Yamagata weather in September

In September, Yamagata sees average daytime highs of 27°C and overnight lows near 19°C, with 291 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 29°C in the first days to 25°C by the end. The sky is clear or mostly clear about 30% 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 Yamagata's 9th-clearest and 9th-windiest month. For the whole year in context, see Yamagata's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
19°
10th coldest
Rainfall
291 mm
14.6 wet days
Daylight
12 h 12 min
5:41 AM – 5:54 PM
Cloud cover
62%
9th clearest
Wind
7 km/h
9th windiest
Solar energy
4.02 kWh/m²
Travel score
5.7
out of 10

Yamagata is city in Gifu Prefecture, Japan.

Density
123/km²
people per km²
Founded
2003

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 Yamagata reaches about 27°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 23°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)
12922
22922
32921
42921
52821
62821
72821
82821
92821
102820
112820
122720
132720
142720
152720
162719
172719
182619
192619
202619
212618
222618
232518
242518
252518
262517
272517
282517
292417
302417

How September really feels in Yamagata

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.

Yamagata 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 / 789.74.49.91.0
Feb / 829.13.510.71.5
Mar12° / 15711.90.811.73.2
Apr18° / 18612.30.112.95.3
May22° / 13°21613.1013.86.2
Jun25° / 18°27515.6014.35.6
Jul29° / 22°37219.5014.24.3
Aug30° / 23°22815.7013.34.2
Sep27° / 19°29114.6012.25.7
Oct21° / 13°20211.7011.16.4
Nov15° / 1209.3010.14.9
Dec10° / 8610.32.39.62.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% 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 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14456
24555
34555
44555
54555
64555
74456
84555
94456
104456
114555
124555
134456
144456
154456
164456
174357
184357
194357
204258
214357
224357
234456
244456
254456
264456
274555
284555
294555
304555

Chance of precipitation in September

Any precipitation

Yamagata gets around 291 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 53% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
152
253
353
453
553
653
753
853
952
1052
1151
1251
1350
1449
1549
1648
1747
1847
1946
2046
2146
2246
2345
2445
2545
2645
2745
2845
2945
3045

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 52% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1031534462
2031635442
3141635431
4141736421
5151836401
6151836381
7161937371
8262037351
9272137330
10282237320
11392236300
12392336280
134102435260
145112634240
155132733220
166142832200
177152831180
188162930170
199183029150
2010193028130
2111203126120
2212223125100
231423312490
241524312280
251625312160
261727321960
271828321850
281929311640
292030311530
302231311430

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
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 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 5:29 AM to 5:52 AM, and sunset from 6:16 PM to 5:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:296:16
212.75:306:15
312.75:316:13
412.75:316:12
512.65:326:10
612.65:336:09
712.65:346:07
812.55:346:06
912.55:356:04
1012.45:366:03
1112.45:376:01
1212.45:386:00
1312.35:385:58
1412.35:395:57
1512.35:405:55
1612.25:415:54
1712.25:415:52
1812.15:425:51
1912.15:435:49
2012.15:445:48
2112.05:455:46
2212.05:455:45
2312.05:465:43
2411.95:475:42
2511.95:485:40
2611.85:485:39
2711.85:495:37
2811.85:505:36
2911.75:515:34
3011.75:525:33

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 2.34 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.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.4Bright
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
223.9Moderate
233.8Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Yamagata

In seasonPeak

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

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

Yamagata'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 Yamagata?

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
5.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Yamagata for sightseeing.

What to pack for Yamagata in September

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

In September, Yamagata sees daytime highs around 27°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Yamagata 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 68 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 May 31 to Nov 9 — 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
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Yamagata 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 Yamagata peaks around July 15 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 highVery highModerateJul 15UV 10Jan 1UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Yamagata 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 Yamagata 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 Yamagata?

Yamagata sits at 35.5°N, 136.8°E, 156 m above sea level, in Japan. The nearest listed city is Gifu, 6.0 km away.

Topography around Yamagata

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

Within 3 km, the terrain around Yamagata has significant variations in elevation — a maximum elevation change of 397 m around an average of 83 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 689 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,037 m.

The land around Yamagata is covered by trees (60%) and artificial surfaces (30%) within 3 km, trees (48%) and artificial surfaces (33%) within 16 km, and trees (70%) within 80 km.

3 km
397 m
16 km
689 m
80 km
3,037 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Gifu 6.0 km · Motosu 9.0 km · Kitagata 9.0 km · Ginan 10 km · Kakamigahara 11 km · Kasamatsuchō 12 km · Kurono 13 km · Mizuho 13 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 Yamagata (35.4762°, 136.7721°, elevation 156 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).