Hamanoichi weather in September

In September, Hamanoichi sees average daytime highs of 28°C and overnight lows near 21°C, with 202 mm of rain across 15 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 30°C in the first days to 27°C by the end. The sky is clear or mostly clear about 25% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Hamanoichi's 8th-clearest and 11th-windiest month. For the whole year in context, see Hamanoichi's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
202 mm
15 wet days
Daylight
12 h 12 min
6:06 AM – 6:17 PM
Cloud cover
64%
8th clearest
Wind
7 km/h
11th windiest
Solar energy
4.1 kWh/m²
Travel score
5.2
out of 10

Hamanoichi is human settlement in Japan.

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 30°C in the first days to 27°C by the end.

A typical September day in Hamanoichi reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 31°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13023
23023
33023
42923
52923
62923
72922
82922
92922
102922
112922
122922
132922
142921
152821
162821
172821
182821
192821
202820
212820
222720
232720
242720
252720
262719
272719
282719
292619
302619

How September really feels in Hamanoichi

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.

Hamanoichi weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan11° / 808.310.22.8
Feb12° / 102910.83.3
Mar16° / 15712.911.84.6
Apr20° / 11°18111.812.85.9
May24° / 15°20511.713.66.4
Jun26° / 20°48819.9144.8
Jul30° / 24°29919.413.93.9
Aug31° / 24°17418.313.23.8
Sep28° / 21°2021512.25.2
Oct24° / 15°114911.27.1
Nov18° / 1078.210.46.2
Dec13° / 817.1104.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34258
44258
54159
64159
74159
84159
94159
104258
114258
124456
134456
144555
154654
164654
174555
184654
194654
204654
214654
224654
234654
244654
254654
264654
274654
284753
294753
304852

Chance of precipitation in September

Any precipitation

Hamanoichi gets around 202 mm of rain over 15 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 50% and peaks near 60% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
160
260
359
459
559
658
758
857
956
1056
1155
1254
1353
1451
1550
1649
1748
1847
1946
2045
2144
2243
2342
2441
2541
2640
2739
2839
2938
3038

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 42% of days. Sticky, muggy-or-worse air turns up on roughly 76% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1003196414
2003206413
3003216412
4003236311
5014246110
601425619
701526608
802627587
902628577
1012729556
1113830526
12131030515
13141130485
14151231465
15251431444
16261631414
17271731394
18371931373
19382131343
20392231323
21392332302
224102432282
234112532262
244122632242
255132732221
265142832211
275152832191
286162931181
296172931171
307182930161

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 42 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 60 minutes over September. Sunrise moves from 5:56 AM to 6:15 AM, and sunset from 6:37 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:566:37
212.65:576:36
312.65:586:35
412.65:586:33
512.65:596:32
612.55:596:31
712.56:006:29
812.56:016:28
912.46:016:27
1012.46:026:25
1112.46:036:24
1212.36:036:23
1312.36:046:21
1412.36:046:20
1512.26:056:18
1612.26:066:17
1712.26:066:16
1812.16:076:14
1912.16:086:13
2012.16:086:12
2112.06:096:10
2212.06:096:09
2312.06:106:08
2411.96:116:06
2511.96:116:05
2611.96:126:04
2711.86:136:02
2811.86:136:01
2911.86:145:59
3011.76:155:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.1 kWh/m².

For context, solar energy here swings from a low near 2.57 kWh/m² to a high of 5 kWh/m² in May across the year — September's 4.1 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.1Bright
204.1Bright
214.0Bright
224.0Bright
234.0Bright
244.0Moderate
254.0Moderate
264.0Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Hamanoichi

In seasonPeak

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

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

Hamanoichi's rainy season runs June–July, 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 Hamanoichi?

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

5.2
Sightseeing
5th-best month of the year
6.0
Beach & pool
1st-best month of the year

September is a reasonable time to visit Hamanoichi for sightseeing.

What to pack for Hamanoichi in September

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

In September, Hamanoichi sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. About 15 days see rain.

light clothesrain gear

Sea temperature near Hamanoichi in September

The nearest coast averages about 27°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 39 km away) is warmest in August at about 28°C and coldest in February near 18°C.

It's comfortable for a long swim from Apr 24 to Dec 26 — about 8.1 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan19Cool
Feb18Cool
Mar18Cool
Apr20Cool
May21Refreshing
Jun24Refreshing
Jul27Warm
Aug28Tropical
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec21Refreshing

UV index in Hamanoichi in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hamanoichi peaks around June 23 at about 11 (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 — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 11Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar7High
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Hamanoichi 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 Hamanoichi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1423 µg/m³Oct 1012 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb19Moderate
Mar22Moderate
Apr23Moderate
May21Moderate
Jun17Moderate
Jul12Moderate
Aug14Moderate
Sep12Moderate
Oct12Moderate
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Hamanoichi?

Hamanoichi sits at 31.7°N, 130.7°E, -1 m above sea level, in Japan. The nearest listed city is Kokubu-matsuki, 4.0 km away.

Topography around Hamanoichi

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

Within 3 km, the terrain around Hamanoichi has only modest variations in elevation — a maximum elevation change of 146 m around an average of 6 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,097 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,680 m.

The land around Hamanoichi is covered by water (48%) and artificial surfaces (27%) within 3 km, trees (56%) and water (29%) within 16 km, and trees (54%) and water (38%) within 80 km.

3 km
146 m
16 km
1,097 m
80 km
1,680 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kokubu-matsuki 4.0 km · Kirishima 4.0 km · Kajiki 7.0 km · Aira 15 km · Kagoshima 24 km · Soo 26 km · Tarumizu 26 km · Sueyoshichō-ninokata 28 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 Hamanoichi (31.7167°, 130.7333°, 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).