Kaizu weather in September

In September, Kaizu sees average daytime highs of 28°C and overnight lows near 20°C, with 248 mm of rain across 14 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 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 Kaizu's 9th-clearest and 7th-windiest month. For the whole year in context, see Kaizu's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
248 mm
14 wet days
Daylight
12 h 12 min
5:41 AM – 5:54 PM
Cloud cover
61%
9th clearest
Wind
7 km/h
7th windiest
Solar energy
4.15 kWh/m²
Travel score
5.3
out of 10

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 Kaizu reaches about 28°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 24°C and 31°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)
13023
23023
33023
43023
53022
63022
73022
82922
92922
102922
112921
122921
132921
142821
152821
162820
172820
182820
192720
202720
212719
222719
232719
242719
252619
262618
272618
282618
292618
302517

How September really feels in Kaizu

Once humidity and wind are folded in, September averages 6 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
6
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.

Kaizu 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 / 6370.99.92.0
Feb10° / 697.11.110.72.4
Mar14° / 12710.70.111.74.0
Apr19° / 14711.2012.95.9
May24° / 14°17611.9013.86.5
Jun27° / 19°22215.1014.35.4
Jul30° / 23°27618.4014.13.8
Aug32° / 24°18115.5013.33.6
Sep28° / 20°24814012.25.3
Oct23° / 14°19211.3011.16.7
Nov17° / 997.6010.15.7
Dec11° / 656.80.39.73.3

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 13% of September, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24654
34555
44654
54654
64654
74555
84654
94654
104555
114555
124555
134654
144555
154456
164555
174555
184456
194357
204456
214456
224555
234555
244456
254456
264555
274555
284555
294555
304555

Chance of precipitation in September

Any precipitation

Kaizu gets around 248 mm of rain over 14 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 47% and peaks near 51% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
150
250
351
451
551
651
751
851
951
1051
1150
1250
1349
1448
1548
1647
1746
1846
1945
2045
2144
2244
2344
2443
2543
2643
2743
2843
2943
3043

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 64% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1027285310
2027295210
312830509
412830518
512931498
6131032487
7131033466
8141133456
9141234435
10251433415
11251534404
12261634384
13271734363
14371934343
15382134322
16392234302
174102433272
184112533251
195122632231
206132831211
217142931191
227153030171
238163129150
249173228130
2510183327120
2611193426100
271219352590
281320362470
291421362260
301521372150

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 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
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:30 AM to 5:52 AM, and sunset from 6:16 PM to 5:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:306:16
212.75:316:15
312.75:316:14
412.75:326:12
512.65:336:11
612.65:346:09
712.65:346:08
812.55:356:06
912.55:366:05
1012.45:376:03
1112.45:376:02
1212.45:386:00
1312.35:395:59
1412.35:405:57
1512.35:405:56
1612.25:415:54
1712.25:425:53
1812.15:435:51
1912.15:445:50
2012.15:445:48
2112.05:455:47
2212.05:465:45
2312.05:475:44
2411.95:475:42
2511.95:485:41
2611.85:495:39
2711.85:505:38
2811.85:515:36
2911.75:515:35
3011.75:525:33

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 2.44 kWh/m² to a high of 5.44 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
44.5Bright
54.5Bright
64.5Bright
74.4Bright
84.4Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.0Bright
204.0Bright
214.0Moderate
224.0Moderate
233.9Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Kaizu

In seasonPeak

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

Kaizu 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 Kaizu?

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
6.0
Beach & pool
1st-best month of the year

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

What to pack for Kaizu in September

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

In September, Kaizu sees daytime highs around 28°C and nights near 20°C. Pack light clothes and rain gear. About 14 days see rain.

light clothesrain gear

Sea temperature near Kaizu 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 36 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
Jul26Warm
Aug27Warm
Sep26Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Kaizu 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 Kaizu peaks around July 13 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 13UV 10Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Kaizu 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 Kaizu is worst in April — around 26 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1125 µg/m³Aug 1817 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb20Moderate
Mar25Moderate
Apr26Moderate
May25Moderate
Jun21Moderate
Jul17Moderate
Aug17Moderate
Sep17Moderate
Oct18Moderate
Nov18Moderate
Dec16Moderate
Location & terrain

Where is Kaizu?

Kaizu sits at 35.2°N, 136.6°E, -1 m above sea level, in Japan. The nearest listed city is Tsushima, 8.0 km away.

Topography around Kaizu

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

Within 3 km, the terrain around Kaizu has significant variations in elevation — a maximum elevation change of 506 m around an average of 33 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 904 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,608 m.

The land around Kaizu is covered by cropland (47%) and trees (21%) within 3 km, trees (31%), cropland (30%) and artificial surfaces (28%) within 16 km, and trees (60%) within 80 km.

3 km
506 m
16 km
904 m
80 km
1,608 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Tsushima 8.0 km · Sobue 9.0 km · Aisai 10 km · Inabe 11 km · Tōin 12 km · Takada 13 km · Yatomi 14 km · Inazawa 14 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 Kaizu (35.2017°, 136.6351°, elevation -1 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).