Chiryū weather in September

In September, Chiryū sees average daytime highs of 28°C and overnight lows near 21°C, with 193 mm of rain across 12.2 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 30°C in the first days to 26°C by the end. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Chiryū's 9th-clearest and 8th-windiest month. For the whole year in context, see Chiryū's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
193 mm
12.2 wet days
Daylight
12 h 12 min
5:40 AM – 5:53 PM
Cloud cover
60%
9th clearest
Wind
11 km/h
8th windiest
Solar energy
4.25 kWh/m²
Travel score
5.4
out of 10

Chiryū is city in Aichi Prefecture, Japan.

Density
4,418/km²
people per km²
Founded
1970

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 30°C in the first days to 26°C by the end.

A typical September day in Chiryū reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 31°C. Set against its neighbours, September runs about 3°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13124
23124
33024
43023
53023
63023
73023
83023
93023
102923
112922
122922
132922
142922
152922
162821
172821
182821
192821
202821
212720
222720
232720
242720
252720
262619
272619
282619
292619
302619

How September really feels in Chiryū

Once humidity and wind are folded in, September averages 8 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
8
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Chiryū weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan10° / 545.79.92.4
Feb11° / 616.310.72.8
Mar14° / 1089.611.74.3
Apr19° / 10°1169.912.96.1
May24° / 15°13810.313.86.7
Jun27° / 20°17813.414.35.7
Jul30° / 24°18614.714.14.3
Aug32° / 25°11012.413.33.9
Sep28° / 21°19312.212.25.4
Oct23° / 15°17910.511.16.8
Nov17° / 847.210.26.0
Dec12° / 565.69.73.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
35050
45050
54852
64852
74852
84852
94753
104753
114654
124654
134654
144555
154555
164555
174555
184555
194555
204555
214456
224456
234555
244654
254654
264654
274654
284654
294753
304654

Chance of precipitation in September

Any precipitation

Chiryū gets around 193 mm of rain over 12.2 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 43% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
143
243
343
443
543
643
743
842
942
1042
1142
1241
1341
1441
1540
1640
1740
1840
1940
2040
2140
2240
2340
2440
2540
2641
2741
2841
2941
3041

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 30% of days. Sticky, muggy-or-worse air turns up on roughly 65% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1118265212
2129265111
3129275011
41210285010
51210284810
6131029479
7131130468
8141231458
9241231437
10251332427
11251432406
12261533386
13371633366
14371733345
15481833325
16491934304
175102034274
186112234253
196122333233
207122433213
218132533192
229142632172
2310142731152
2411152930141
2512163029121
2613163128111
2714173227101
281518332681
291518332571
301619342461

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:28 AM to 5:50 AM, and sunset from 6:15 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:286:15
212.75:296:13
312.75:306:12
412.75:316:10
512.65:316:09
612.65:326:08
712.65:336:06
812.55:346:05
912.55:346:03
1012.45:356:02
1112.45:366:00
1212.45:375:59
1312.35:375:57
1412.35:385:56
1512.35:395:54
1612.25:405:53
1712.25:405:51
1812.15:415:50
1912.15:425:48
2012.15:435:47
2112.05:435:45
2212.05:445:44
2312.05:455:42
2411.95:465:41
2511.95:475:39
2611.85:475:38
2711.85:485:36
2811.85:495:35
2911.75:505:33
3011.75:505:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 2.57 kWh/m² to a high of 5.54 kWh/m² in May across the year — September's 4.25 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.7Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.1Bright
224.0Bright
234.0Bright
244.0Moderate
254.0Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Chiryū

In seasonPeak

In September, Chiryū sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Chiryū 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 September a good time to visit Chiryū?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.4
Sightseeing
6th-best month of the year
6.3
Beach & pool
1st-best month of the year

September is a reasonable time to visit Chiryū for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Chiryū in September

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

In September, Chiryū sees daytime highs around 28°C and nights near 21°C. Pack light clothes. Worth having: rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Chiryū in September

The nearest coast averages about 26°C in September — 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 13°C.

It's comfortable for a long swim from May 31 to Nov 9 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Chiryū in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chiryū 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 Chiryū in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Chiryū is worst in April — around 22 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1322 µg/m³Dec 1813 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun19Moderate
Jul15Moderate
Aug14Moderate
Sep14Moderate
Oct15Moderate
Nov15Moderate
Dec13Moderate
Location & terrain

Where is Chiryū?

Chiryū sits at 35.0°N, 137.0°E, 15 m above sea level, in Japan. The nearest listed city is Kariya, 5.0 km away.

Topography around Chiryū

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

Within 3 km, the terrain around Chiryū has only modest variations in elevation — a maximum elevation change of 29 m around an average of 12 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 257 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,181 m.

The land around Chiryū is covered by artificial surfaces (79%) within 3 km, artificial surfaces (59%) and cropland (20%) within 16 km, and trees (52%) and water (23%) within 80 km.

3 km
29 m
16 km
257 m
80 km
2,181 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kariya 5.0 km · Toyoake 5.0 km · Anjō 6.0 km · Ogawa 7.0 km · Ōbu 8.0 km · Takahama 10 km · Miyoshi 11 km · Morowa 12 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 Chiryū (35°, 137.0333°, elevation 15 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).