Owariasahi weather in September

In September, Owariasahi sees average daytime highs of 29°C and overnight lows near 20°C, with 186 mm of rain across 12.1 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 31°C in the first days to 26°C by the end. The sky is clear or mostly clear about 33% 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 Owariasahi's 9th-clearest and 8th-windiest month. For the whole year in context, see Owariasahi's year-round climate.

Daytime high
29°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
186 mm
12.1 wet days
Daylight
12 h 12 min
5:40 AM – 5:53 PM
Cloud cover
60%
9th clearest
Wind
8 km/h
8th windiest
Solar energy
4.14 kWh/m²
Travel score
5.3
out of 10

Owariasahi is city in Aichi prefecture, Japan.

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 31°C in the first days to 26°C by the end.

A typical September day in Owariasahi reaches about 29°C in the afternoon and slips back to 20°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 32°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53122
63022
73022
83022
93022
103022
113021
122921
132921
142921
152921
162920
172820
182820
192820
202820
212819
222719
232719
242719
252718
262718
272618
282618
292618
302617

How September really feels in Owariasahi

Once humidity and wind are folded in, September averages 7 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
7
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.

Owariasahi weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 545.70.39.92.2
Feb11° / 606.50.610.72.7
Mar14° / 11010.1011.74.3
Apr19° / 12310.6012.96.1
May24° / 14°14410.6013.86.7
Jun27° / 19°17814.3014.35.5
Jul31° / 23°19015014.14.0
Aug32° / 24°11211.8013.33.7
Sep29° / 20°18612.1012.25.3
Oct23° / 14°17110.3011.16.8
Nov17° / 857.2010.15.9
Dec12° / 5560.19.73.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% 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 (%)
14951
24951
34951
44951
54951
64951
74852
84852
94753
104753
114753
124753
134654
144654
154654
164654
174555
184555
194555
204555
214555
224555
234654
244654
254654
264654
274654
284654
294654
304753

Chance of precipitation in September

Any precipitation

Owariasahi gets around 186 mm of rain over 12.1 wet days in September. 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 (%)
141
241
342
442
543
643
743
843
943
1043
1143
1243
1342
1442
1541
1641
1740
1840
1940
2039
2139
2239
2339
2439
2538
2638
2738
2838
2938
3038

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 31% of days. Sticky, muggy-or-worse air turns up on roughly 60% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1121230505
2121231505
3131231484
4131332474
5131333464
6141434444
7141434433
8251535413
9261535393
10261636372
11371736362
12371836342
13481936322
14492035302
15592135282
165102335261
176112434231
187122534211
198132633191
209142732181
2110152831161
2210162930141
2311173029121
2412183128111
2513193226100
261420322580
271521332470
281622332360
291722342150
301823342040

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 5:51 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
412.75:316:11
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
3011.75:515:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.14 kWh/m².

For context, solar energy here swings from a low near 2.49 kWh/m² to a high of 5.46 kWh/m² in May across the year — September's 4.14 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.5Bright
44.5Bright
54.5Bright
64.4Bright
74.4Bright
84.4Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.1Bright
184.0Bright
194.0Bright
204.0Bright
214.0Moderate
224.0Moderate
233.9Moderate
243.9Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Owariasahi

In seasonPeak

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

Owariasahi 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 Owariasahi?

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

5.3
Sightseeing
6th-best month of the year
6.3
Beach & pool
1st-best month of the year

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

What to pack for Owariasahi in September

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

In September, Owariasahi sees daytime highs around 29°C and nights near 20°C. Pack light clothes. Worth having: rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Owariasahi 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 40 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 Owariasahi 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 Owariasahi peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 12UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Owariasahi 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 Owariasahi 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 Owariasahi?

Owariasahi sits at 35.2°N, 137.0°E, 48 m above sea level, in Japan. The nearest listed city is Nagakute, 5.0 km away.

Topography around Owariasahi

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

Within 3 km, the terrain around Owariasahi has only modest variations in elevation — a maximum elevation change of 98 m around an average of 65 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 708 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,265 m.

The land around Owariasahi is covered by artificial surfaces (70%) and trees (20%) within 3 km, artificial surfaces (53%) and trees (37%) within 16 km, and trees (62%) within 80 km.

3 km
98 m
16 km
708 m
80 km
2,265 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Nagakute 5.0 km · Kasugai 7.0 km · Seto 7.0 km · Nisshin 8.0 km · Nagoya 12 km · Toyoyama 12 km · Morowa 12 km · Komaki 13 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 Owariasahi (35.208°, 137.03°, elevation 48 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).