Hatsukaichi weather in September

In September, Hatsukaichi sees average daytime highs of 27°C and overnight lows near 21°C, with 185 mm of rain across 11.7 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 31% 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 Hatsukaichi's 8th-clearest and 8th-windiest month. For the whole year in context, see Hatsukaichi's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
185 mm
11.7 wet days
Daylight
12 h 12 min
5:59 AM – 6:11 PM
Cloud cover
61%
8th clearest
Wind
9 km/h
8th windiest
Solar energy
4.25 kWh/m²
Travel score
6.1
out of 10

Hatsukaichi is city in Hiroshima prefecture, Japan.

Density
233/km²
people per km²
Founded
1988

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 Hatsukaichi reaches about 27°C in the afternoon and slips back to 21°C overnight — a 6°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 3°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12923
22923
32923
42923
52822
62822
72822
82822
92822
102822
112821
122721
132721
142721
152721
162721
172720
182720
192620
202620
212620
222619
232619
242619
252519
262519
272518
282518
292518
302518

How September really feels in Hatsukaichi

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.

Hatsukaichi 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 / 506.21101.8
Feb10° / 677.81.510.72.1
Mar13° / 11610.10.511.73.7
Apr18° / 10°1389.8012.85.8
May22° / 15°15810.3013.86.6
Jun25° / 19°23413.9014.35.9
Jul29° / 23°25515.2014.14.8
Aug30° / 24°16914.4013.34.5
Sep27° / 21°18511.7012.26.1
Oct22° / 15°1168011.17.1
Nov16° / 727.2010.25.6
Dec11° / 606.70.39.73.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24654
34654
44555
54654
64654
74654
84753
94753
104852
114852
124852
134852
144951
154951
164951
174852
184951
194951
204951
214951
225050
234951
244951
254951
264951
275050
285050
295050
305050

Chance of precipitation in September

Any precipitation

Hatsukaichi gets around 185 mm of rain over 11.7 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 39% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
145
245
344
444
543
643
743
843
942
1042
1142
1241
1341
1440
1539
1639
1738
1838
1937
2037
2136
2236
2335
2435
2534
2634
2733
2833
2933
3033

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 29% 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 (%)
1011028556
2011129545
3011230525
4021331504
5021432484
6031533463
7031633443
8041834423
9051934402
10162034372
11172134352
12182234332
13292334311
142102433291
153122532271
163132632251
174142731231
185152730221
195172829201
206182928180
217193027170
228203026150
238213125140
249223224130
2510243223120
2611253321100
271225332090
281326331980
291427331870
301528331770

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
58calm
68calm
78calm
88calm
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 5:48 AM to 6:09 AM, and sunset from 6:33 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:486:33
212.75:496:32
312.75:496:30
412.65:506:29
512.65:516:27
612.65:516:26
712.55:526:24
812.55:536:23
912.55:546:22
1012.45:546:20
1112.45:556:19
1212.45:566:17
1312.35:566:16
1412.35:576:14
1512.25:586:13
1612.25:596:11
1712.25:596:10
1812.16:006:08
1912.16:016:07
2012.16:026:05
2112.06:026:04
2212.06:036:02
2312.06:046:01
2411.96:056:00
2511.96:055:58
2611.86:065:57
2711.86:075:55
2811.86:085:54
2911.76:085:52
3011.76:095:51

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 2.27 kWh/m² to a high of 5.55 kWh/m² in May across the year — September's 4.25 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.1Bright
254.0Bright
264.0Bright
274.0Bright
284.0Moderate
294.0Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Hatsukaichi

In seasonPeak

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

Hatsukaichi sits in the Pacific typhoon belt; the season peaks July–October.

Hatsukaichi's rainy season runs March–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Hatsukaichi?

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

6.1
Sightseeing
3rd-best month of the year
6.3
Beach & pool
1st-best month of the year

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

What to pack for Hatsukaichi in September

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

In September, Hatsukaichi sees daytime highs around 27°C and nights near 21°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Hatsukaichi 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 at the nearest coast (about 25 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 13 to Nov 17 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun20Refreshing
Jul24Warm
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Hatsukaichi 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 Hatsukaichi peaks around July 13 at about 10 (extreme) — 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 highVery highModerateJul 13UV 10Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Hatsukaichi 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 Hatsukaichi is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1022 µg/m³Oct 1310 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar22Moderate
Apr22Moderate
May20Moderate
Jun17Moderate
Jul13Moderate
Aug12Moderate
Sep11Good
Oct10Good
Nov12Moderate
Dec12Good
Location & terrain

Where is Hatsukaichi?

Hatsukaichi sits at 34.4°N, 132.3°E, 4 m above sea level, in Japan. The nearest listed city is Miyajima, 6.0 km away.

Topography around Hatsukaichi

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

Within 3 km, the terrain around Hatsukaichi has significant variations in elevation — a maximum elevation change of 352 m around an average of 34 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,036 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,327 m.

The land around Hatsukaichi is covered by artificial surfaces (44%), water (33%) and trees (21%) within 3 km, trees (53%) and water (29%) within 16 km, and trees (61%) and water (32%) within 80 km.

3 km
352 m
16 km
1,036 m
80 km
1,327 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Miyajima 6.0 km · Ōno-hara 10 km · Hiroshima 12 km · Gion 15 km · Fuchū 17 km · Etajima 18 km · Kaitaichi 18 km · Ōtake 19 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 Hatsukaichi (34.35°, 132.3333°, 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).