Ibi weather in September

In September, Ibi sees average daytime highs of 26°C and overnight lows near 19°C, with 276 mm of rain across 14.6 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 28°C in the first days to 23°C by the end. The sky is clear or mostly clear about 28% 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 Ibi's 9th-clearest and 9th-windiest month. For the whole year in context, see Ibi's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
19°
10th coldest
Rainfall
276 mm
14.6 wet days
Daylight
12 h 12 min
5:41 AM – 5:55 PM
Cloud cover
64%
9th clearest
Wind
8 km/h
9th windiest
Solar energy
4.02 kWh/m²
Travel score
5.9
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 28°C in the first days to 23°C by the end.

A typical September day in Ibi reaches about 26°C in the afternoon and slips back to 19°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 29°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12821
22821
32821
42821
52721
62721
72720
82720
92720
102720
112720
122620
132619
142619
152619
162619
172619
182518
192518
202518
212518
222518
232417
242417
252417
262417
272417
282417
292316
302316

How September really feels in Ibi

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.

Ibi 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 / -1°9414.399.90.3
Feb / -0°9212.37.510.70.7
Mar11° / 15713.73.111.72.5
Apr16° / 18012.80.212.94.8
May21° / 13°21213.2013.86.0
Jun24° / 17°27015.9014.45.6
Jul28° / 22°36119.7014.24.5
Aug29° / 23°22316.7013.34.5
Sep26° / 19°27614.6012.25.9
Oct20° / 13°19312011.16.2
Nov14° / 118110.110.14.2
Dec / 9913.95.19.61.5

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 14% of September, with mostly cloudy or overcast conditions the remaining 57%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24258
34258
44357
54357
64258
74258
84258
94258
104357
114357
124258
134357
144357
154357
164258
174357
184258
194159
204258
214258
224258
234159
244258
254258
264258
274357
284357
294456
304456

Chance of precipitation in September

Any precipitation

Ibi gets around 276 mm of rain over 14.6 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 49% and peaks near 54% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
153
253
353
454
554
653
753
853
953
1053
1152
1251
1351
1450
1549
1648
1747
1847
1946
2046
2145
2245
2345
2445
2545
2645
2745
2845
2945
3044

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 50% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1031537432
2031637421
3131737411
4141838391
5141938371
6152038361
7152138341
8162238320
9272338300
10282438280
11292537260
123102636250
133112736230
144122835210
155132934190
165153033170
176163132150
187183130140
198193229120
209213228110
211122322690
221223322580
231325322370
241426322260
251627322050
261729311850
271830311740
282031311530
292131301430
302332301320

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 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
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 5:53 AM, and sunset from 6:17 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:306:17
212.75:316:16
312.75:316:14
412.75:326:13
512.65:336:11
612.65:346:10
712.65:356:08
812.55:356:07
912.55:366:05
1012.45:376:04
1112.45:386:02
1212.45:386:01
1312.35:395:59
1412.35:405:58
1512.35:415:56
1612.25:415:55
1712.25:425:53
1812.15:435:52
1912.15:445:50
2012.15:455:49
2112.05:455:47
2212.05:465:46
2312.05:475:44
2411.95:485:43
2511.95:485:41
2611.85:495:40
2711.85:505:38
2811.85:515:37
2911.75:525:35
3011.75:535:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.02 kWh/m².

For context, solar energy here swings from a low near 2.28 kWh/m² to a high of 5.37 kWh/m² in May across the year — September's 4.02 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.4Bright
44.4Bright
54.3Bright
64.3Bright
74.3Bright
84.2Bright
94.2Bright
104.2Bright
114.1Bright
124.1Bright
134.1Bright
144.0Bright
154.0Bright
164.0Moderate
174.0Moderate
183.9Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.8Moderate
233.8Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Ibi

In seasonPeak

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

Ibi 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 Ibi?

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

5.9
Sightseeing
3rd-best month of the year
5.5
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Ibi for sightseeing.

What to pack for Ibi in September

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

In September, Ibi sees daytime highs around 26°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Ibi 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 65 km away) is warmest in August at about 27°C and coldest in March near 11°C.

It's comfortable for a long swim from Jun 12 to Nov 7 — about 4.9 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar11Bracing
Apr13Bracing
May17Cool
Jun21Refreshing
Jul24Warm
Aug27Warm
Sep26Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Ibi 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 Ibi peaks around July 15 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 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 highVery highModerateJul 15UV 10Jan 10UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Ibi 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 Ibi 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 Ibi?

Ibi sits at 35.5°N, 136.6°E, 29 m above sea level, in Japan. The nearest listed city is Ikeno, 6.0 km away.

Topography around Ibi

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

Within 3 km, the terrain around Ibi has significant variations in elevation — a maximum elevation change of 319 m around an average of 70 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,362 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,672 m.

The land around Ibi is covered by trees (34%), cropland (33%) and artificial surfaces (27%) within 3 km, trees (68%) within 16 km, and trees (65%) within 80 km.

3 km
319 m
16 km
1,362 m
80 km
2,672 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Ikeno 6.0 km · Kurono 6.0 km · Gōdo 8.0 km · Motosu 10 km · Kitagata 12 km · Tarui 13 km · Mizuho 14 km · Ōgaki 15 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 Ibi (35.4833°, 136.5667°, elevation 29 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).