Okazaki weather in September

In September, Okazaki sees average daytime highs of 27°C and overnight lows near 20°C, with 239 mm of rain across 14.9 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 29°C in the first days to 25°C by the end. The sky is clear or mostly clear about 26% 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 Okazaki's 9th-clearest and 10th-windiest month. For the whole year in context, see Okazaki's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
239 mm
14.9 wet days
Daylight
12 h 12 min
5:39 AM – 5:52 PM
Cloud cover
64%
9th clearest
Wind
9 km/h
10th windiest
Solar energy
4.15 kWh/m²
Travel score
5.4
out of 10

Okazaki is city in Aichi Prefecture, Japan.

Founded
1916

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 29°C in the first days to 25°C by the end.

A typical September day in Okazaki reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13022
22922
32922
42922
52922
62922
72921
82921
92821
102821
112821
122821
132820
142820
152720
162720
172720
182719
192719
202619
212619
222619
232618
242618
252618
262518
272518
282517
292517
302517

How September really feels in Okazaki

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Okazaki weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6360.69.91.7
Feb / 766.80.810.72.1
Mar13° / 13610.80.111.73.7
Apr18° / 15111.1012.95.6
May23° / 14°17212.4013.86.3
Jun26° / 18°24216.5014.35.3
Jul29° / 23°27818.9014.14.2
Aug31° / 23°17417.3013.33.9
Sep27° / 20°23914.9012.25.4
Oct22° / 14°20412.1011.16.4
Nov16° / 1048.3010.25.4
Dec11° / 656.40.19.72.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14456
24456
34456
44357
54357
64357
74258
84258
94159
104159
114159
124159
134060
144159
154060
163961
174060
184060
193961
204060
213961
224060
233961
244060
254060
264060
274159
284258
294258
304258

Chance of precipitation in September

Any precipitation

Okazaki gets around 239 mm of rain over 14.9 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 51% and peaks near 56% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
155
256
356
456
555
655
755
854
954
1054
1153
1252
1352
1451
1550
1649
1749
1848
1948
2047
2147
2247
2347
2446
2546
2647
2747
2847
2947
3047

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 58% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1021133513
2021234493
3131234473
4131235463
5131336442
6141437432
7151437412
8151537392
9161638372
10261738352
11271938332
12282037312
13392137291
143102337271
154112436251
164122535231
175132635211
186142734191
196152833171
207162932151
218173030140
229183129120
2310193228110
241120322790
251221332580
261422332470
271523342360
281624342150
291725342050
301825341940

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 6:14 PM to 5:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:286:14
212.75:296:13
312.75:296:11
412.75:306:10
512.65:316:08
612.65:326:07
712.65:326:06
812.55:336:04
912.55:346:03
1012.45:356:01
1112.45:356:00
1212.45:365:58
1312.35:375:57
1412.35:385:55
1512.35:385:54
1612.25:395:52
1712.25:405:51
1812.15:415:49
1912.15:415:48
2012.15:425:46
2112.05:435:45
2212.05:445:43
2312.05:445:42
2411.95:455:40
2511.95:465:39
2611.85:475:37
2711.85:485:36
2811.85:485:34
2911.75:495:33
3011.75:505:31

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².

For context, solar energy here swings from a low near 2.57 kWh/m² to a high of 5.45 kWh/m² in May across the year — September's 4.15 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.4Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.0Bright
204.0Bright
214.0Moderate
223.9Moderate
233.9Moderate
243.9Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.8Moderate
293.7Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Okazaki

In seasonPeak

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

Okazaki 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 Okazaki?

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

5.4
Sightseeing
4th-best month of the year
5.7
Beach & pool
1st-best month of the year

September is a reasonable time to visit Okazaki for sightseeing.

What to pack for Okazaki in September

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

In September, Okazaki sees daytime highs around 27°C and nights near 20°C. Pack light clothes and rain gear. About 15 days see rain.

light clothesrain gear

Sea temperature near Okazaki 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 28 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 Okazaki 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 Okazaki 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 Okazaki 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 Okazaki 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 Okazaki?

Okazaki sits at 35.0°N, 137.2°E, 34 m above sea level, in Japan. The nearest listed city is Anjō, 8.0 km away.

Topography around Okazaki

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

Within 3 km, the terrain around Okazaki has only modest variations in elevation — a maximum elevation change of 104 m around an average of 28 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 614 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,181 m.

The land around Okazaki is covered by artificial surfaces (76%) within 3 km, trees (44%) and artificial surfaces (35%) within 16 km, and trees (49%) and water (27%) within 80 km.

3 km
104 m
16 km
614 m
80 km
2,181 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Anjō 8.0 km · Kōta 8.0 km · Chiryū 13 km · Nishio 14 km · Gamagōri 14 km · Toyota 15 km · Miyoshi 17 km · Kariya 17 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 Okazaki (34.95°, 137.1667°, elevation 34 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).