Katsuyama in Fall
In fall (September, October and November), Katsuyama sees average daytime highs around 17°C and overnight lows near 10°C, with 597 mm of precipitation over about 44 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 9°C by late November. The sky is clear or mostly clear about 26% of the time across fall, and the air most often feels dry.
Fall is Katsuyama's 2nd-best season to visit on our travel score. For the whole year in context, see Katsuyama's year-round climate.
- Avg daytime high
- 17°C
- 2nd-warmest season
- Avg overnight low
- 10°C
- Precipitation
- 597 mm
- 44 wet days
- Avg wind
- 8 km/h
- Travel score
- 4.5
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Katsuyama in Fall
Over the season highs ease from about 25°C in early September to 9°C by late November.
A typical fall day in Katsuyama reaches about 17°C and drops to 10°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Katsuyama
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 10 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Katsuyama 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° / -5° | 180 | 21.8 | 20.6 | 9.8 | 0.0 |
| Feb | 3° / -5° | 146 | 17.4 | 15.5 | 10.6 | 0.0 |
| Mar | 7° / -2° | 184 | 17.1 | 10.4 | 11.7 | 0.7 |
| Apr | 13° / 4° | 175 | 14.2 | 2.9 | 12.9 | 3.3 |
| May | 18° / 10° | 192 | 14.4 | 0.1 | 13.9 | 5.3 |
| Jun | 22° / 15° | 243 | 15.4 | 0 | 14.4 | 5.4 |
| Jul | 26° / 19° | 321 | 19.5 | 0 | 14.2 | 5.1 |
| Aug | 27° / 20° | 194 | 17.2 | 0 | 13.4 | 5.4 |
| Sep | 23° / 16° | 248 | 15.4 | 0 | 12.2 | 5.7 |
| Oct | 18° / 10° | 189 | 13.3 | 0.1 | 11.1 | 5.2 |
| Nov | 11° / 3° | 161 | 15.3 | 3.4 | 10.1 | 2.5 |
| Dec | 5° / -2° | 187 | 20.6 | 15.3 | 9.6 | 0.2 |
Cloud cover in Fall
The sky is clear or mostly clear about 26% of the time across fall.
Chance of precipitation in Fall
Katsuyama gets around 597 mm of rain and snow over 44 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 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 3.3 kWh/m².
Hazard calendar for Katsuyama
In fall, Katsuyama overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Katsuyama sits in the Pacific typhoon belt; the season peaks July–October.
Is fall a good time to visit Katsuyama?
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 Katsuyama for sightseeing.
What to pack for Katsuyama in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Katsuyama sees daytime highs around 17°C and nights near 10°C. Pack a warm layer and rain gear. Worth having: light clothes. About 44 days see rain.
Sea temperature near Katsuyama in Fall
The nearest coast averages about 22°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 35 km away) is warmest in August at about 27°C and coldest in March near 11°C.
It's comfortable for a long swim from Jun 16 to Nov 5 — about 4.7 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 13 | 12 | 11 | 13 | 16 | 20 | 24 | 27 | 25 | 22 | 19 | 16 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 13 | Bracing |
| Feb | 12 | Bracing |
| Mar | 11 | Bracing |
| Apr | 13 | Bracing |
| May | 16 | Cool |
| Jun | 20 | Refreshing |
| Jul | 24 | Refreshing |
| Aug | 27 | Warm |
| Sep | 25 | Warm |
| Oct | 22 | Refreshing |
| Nov | 19 | Cool |
| Dec | 16 | Cool |
UV index in Katsuyama 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 Katsuyama peaks around July 17 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 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 | 8 | 10 | 10 | 10 | 9 | 6 | 3 | 3 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 3 | Moderate |
Air quality in Katsuyama 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 Katsuyama is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 10 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) | 11 | 14 | 19 | 20 | 19 | 17 | 13 | 12 | 11 | 10 | 11 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 14 | Moderate |
| Mar | 19 | Moderate |
| Apr | 20 | Moderate |
| May | 19 | Moderate |
| Jun | 17 | Moderate |
| Jul | 13 | Moderate |
| Aug | 12 | Good |
| Sep | 11 | Good |
| Oct | 10 | Good |
| Nov | 11 | Good |
| Dec | 10 | Good |
Where is Katsuyama?
Katsuyama sits at 36.1°N, 136.5°E, 130 m above sea level, in Japan. The nearest listed city is Ono, 9.0 km away.
Topography around Katsuyama
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Katsuyama.
Within 3 km, the terrain around Katsuyama has significant variations in elevation — a maximum elevation change of 446 m around an average of 193 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,627 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,671 m.
The land around Katsuyama is covered by trees (48%), cropland (24%) and artificial surfaces (22%) within 3 km, trees (85%) within 16 km, and trees (63%) and water (25%) 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 Katsuyama (36.0617°, 136.501°, elevation 130 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.