Imaichi in Fall
In fall (September, October and November), Imaichi sees average daytime highs around 18°C and overnight lows near 10°C, with 605 mm of precipitation over about 48 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 25°C in early September to 10°C by late November. The sky is clear or mostly clear about 27% of the time across fall, and the air most often feels dry.
Fall is Imaichi's 2nd-best season to visit on our travel score. For the whole year in context, see Imaichi's year-round climate.
- Avg daytime high
- 18°C
- 2nd-warmest season
- Avg overnight low
- 10°C
- Precipitation
- 605 mm
- 48 wet days
- Avg wind
- 5 km/h
- Travel score
- 4.3
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Imaichi in Fall
Over the season highs ease from about 25°C in early September to 10°C by late November.
A typical fall day in Imaichi reaches about 18°C and drops to 10°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Imaichi
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.
Imaichi 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 | 4° / -3° | 61 | 8.5 | 8.3 | 9.8 | 0.0 |
| Feb | 5° / -3° | 59 | 8.9 | 7.1 | 10.6 | 0.1 |
| Mar | 9° / -0° | 122 | 14.2 | 7.6 | 11.7 | 1.5 |
| Apr | 14° / 5° | 152 | 15.1 | 2.1 | 12.9 | 3.7 |
| May | 19° / 10° | 197 | 17.4 | 0.1 | 13.9 | 5.0 |
| Jun | 22° / 15° | 255 | 21.8 | 0 | 14.5 | 4.5 |
| Jul | 26° / 19° | 343 | 25.8 | 0 | 14.3 | 4.2 |
| Aug | 27° / 20° | 285 | 23.9 | 0 | 13.4 | 4.4 |
| Sep | 23° / 17° | 290 | 20.3 | 0 | 12.2 | 4.9 |
| Oct | 18° / 10° | 220 | 17.5 | 0.1 | 11.1 | 4.7 |
| Nov | 12° / 4° | 95 | 10 | 0.4 | 10 | 3.3 |
| Dec | 7° / -1° | 61 | 9 | 5.1 | 9.5 | 0.8 |
Cloud cover in Fall
The sky is clear or mostly clear about 27% of the time across fall.
Chance of precipitation in Fall
Imaichi gets around 605 mm of rain and snow over 48 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 5 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 48 min in early September to 9 h 42 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 3.0 kWh/m².
Hazard calendar for Imaichi
In fall, Imaichi overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Imaichi's rainy season runs May–October, when most of the year's rain falls.
Is fall a good time to visit Imaichi?
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 Imaichi for sightseeing.
What to pack for Imaichi in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Imaichi sees daytime highs around 18°C and nights near 10°C. Pack rain gear. Worth having: light clothes and a warm layer. About 48 days see rain.
UV index in Imaichi 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 Imaichi peaks around July 18 at about 10 (very high) — 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 | 5 | 7 | 9 | 9 | 10 | 9 | 9 | 6 | 3 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | High |
| Apr | 7 | High |
| May | 9 | Very high |
| Jun | 9 | Very high |
| Jul | 10 | Very high |
| Aug | 9 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Air quality in Imaichi 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 Imaichi is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× 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 | 16 | 14 | 13 | 11 | 11 | 10 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | 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 | 16 | Moderate |
| Jul | 14 | Moderate |
| Aug | 13 | Moderate |
| Sep | 11 | Good |
| Oct | 11 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Imaichi?
Imaichi sits at 36.7°N, 139.7°E, 391 m above sea level, in Japan. The nearest listed city is Nikko, 7.0 km away.
Topography around Imaichi
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Imaichi.
Within 3 km, the terrain around Imaichi has significant variations in elevation — a maximum elevation change of 342 m around an average of 421 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,085 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,551 m.
The land around Imaichi is covered by trees (61%) within 3 km, trees (82%) within 16 km, and trees (70%) 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 Imaichi (36.7167°, 139.6833°, elevation 391 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.