Kozakai-chō in Fall

In fall (September, October and November), Kozakai-chō sees average daytime highs around 22°C and overnight lows near 16°C, with 551 mm of rain over about 34 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.

Over the season highs ease from about 29°C in early September to 15°C by late November. The sky is clear or mostly clear about 42% of the time across fall, and the air most often feels dry.

Fall is Kozakai-chō's best season of the year to visit on our travel score. For the whole year in context, see Kozakai-chō's year-round climate.

Avg daytime high
22°C
2nd-warmest season
Avg overnight low
16°C
Rainfall
551 mm
34 wet days
Avg wind
15 km/h
Travel score
6.0
best season of the year
Months
Sep · Oct · Nov

Temperature in Kozakai-chō in Fall

Average highAverage lowShaded bands: 10–90% of days

Over the season highs ease from about 29°C in early September to 15°C by late November.

A typical fall day in Kozakai-chō reaches about 22°C and drops to 16°C overnight. The warmest of the three months is September, the coolest November.

10°20°30°SepOctNov

How fall really feels in Kozakai-chō

Once humidity and wind are folded in, fall brings about 2 days that feel above 32°C and 0 that feel at or below 0°C.

Days feeling ≥ 32°C
2
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Kozakai-chō 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan10° / 656.19.92.3
Feb10° / 777.110.72.6
Mar14° / 12910.311.74.0
Apr18° / 11°14310.312.85.8
May22° / 16°1641113.86.5
Jun25° / 20°23214.714.35.7
Jul29° / 24°22714.914.14.8
Aug30° / 25°13314.313.34.4
Sep27° / 22°23014.412.25.5
Oct22° / 16°21511.611.16.6
Nov17° / 11°1068.210.25.8
Dec12° / 666.49.73.6

Cloud cover in Fall

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time across fall.

0%25%50%75%100%SepOctNov

Chance of precipitation in Fall

Any precipitation

Kozakai-chō gets around 551 mm of rain over 34 wet days across fall. The line is the day-by-day chance of measurable precipitation.

0%20%40%60%SepOctNov

Humidity in Fall

DryComfortableHumidMuggyOppressiveMiserable

Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

0%25%50%75%100%SepOctNov

Wind in Fall

Winds average 15 km/h across fall.

05101520SepOctNov

Sunrise & sunset in Fall

DaylightNight

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.

12 AM4 AM8 AM12 PM4 PM8 PM12 AMSepOctNov

Solar energy in Fall

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day across fall, about 3.5 kWh/m².

024SepOctNov
Planning a trip in fall

Hazard calendar for Kozakai-chō

In seasonPeak

In fall, Kozakai-chō overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Kozakai-chō sits in the Pacific typhoon belt; the season peaks July–October.

Pacific typhoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is fall a good time to visit Kozakai-chō?

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.

6.0
Sightseeing
1st-best month of the year
4.0
Beach & pool
2nd-best month of the year

fall is a reasonable time to visit Kozakai-chō for sightseeing.

What to pack for Kozakai-chō in Fall

From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In fall, Kozakai-chō sees daytime highs around 22°C and nights near 16°C. Pack light clothes and rain gear. About 34 days see rain.

light clothesrain gear

Sea temperature near Kozakai-chō 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 20 km away) is warmest in August at about 27°C and coldest in February near 16°C.

It's comfortable for a long swim from May 26 to Nov 26 — about 6.1 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb16Cool
Mar16Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Kozakai-chō in Fall

LowModerateHighVery highExtreme

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 Kozakai-chō peaks around July 11 at about 10 (very high) — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 11UV 10Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Kozakai-chō in Fall

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.

Air quality in Kozakai-chō is worst in April — around 25 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (July, 15 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1325 µg/m³Jul 2415 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb19Moderate
Mar25Moderate
Apr25Moderate
May24Moderate
Jun20Moderate
Jul15Moderate
Aug15Moderate
Sep16Moderate
Oct18Moderate
Nov18Moderate
Dec16Moderate
Location & terrain

Where is Kozakai-chō?

Kozakai-chō sits at 34.8°N, 137.4°E, 7 m above sea level, in Japan. The nearest listed city is Toyokawa, 4.0 km away.

Topography around Kozakai-chō

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Kozakai-chō.

Within 3 km, the terrain around Kozakai-chō has only modest variations in elevation — a maximum elevation change of 28 m around an average of 6 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 787 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,181 m.

The land around Kozakai-chō is covered by artificial surfaces (63%) and cropland (24%) within 3 km, trees (43%) and artificial surfaces (25%) within 16 km, and trees (43%) and water (36%) within 80 km.

3 km
28 m
16 km
787 m
80 km
2,181 m
treesgrasslandcroplandartificial surfacesbare terrainwater
Fall weather nearby: Toyokawa 4.0 km · Toyohashi 4.0 km · Gamagōri 12 km · Tahara 17 km · Shinshiro 17 km · Kosai 19 km · Kōta 19 km · Arai 23 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
Shintoism 49%Buddhism 46%other 4%Christianity 1%

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 Kozakai-chō (34.8°, 137.3589°, elevation 7 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.