Hiji weather in September

In September, Hiji sees average daytime highs of 27°C and overnight lows near 21°C, with 201 mm of rain across 14.2 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 28% 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 Hiji's 8th-clearest and 9th-windiest month. For the whole year in context, see Hiji's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
201 mm
14.2 wet days
Daylight
12 h 12 min
6:02 AM – 6:14 PM
Cloud cover
63%
8th clearest
Wind
7 km/h
9th windiest
Solar energy
4.14 kWh/m²
Travel score
5.7
out of 10

Hiji is town in Hayami district, Ōita prefecture, Japan.

Density
389/km²
people per km²
Founded
1954

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 Hiji 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 4°C cooler than August and about 5°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12923
22923
32923
42923
52923
62823
72822
82822
92822
102822
112822
122822
132722
142721
152721
162721
172721
182621
192620
202620
212620
222620
232620
242520
252519
262519
272519
282519
292519
302519

How September really feels in Hiji

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.

Hiji 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 / 566.50.7102.0
Feb10° / 667.70.810.82.4
Mar13° / 10010.90.111.73.7
Apr18° / 10°11510.5012.85.7
May23° / 15°13010.7013.76.5
Jun26° / 20°27716.2014.25.4
Jul30° / 24°22016.80144.2
Aug30° / 24°18415.7013.24.2
Sep27° / 21°20114.2012.25.7
Oct22° / 16°1348.4011.27.0
Nov17° / 10°717.4010.35.7
Dec12° / 5560.19.83.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24357
34357
44456
54456
64456
74456
84456
94456
104555
114555
124555
134555
144654
154654
164654
174555
184654
194654
204555
214654
224654
234654
244654
254753
264654
274654
284654
294753
304753

Chance of precipitation in September

Any precipitation

Hiji gets around 201 mm of rain over 14.2 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 47% and peaks near 54% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
154
254
354
454
554
653
753
852
952
1051
1150
1249
1349
1448
1547
1646
1746
1845
1944
2044
2143
2242
2342
2441
2541
2640
2740
2839
2939
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 36% of days. Sticky, muggy-or-worse air turns up on roughly 68% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
101624627
201626616
301727605
401828585
501829584
602930554
7021031543
8021131533
9031232503
10031333492
11141533462
12151633442
13161733422
14171832392
15282032371
16292132351
172102231331
183112331311
193122531291
203132630271
214142730251
224152829231
235162929211
245173028190
255183128170
266203127160
276213227140
287223226130
298223225120
309233324100

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 5:52 AM to 6:12 AM, and sunset from 6:35 PM to 5:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:526:35
212.75:536:34
312.75:536:33
412.65:546:31
512.65:556:30
612.65:556:28
712.55:566:27
812.55:576:26
912.45:576:24
1012.45:586:23
1112.45:596:21
1212.35:596:20
1312.36:006:19
1412.36:016:17
1512.26:016:16
1612.26:026:14
1712.26:036:13
1812.16:036:11
1912.16:046:10
2012.16:056:09
2112.06:066:07
2212.06:066:06
2312.06:076:04
2411.96:086:03
2511.96:086:01
2611.86:096:00
2711.86:105:59
2811.86:105:57
2911.76:115:56
3011.76:125:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.14 kWh/m².

For context, solar energy here swings from a low near 2.35 kWh/m² to a high of 5.44 kWh/m² in May across the year — September's 4.14 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.5Bright
44.5Bright
54.5Bright
64.4Bright
74.4Bright
84.4Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.1Bright
204.1Bright
214.0Bright
224.0Bright
234.0Moderate
244.0Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Hiji

In seasonPeak

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

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

Hiji's rainy season runs May–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 Hiji?

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

5.7
Sightseeing
3rd-best month of the year
5.9
Beach & pool
1st-best month of the year

September is a reasonable time to visit Hiji for sightseeing.

What to pack for Hiji in September

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

In September, Hiji sees daytime highs around 27°C and nights near 21°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Hiji 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 32 km away) is warmest in August at about 27°C and coldest in February near 12°C.

It's comfortable for a long swim from Jun 6 to Nov 10 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar12Bracing
Apr14Bracing
May17Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov19Cool
Dec16Cool

UV index in Hiji 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 Hiji peaks around June 20 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJun 20UV 10Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr8Very high
May8Very high
Jun10Extreme
Jul10Very high
Aug10Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Hiji 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 Hiji is worst in March — around 30 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (September, 14 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1829 µg/m³Sep 2214 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar30Moderate
Apr24Moderate
May22Moderate
Jun19Moderate
Jul14Moderate
Aug15Moderate
Sep14Moderate
Oct14Moderate
Nov15Moderate
Dec14Moderate
Location & terrain

Where is Hiji?

Hiji sits at 33.4°N, 131.5°E, 23 m above sea level, in Japan. The nearest listed city is Kitsuki, 10 km away.

Topography around Hiji

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

Within 3 km, the terrain around Hiji has significant variations in elevation — a maximum elevation change of 566 m around an average of 91 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,535 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,799 m.

The land around Hiji is covered by trees (45%) and water (29%) within 3 km, trees (58%) and water (28%) within 16 km, and trees (48%) and water (43%) within 80 km.

3 km
566 m
16 km
1,535 m
80 km
1,799 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Kitsuki 10 km · Beppu 11 km · Ōita 17 km · Tsurusaki 20 km · Bungo-Takada-shi 22 km · Yufu 24 km · Yokkaichi 26 km · Kunisaki 27 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 Hiji (33.3708°, 131.5302°, elevation 23 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).