Kimitsu weather in September

In September, Kimitsu sees average daytime highs of 25°C and overnight lows near 22°C, with 185 mm of rain across 13.2 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 26°C in the first days to 23°C by the end. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels oppressive.

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 Kimitsu's 9th-clearest and 9th-windiest month. For the whole year in context, see Kimitsu's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
185 mm
13.2 wet days
Daylight
12 h 12 min
5:28 AM – 5:41 PM
Cloud cover
62%
9th clearest
Wind
18 km/h
9th windiest
Solar energy
3.93 kWh/m²
Travel score
6.2
out of 10

Kimitsu is city in Chiba Prefecture, Japan.

Density
261/km²
people per km²
Founded
1971

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 26°C in the first days to 23°C by the end.

A typical September day in Kimitsu reaches about 25°C in the afternoon and slips back to 22°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 27°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12724
22724
32624
42624
52624
62624
72624
82624
92624
102623
112623
122623
132623
142523
152523
162522
172522
182522
192522
202522
212422
222421
232421
242421
252421
262421
272421
282321
292320
302320

Kimitsu 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
Jan10° / 827.40.49.92.5
Feb10° / 838.50.710.72.4
Mar13° / 144130.211.73.3
Apr16° / 13°12611.6012.94.8
May19° / 17°13810.9013.86.0
Jun22° / 20°18212.9014.35.8
Jul25° / 23°14711.5014.16.4
Aug27° / 25°1079.8013.36.5
Sep25° / 22°18513.2012.26.2
Oct21° / 18°22212.7011.16.1
Nov17° / 13°11510.7010.15.3
Dec13° / 738.509.73.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% 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 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24852
34852
44753
54753
64852
74852
84753
94753
104753
114753
124654
134654
144555
154555
164555
174456
184357
194258
204258
214258
224060
234060
244060
254060
264060
274060
284060
294060
304060

Chance of precipitation in September

Any precipitation

Kimitsu gets around 185 mm of rain over 13.2 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 44% and peaks near 47% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
138
238
339
439
540
641
741
842
943
1043
1144
1244
1345
1445
1545
1645
1746
1846
1946
2047
2147
2247
2346
2446
2546
2646
2747
2847
2947
3047

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 32% of days. Sticky, muggy-or-worse air turns up on roughly 72% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1004204728
2005214727
3005224726
4006234624
5006244623
6017254522
7018264520
8019274419
90210284317
100211294216
111312294214
121313304013
131414303911
141515313810
15261632369
16271732358
17281933336
18292033315
193102133294
203112233274
213122334253
224132434222
234142634202
245152733182
255162833171
266162933151
276173033131
287173132121
297183231101
30819333090

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze

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 5:17 AM to 5:39 AM, and sunset from 6:04 PM to 5:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:176:04
212.75:186:02
312.75:186:01
412.75:195:59
512.65:205:58
612.65:215:56
712.65:215:55
812.55:225:53
912.55:235:52
1012.45:245:50
1112.45:245:49
1212.45:255:47
1312.35:265:46
1412.35:275:44
1512.35:275:43
1612.25:285:41
1712.25:295:40
1812.15:305:38
1912.15:315:37
2012.15:315:35
2112.05:325:34
2212.05:335:32
2312.05:345:31
2411.95:345:29
2511.95:355:28
2611.85:365:26
2711.85:375:25
2811.85:385:23
2911.75:385:22
3011.75:395:20

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.93 kWh/m².

For context, solar energy here swings from a low near 2.28 kWh/m² to a high of 5.25 kWh/m² in May across the year — September's 3.93 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.5Bright
34.5Bright
44.5Bright
54.4Bright
64.4Bright
74.3Bright
84.3Bright
94.2Bright
104.2Bright
114.1Bright
124.1Bright
134.0Bright
144.0Bright
154.0Moderate
163.9Moderate
173.9Moderate
183.8Moderate
193.8Moderate
203.7Moderate
213.7Moderate
223.6Moderate
233.6Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.4Moderate
283.4Moderate
293.4Moderate
303.3Moderate
Planning a trip in September

Hazard calendar for Kimitsu

In seasonPeak

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

Kimitsu 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 Kimitsu?

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

6.2
Sightseeing
3rd-best month of the year
5.6
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Kimitsu for sightseeing.

What to pack for Kimitsu in September

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

In September, Kimitsu sees daytime highs around 25°C and nights near 22°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near Kimitsu in September

The nearest coast averages about 25°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 5 to Nov 9 — about 5.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar14Bracing
Apr16Cool
May18Cool
Jun21Refreshing
Jul24Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov20Cool
Dec17Cool

UV index in Kimitsu in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Kimitsu peaks around August 10 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 highExtremeVery highHighModerateAug 10UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Kimitsu 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 Kimitsu is worst in April — around 26 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1525 µg/m³Dec 1612 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb25Moderate
Mar23Moderate
Apr26Moderate
May21Moderate
Jun18Moderate
Jul13Moderate
Aug12Moderate
Sep12Moderate
Oct14Moderate
Nov14Moderate
Dec12Good
Location & terrain

Where is Kimitsu?

Kimitsu sits at 35.4°N, 139.9°E, 4 m above sea level, in Japan. The nearest listed city is Futtsu, 6.0 km away.

Topography around Kimitsu

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

Within 3 km, the terrain around Kimitsu has only modest variations in elevation — a maximum elevation change of 76 m around an average of 7 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 380 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,656 m.

The land around Kimitsu is covered by artificial surfaces (50%) and water (25%) within 3 km, water (54%) and trees (24%) within 16 km, and water (46%), trees (25%) and artificial surfaces (21%) within 80 km.

3 km
76 m
16 km
380 m
80 km
1,656 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Futtsu 6.0 km · Kisarazu 7.0 km · Sodegaura 15 km · Yokosuka 20 km · Kurihama 20 km · Yokohama 22 km · Sugita 23 km · Kawasaki 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 Kimitsu (35.3504°, 139.8703°, elevation 4 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).