Kokubu-matsuki in Fall
In fall (September, October and November), Kokubu-matsuki sees average daytime highs around 23°C and overnight lows near 15°C, with 422 mm of rain over about 32 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 30°C in early September to 16°C by late November. The sky is clear or mostly clear about 37% of the time across fall, and the air most often feels dry.
Fall is Kokubu-matsuki's best season of the year to visit on our travel score. For the whole year in context, see Kokubu-matsuki's year-round climate.
- Avg daytime high
- 23°C
- 2nd-warmest season
- Avg overnight low
- 15°C
- Rainfall
- 422 mm
- 32 wet days
- Avg wind
- 7 km/h
- Travel score
- 6.2
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in Kokubu-matsuki in Fall
Over the season highs ease from about 30°C in early September to 16°C by late November.
A typical fall day in Kokubu-matsuki reaches about 23°C and drops to 15°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Kokubu-matsuki
Once humidity and wind are folded in, fall brings about 7 days 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.
Kokubu-matsuki 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 | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 11° / 3° | 80 | 8.3 | 10.2 | 2.8 |
| Feb | 12° / 3° | 102 | 9 | 10.8 | 3.3 |
| Mar | 16° / 6° | 157 | 12.9 | 11.8 | 4.6 |
| Apr | 20° / 11° | 181 | 11.8 | 12.8 | 5.9 |
| May | 24° / 15° | 205 | 11.7 | 13.6 | 6.4 |
| Jun | 26° / 20° | 488 | 19.9 | 14 | 4.8 |
| Jul | 30° / 24° | 299 | 19.4 | 13.9 | 3.9 |
| Aug | 31° / 24° | 174 | 18.3 | 13.2 | 3.8 |
| Sep | 28° / 21° | 202 | 15 | 12.2 | 5.2 |
| Oct | 24° / 15° | 114 | 9 | 11.2 | 7.1 |
| Nov | 18° / 9° | 107 | 8.2 | 10.4 | 6.2 |
| Dec | 13° / 4° | 81 | 7.1 | 10 | 4.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 37% of the time across fall.
Chance of precipitation in Fall
Kokubu-matsuki gets around 422 mm of rain over 32 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 7 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 42 min in early September to 10 h 06 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 3.6 kWh/m².
Hazard calendar for Kokubu-matsuki
In fall, Kokubu-matsuki overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Kokubu-matsuki sits in the Pacific typhoon belt; the season peaks July–October.
Kokubu-matsuki's rainy season runs June–July, when most of the year's rain falls.
Is fall a good time to visit Kokubu-matsuki?
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 Kokubu-matsuki for sightseeing.
What to pack for Kokubu-matsuki in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Kokubu-matsuki sees daytime highs around 23°C and nights near 15°C. Pack light clothes and rain gear. About 32 days see rain.
Sea temperature near Kokubu-matsuki in Fall
The nearest coast averages about 25°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 42 km away) is warmest in August at about 28°C and coldest in February near 18°C.
It's comfortable for a long swim from Apr 24 to Dec 26 — about 8.1 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 19 | 18 | 18 | 20 | 21 | 24 | 27 | 28 | 27 | 25 | 23 | 21 |
| Comfort | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Warm | Tropical | Warm | Warm | Refreshing | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 19 | Cool |
| Feb | 18 | Cool |
| Mar | 18 | Cool |
| Apr | 20 | Cool |
| May | 21 | Refreshing |
| Jun | 24 | Refreshing |
| Jul | 27 | Warm |
| Aug | 28 | Tropical |
| Sep | 27 | Warm |
| Oct | 25 | Warm |
| Nov | 23 | Refreshing |
| Dec | 21 | Refreshing |
UV index in Kokubu-matsuki in Fall
Clear-sky midday UV across fall averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Kokubu-matsuki peaks around June 23 at about 11 (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 — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 5 | 7 | 8 | 8 | 11 | 11 | 9 | 10 | 6 | 5 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | Moderate |
| Mar | 7 | High |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 9 | Very high |
| Sep | 10 | Very high |
| Oct | 6 | High |
| Nov | 5 | Moderate |
| Dec | 3 | Moderate |
Air quality in Kokubu-matsuki 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 Kokubu-matsuki is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 12 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 | 19 | 22 | 23 | 21 | 17 | 12 | 14 | 12 | 12 | 14 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 19 | Moderate |
| Mar | 22 | Moderate |
| Apr | 23 | Moderate |
| May | 21 | Moderate |
| Jun | 17 | Moderate |
| Jul | 12 | Moderate |
| Aug | 14 | Moderate |
| Sep | 12 | Moderate |
| Oct | 12 | Moderate |
| Nov | 14 | Moderate |
| Dec | 13 | Moderate |
Where is Kokubu-matsuki?
Kokubu-matsuki sits at 31.7°N, 130.8°E, 0 m above sea level, in Japan. The nearest listed city is Kirishima, 1.0 km away.
Topography around Kokubu-matsuki
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Kokubu-matsuki.
Within 3 km, the terrain around Kokubu-matsuki has only modest variations in elevation — a maximum elevation change of 220 m around an average of 26 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 603 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,680 m.
The land around Kokubu-matsuki is covered by artificial surfaces (48%), trees (24%) and cropland (21%) within 3 km, trees (60%) and water (26%) within 16 km, and trees (55%) and water (36%) 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 Kokubu-matsuki (31.7333°, 130.7667°, elevation 0 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.