Mitoyo weather in September

In September, Mitoyo sees average daytime highs of 27°C and overnight lows near 22°C, with 168 mm of rain across 11.6 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 33% 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 Mitoyo's 9th-clearest and 8th-windiest month. For the whole year in context, see Mitoyo's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
168 mm
11.6 wet days
Daylight
12 h 12 min
5:53 AM – 6:06 PM
Cloud cover
60%
9th clearest
Wind
9 km/h
8th windiest
Solar energy
4.1 kWh/m²
Travel score
6.1
out of 10

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 Mitoyo reaches about 27°C in the afternoon and slips back to 22°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 29°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12924
22924
32924
42924
52924
62824
72824
82823
92823
102823
112823
122723
132723
142723
152722
162722
172722
182622
192622
202622
212621
222621
232621
242521
252521
262520
272520
282520
292520
302420

How September really feels in Mitoyo

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.

Mitoyo 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 / 599.91.6101.9
Feb10° / 649.51.510.72.2
Mar13° / 10211.50.311.73.5
Apr18° / 12°11010.6012.85.6
May22° / 16°13010.3013.86.5
Jun25° / 20°19113014.26.0
Jul29° / 24°17712.5014.15.2
Aug30° / 25°1069.7013.35.0
Sep27° / 22°16811.6012.26.1
Oct22° / 17°1349.5011.16.9
Nov17° / 11°688.1010.25.5
Dec12° / 6710.119.83.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% 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 50%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
35050
45050
55050
64951
74951
84951
94951
104951
114951
124951
134951
144951
155050
164951
174951
184951
194951
204852
214951
224951
234951
244951
255050
265050
275149
285149
295149
305248

Chance of precipitation in September

Any precipitation

Mitoyo gets around 168 mm of rain over 11.6 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 38% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
338
438
538
638
738
839
939
1039
1138
1238
1338
1438
1537
1637
1737
1837
1937
2037
2138
2238
2338
2438
2538
2638
2738
2838
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 31% of days. Sticky, muggy-or-worse air turns up on roughly 64% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1017265511
2018285310
3019295110
401930519
5011030518
6021131487
7021232477
8031332456
9131433446
10141533425
11151733405
12151833384
13261933364
14272033343
15292232323
163102332303
173112431282
184122531262
194132630242
205142729222
216152829202
226172928191
237183027171
247193127161
258203126141
269213225131
279223324111
2810233323101
291123342290
301224332190

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 5:43 AM to 6:04 AM, and sunset from 6:27 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:436:27
212.75:436:26
312.75:446:25
412.65:456:23
512.65:456:22
612.65:466:20
712.55:476:19
812.55:486:18
912.55:486:16
1012.45:496:15
1112.45:506:13
1212.45:506:12
1312.35:516:10
1412.35:526:09
1512.25:536:07
1612.25:536:06
1712.25:546:04
1812.15:556:03
1912.15:556:02
2012.15:566:00
2112.05:575:59
2212.05:585:57
2312.05:585:56
2411.95:595:54
2511.96:005:53
2611.86:015:51
2711.86:015:50
2811.86:025:48
2911.76:035:47
3011.76:045:46

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 2.35 kWh/m² to a high of 5.54 kWh/m² in May across the year — September's 4.1 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
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.0Bright
204.0Bright
214.0Moderate
224.0Moderate
233.9Moderate
243.9Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Mitoyo

In seasonPeak

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

Mitoyo 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 Mitoyo?

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

6.1
Sightseeing
3rd-best month of the year
6.3
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Mitoyo for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Mitoyo in September

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

In September, Mitoyo sees daytime highs around 27°C and nights near 22°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Mitoyo 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 offshore is warmest in August at about 28°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 3 to Nov 12 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May18Cool
Jun22Refreshing
Jul25Warm
Aug28Warm
Sep27Warm
Oct24Refreshing
Nov20Cool
Dec16Cool

UV index in Mitoyo 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 Mitoyo peaks around July 12 at about 10 (very high) — 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 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 12UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Mitoyo 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 Mitoyo is worst in April — around 24 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1324 µg/m³Dec 1414 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr24Moderate
May22Moderate
Jun20Moderate
Jul17Moderate
Aug17Moderate
Sep16Moderate
Oct14Moderate
Nov15Moderate
Dec14Moderate
Location & terrain

Where is Mitoyo?

Mitoyo sits at 34.2°N, 133.7°E, 67 m above sea level, in Japan. The nearest listed city is Kan’onjichō, 10 km away.

Topography around Mitoyo

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

Within 3 km, the terrain around Mitoyo has significant variations in elevation — a maximum elevation change of 428 m around an average of 50 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 615 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,914 m.

The land around Mitoyo is covered by trees (45%) and artificial surfaces (30%) within 3 km, water (52%) and trees (22%) within 16 km, and trees (62%) and water (26%) within 80 km.

3 km
428 m
16 km
615 m
80 km
1,914 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kan’onjichō 10 km · Zentsujichó 10 km · Tadotsu 10 km · Marugame 13 km · Utazu 16 km · Shioiri 17 km · Sakaidechō 19 km · Takinomiya 23 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 Mitoyo (34.2105°, 133.6746°, elevation 67 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).