Mima weather in September

In September, Mima sees average daytime highs of 26°C and overnight lows near 20°C, with 289 mm of rain across 16 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 24°C by the end. The sky is clear or mostly clear about 27% of the time in September, and the air most often feels muggy.

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 Mima's 9th-clearest and 9th-windiest month. For the whole year in context, see Mima's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
289 mm
16 wet days
Daylight
12 h 12 min
5:51 AM – 6:04 PM
Cloud cover
65%
9th clearest
Wind
7 km/h
9th windiest
Solar energy
4.09 kWh/m²
Travel score
5.5
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 24°C by the end.

A typical September day in Mima reaches about 26°C in the afternoon and slips back to 20°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 23°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)
12922
22822
32822
42822
52822
62821
72821
82821
92721
102721
112721
122721
132720
142720
152620
162620
172620
182619
192619
202519
212519
222519
232519
242518
252518
262418
272418
282418
292417
302417

How September really feels in Mima

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.

Mima weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 687.61.7101.6
Feb / 778.4210.71.9
Mar13° / 12712.10.511.73.4
Apr18° / 14911.8012.85.5
May22° / 14°18713.1013.76.1
Jun25° / 18°27917.5014.25.3
Jul29° / 23°275190144.3
Aug30° / 23°22217.8013.34.2
Sep26° / 20°28916012.25.5
Oct21° / 14°21812.2011.16.3
Nov16° / 1008.7010.25.2
Dec11° / 797.40.69.82.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24258
34258
44258
54159
64159
74159
84159
94159
104060
114060
124060
134060
144258
154258
164258
174159
184159
194159
204258
214258
224258
234357
244357
254258
264258
274258
284357
294357
304357

Chance of precipitation in September

Any precipitation

Mima gets around 289 mm of rain over 16 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 54% and peaks near 59% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
159
258
358
458
558
658
758
858
957
1057
1157
1256
1356
1455
1554
1653
1753
1852
1951
2051
2150
2250
2349
2449
2549
2649
2749
2849
2949
3049

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 54% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
103133252
204143350
304153348
404163346
505173444
616183442
716183440
817193538
918203536
1028213534
1129223532
12310233430
13312233428
14413243326
15514253224
16615263123
17616263021
18718272919
19819272818
20920282716
211021282615
221123282513
231224292312
241325292211
251525292110
26162630209
27172730198
28182730187
29202730176
30212829175

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 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
16calm
26calm
36calm
46calm
56calm
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 5:41 AM to 6:02 AM, and sunset from 6:25 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:416:25
212.75:426:24
312.75:426:23
412.65:436:21
512.65:446:20
612.65:446:18
712.55:456:17
812.55:466:16
912.55:476:14
1012.45:476:13
1112.45:486:11
1212.45:496:10
1312.35:496:08
1412.35:506:07
1512.25:516:05
1612.25:516:04
1712.25:526:03
1812.15:536:01
1912.15:546:00
2012.15:545:58
2112.05:555:57
2212.05:565:55
2312.05:575:54
2411.95:575:52
2511.95:585:51
2611.85:595:49
2711.85:595:48
2811.86:005:47
2911.76:015:45
3011.76:025:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.09 kWh/m².

For context, solar energy here swings from a low near 2.5 kWh/m² to a high of 5.52 kWh/m² in May across the year — September's 4.09 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.5Bright
54.5Bright
64.5Bright
74.4Bright
84.4Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.1Bright
184.0Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.9Moderate
253.8Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Mima

In seasonPeak

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

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

Mima's rainy season runs April–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 Mima?

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

5.5
Sightseeing
3rd-best month of the year
5.4
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Mima for sightseeing.

What to pack for Mima in September

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

In September, Mima sees daytime highs around 26°C and nights near 20°C. Pack rain gear. Worth having: light clothes. About 16 days see rain.

rain gearlight clothes

Sea temperature near Mima 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 42 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 13 — about 5.3 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov20Cool
Dec17Cool

UV index in Mima 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 Mima peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 23UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May9Very high
Jun11Extreme
Jul10Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Mima 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 Mima is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (September, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1320 µg/m³Sep 2010 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar19Moderate
Apr20Moderate
May18Moderate
Jun15Moderate
Jul11Good
Aug11Good
Sep10Good
Oct10Good
Nov11Good
Dec11Good
Location & terrain

Where is Mima?

Mima sits at 34.1°N, 134.1°E, 45 m above sea level, in Japan. The nearest listed city is Wakimachi, 2.0 km away.

Topography around Mima

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

Within 3 km, the terrain around Mima has large variations in elevation — a maximum elevation change of 636 m around an average of 169 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,285 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,946 m.

The land around Mima is covered by trees (63%) within 3 km, trees (88%) within 16 km, and trees (46%) and water (44%) within 80 km.

3 km
636 m
16 km
1,285 m
80 km
1,946 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Wakimachi 2.0 km · Awa 14 km · Yoshinogawa 14 km · Kamojimachō-jōgejima 19 km · Hiragi 24 km · Higashikagawa 25 km · Ishii 28 km · Shioiri 29 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 Mima (34.0549°, 134.1396°, elevation 45 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).