Hiroshima in Fall
In fall (September, October and November), Hiroshima sees average daytime highs around 21°C and overnight lows near 13°C, with 368 mm of precipitation over about 29 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 29°C in early September to 13°C by late November. The sky is clear or mostly clear about 33% of the time across fall, and the air most often feels dry.
Fall is Hiroshima's best season of the year to visit on our travel score. For the whole year in context, see Hiroshima's year-round climate.
- Avg daytime high
- 21°C
- 2nd-warmest season
- Avg overnight low
- 13°C
- Precipitation
- 368 mm
- 29 wet days
- Avg wind
- 8 km/h
- Travel score
- 6.0
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in Hiroshima in Fall
Over the season highs ease from about 29°C in early September to 13°C by late November.
A typical fall day in Hiroshima reaches about 21°C and drops to 13°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Hiroshima
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.
Hiroshima 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 | 8° / 0° | 55 | 9.4 | 5.3 | 10 | 1.2 |
| Feb | 9° / 1° | 66 | 9.7 | 4 | 10.7 | 1.7 |
| Mar | 13° / 3° | 110 | 11.7 | 1.7 | 11.7 | 3.4 |
| Apr | 18° / 8° | 124 | 10.3 | 0.1 | 12.8 | 5.7 |
| May | 23° / 13° | 143 | 10.3 | 0 | 13.8 | 6.6 |
| Jun | 25° / 18° | 215 | 14.3 | 0 | 14.3 | 5.7 |
| Jul | 29° / 22° | 251 | 16.1 | 0 | 14.1 | 4.6 |
| Aug | 30° / 23° | 157 | 14 | 0 | 13.3 | 4.3 |
| Sep | 27° / 19° | 188 | 12.6 | 0 | 12.2 | 5.9 |
| Oct | 22° / 13° | 109 | 8.3 | 0 | 11.1 | 6.9 |
| Nov | 16° / 7° | 71 | 8.1 | 0.1 | 10.2 | 5.1 |
| Dec | 10° / 2° | 64 | 9.6 | 2.9 | 9.7 | 2.4 |
Cloud cover in Fall
The sky is clear or mostly clear about 33% of the time across fall.
Chance of precipitation in Fall
Hiroshima gets around 368 mm of rain and snow over 29 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 8 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 48 min in early September to 9 h 54 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 3.5 kWh/m².
Hazard calendar for Hiroshima
In fall, Hiroshima overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Hiroshima sits in the Pacific typhoon belt; the season peaks July–October.
Hiroshima's rainy season runs April–September, when most of the year's rain falls.
Is fall a good time to visit Hiroshima?
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 Hiroshima for sightseeing.
What to pack for Hiroshima in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Hiroshima sees daytime highs around 21°C and nights near 13°C. Worth packing: light clothes, a warm layer and rain gear. About 29 days see rain.
Sea temperature near Hiroshima 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 31 km away) is warmest in August at about 26°C and coldest in February near 13°C.
It's comfortable for a long swim from Jun 13 to Nov 17 — about 5.2 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 13 | 13 | 15 | 17 | 20 | 24 | 26 | 25 | 23 | 20 | 17 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Warm | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Bracing |
| Feb | 13 | Bracing |
| Mar | 13 | Bracing |
| Apr | 15 | Bracing |
| May | 17 | Cool |
| Jun | 20 | Refreshing |
| Jul | 24 | Warm |
| Aug | 26 | Warm |
| Sep | 25 | Warm |
| Oct | 23 | Refreshing |
| Nov | 20 | Refreshing |
| Dec | 17 | Cool |
UV index in Hiroshima 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 Hiroshima peaks around July 13 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 3 (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) | 3 | 4 | 5 | 7 | 8 | 10 | 10 | 9 | 9 | 6 | 4 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Very high | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | High |
| Apr | 7 | Very high |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Hiroshima 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 Hiroshima is worst in April — around 16 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 8 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Hiroshima's WHO annual average of 11 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 12 | 15 | 16 | 14 | 13 | 10 | 10 | 9 | 8 | 8 | 8 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 12 | Good |
| Mar | 15 | Moderate |
| Apr | 16 | Moderate |
| May | 14 | Moderate |
| Jun | 13 | Moderate |
| Jul | 10 | Good |
| Aug | 10 | Good |
| Sep | 9 | Good |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Hiroshima?
Hiroshima sits at 34.4°N, 132.4°E, 16 m above sea level, in Japan. The nearest listed city is Gion, 4.0 km away.
Topography around Hiroshima
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hiroshima.
Within 3 km, the terrain around Hiroshima has significant variations in elevation — a maximum elevation change of 342 m around an average of 30 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 978 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,327 m.
The land around Hiroshima is covered by artificial surfaces (68%) within 3 km, trees (54%) and artificial surfaces (24%) within 16 km, and trees (64%) and water (29%) 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 Hiroshima (34.4°, 132.45°, elevation 16 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.