 36 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.