Mibu weather in September

In September, Mibu sees average daytime highs of 26°C and overnight lows near 19°C, with 239 mm of rain across 17.8 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 16% 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 Mibu's 9th-clearest and 8th-windiest month. For the whole year in context, see Mibu's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
19°
10th coldest
Rainfall
239 mm
17.8 wet days
Daylight
12 h 12 min
5:28 AM – 5:42 PM
Cloud cover
71%
9th clearest
Wind
6 km/h
8th windiest
Solar energy
3.52 kWh/m²
Travel score
5.2
out of 10

Mibu is town in Shimotsuga district, Tochigi prefecture, Japan.

Density
646/km²
people per km²
Founded
1889

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 28°C in the first days to 23°C by the end.

A typical September day in Mibu 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 21°C and 30°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
72721
82720
92720
102720
112720
122620
132620
142619
152619
162619
172519
182518
192518
202518
212518
222418
232417
242417
252417
262417
272317
282316
292316
302316

How September really feels in Mibu

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.

Mibu 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°556.32.59.81.2
Feb / -0°547.12.610.61.6
Mar12° / 11312.62.311.73.0
Apr17° / 13613.40.312.95.0
May22° / 13°17314.9013.95.8
Jun25° / 17°20418.4014.45.2
Jul28° / 21°26221.5014.24.2
Aug29° / 22°20719.6013.44.1
Sep26° / 19°23917.8012.25.2
Oct20° / 13°20614.8011.15.6
Nov15° / 919.2010.14.6
Dec10° / 556.80.69.62.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% 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 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23466
33466
43565
53565
63565
73466
83466
93466
103466
113367
123268
133367
143268
153268
163268
173169
183169
193268
203169
213268
223268
233268
243367
253466
263466
273466
283466
293466
303466

Chance of precipitation in September

Any precipitation

Mibu gets around 239 mm of rain over 17.8 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 60% and peaks near 62% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
162
262
362
462
562
662
762
862
962
1062
1162
1262
1362
1462
1562
1661
1761
1861
1960
2060
2159
2258
2358
2458
2557
2657
2757
2857
2957
3057

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 51% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1031337443
2031438432
3031538422
4041539402
5041639392
6051739381
7061839361
8161939341
9172038331
10182138311
11292237291
122102336271
133112536250
144122635240
155132733210
166142932190
177153031170
188163129150
199173228130
2011193326120
2112203424100
221321352390
231422352170
241623351960
251725361850
261826361640
271927351530
282028351430
292129341320
302330341220

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:16 AM to 5:40 AM, and sunset from 6:05 PM to 5:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:166:05
212.85:176:03
312.75:186:02
412.75:196:00
512.75:195:59
612.65:205:57
712.65:215:56
812.55:225:54
912.55:235:53
1012.55:235:51
1112.45:245:50
1212.45:255:48
1312.35:265:47
1412.35:275:45
1512.35:275:44
1612.25:285:42
1712.25:295:40
1812.15:305:39
1912.15:315:37
2012.15:325:36
2112.05:325:34
2212.05:335:33
2312.05:345:31
2411.95:355:30
2511.95:365:28
2611.85:375:26
2711.85:375:25
2811.85:385:23
2911.75:395:22
3011.75:405:20

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.52 kWh/m².

For context, solar energy here swings from a low near 2.36 kWh/m² to a high of 5.1 kWh/m² in May across the year — September's 3.52 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
43.8Moderate
53.8Moderate
63.8Moderate
73.7Moderate
83.7Moderate
93.7Moderate
103.6Moderate
113.6Moderate
123.6Moderate
133.6Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.3Moderate
223.3Moderate
233.3Moderate
243.3Moderate
253.2Moderate
263.2Moderate
273.2Moderate
283.2Moderate
293.1Moderate
303.1Moderate
Planning a trip in September

Hazard calendar for Mibu

In seasonPeak

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

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

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

Is September a good time to visit Mibu?

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

5.2
Sightseeing
3rd-best month of the year
4.9
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Mibu for sightseeing.

What to pack for Mibu in September

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

In September, Mibu sees daytime highs around 26°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 18 days see rain.

rain gearlight clothes

UV index in Mibu 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 Mibu peaks around July 17 at about 9 (very high) — 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 highModerateJul 17UV 9Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Mibu 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 Mibu is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1721 µg/m³Dec 179 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun16Moderate
Jul14Moderate
Aug13Moderate
Sep11Good
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is Mibu?

Mibu sits at 36.4°N, 139.8°E, 59 m above sea level, in Japan. The nearest listed city is Shimotsuke, 6.0 km away.

Topography around Mibu

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

Within 3 km, the terrain around Mibu has only modest variations in elevation — a maximum elevation change of 46 m around an average of 58 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 588 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,553 m.

The land around Mibu is covered by cropland (48%) and artificial surfaces (27%) within 3 km, cropland (39%), artificial surfaces (30%) and trees (24%) within 16 km, and trees (53%), artificial surfaces (21%) and cropland (20%) within 80 km.

3 km
46 m
16 km
588 m
80 km
2,553 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Shimotsuke 6.0 km · Tochigi 7.0 km · Kaminokawa 11 km · Oyama 13 km · Yūki 15 km · Kanuma 16 km · Utsunomiya 18 km · Mooka 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 Mibu (36.4167°, 139.8°, elevation 59 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. 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).