Yachimata in Fall
In fall (September, October and November), Yachimata sees average daytime highs around 21°C and overnight lows near 16°C, with 484 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 29°C in early September to 14°C by late November. The sky is clear or mostly clear about 32% of the time across fall, and the air most often feels dry.
Fall is Yachimata's best season of the year to visit on our travel score. For the whole year in context, see Yachimata's year-round climate.
- Avg daytime high
- 21°C
- 2nd-warmest season
- Avg overnight low
- 16°C
- Rainfall
- 484 mm
- 38 wet days
- Avg wind
- 11 km/h
- Travel score
- 5.6
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in Yachimata in Fall
Over the season highs ease from about 29°C in early September to 14°C by late November.
A typical fall day in Yachimata 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 Yachimata
Once humidity and wind are folded in, fall brings about 1 day that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Yachimata 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° / 2° | 75 | 7.6 | 0.8 | 9.9 | 2.1 |
| Feb | 10° / 3° | 71 | 8.4 | 1.1 | 10.7 | 2.3 |
| Mar | 13° / 6° | 125 | 12.8 | 0.5 | 11.7 | 3.5 |
| Apr | 18° / 10° | 113 | 12.6 | 0 | 12.9 | 5.3 |
| May | 22° / 15° | 128 | 11.6 | 0 | 13.9 | 6.3 |
| Jun | 25° / 19° | 159 | 13.7 | 0 | 14.4 | 5.8 |
| Jul | 29° / 23° | 150 | 13.8 | 0 | 14.2 | 4.9 |
| Aug | 30° / 24° | 114 | 11.9 | 0 | 13.3 | 4.5 |
| Sep | 27° / 21° | 175 | 14.3 | 0 | 12.2 | 5.6 |
| Oct | 21° / 16° | 207 | 13 | 0 | 11.1 | 6.1 |
| Nov | 16° / 10° | 102 | 10.4 | 0 | 10.1 | 5.2 |
| Dec | 12° / 5° | 68 | 8.4 | 0.1 | 9.6 | 3.2 |
Cloud cover in Fall
The sky is clear or mostly clear about 32% of the time across fall.
Chance of precipitation in Fall
Yachimata gets around 484 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 11 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 3.1 kWh/m².
Hazard calendar for Yachimata
In fall, Yachimata overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Yachimata sits in the Pacific typhoon belt; the season peaks July–October.
Is fall a good time to visit Yachimata?
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 Yachimata for sightseeing.
What to pack for Yachimata in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Yachimata 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 Yachimata 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 at the nearest coast (about 28 km away) 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 Yachimata 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 Yachimata 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 Yachimata 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 Yachimata 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 Yachimata?
Yachimata sits at 35.6°N, 140.3°E, 47 m above sea level, in Japan. The nearest listed city is Ryōgoku, 9.0 km away.
Topography around Yachimata
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Yachimata.
Within 3 km, the terrain around Yachimata has only modest variations in elevation — a maximum elevation change of 57 m around an average of 46 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 114 m; within 80 km, large variations in elevation — a maximum elevation change of 840 m.
The land around Yachimata is covered by trees (38%), artificial surfaces (32%) and cropland (25%) within 3 km, trees (44%), cropland (26%) and artificial surfaces (24%) within 16 km, and water (39%), trees (23%) and artificial surfaces (22%) 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 Yachimata (35.65°, 140.3167°, elevation 47 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.