Obanazawa weather in September

In September, Obanazawa sees average daytime highs of 23°C and overnight lows near 16°C, with 144 mm of rain across 14.2 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 21°C by the end. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Obanazawa's 10th-clearest and 9th-windiest month. For the whole year in context, see Obanazawa's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
144 mm
14.2 wet days
Daylight
12 h 12 min
5:25 AM – 5:40 PM
Cloud cover
72%
10th clearest
Wind
7 km/h
9th windiest
Solar energy
3.5 kWh/m²
Travel score
5.8
out of 10

Obanazawa is city in Yamagata Prefecture, Japan.

Density
56/km²
people per km²
Founded
1959

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 25°C in the first days to 21°C by the end.

A typical September day in Obanazawa reaches about 23°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12619
22619
32519
42519
52518
62518
72518
82518
92518
102418
112417
122417
132417
142417
152316
162316
172316
182316
192315
202215
212215
222215
232214
242214
252114
262114
272114
282113
292113
302013

How September really feels in Obanazawa

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.

Obanazawa 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 / -4°9517.919.99.60.0
Feb / -4°6915.115.210.50.0
Mar / -1°9814.99.511.70.8
Apr14° / 9513.12133.6
May19° / 10°10012014.15.7
Jun22° / 15°12312.5014.65.9
Jul26° / 19°18817.2014.45.4
Aug27° / 20°15815.5013.55.5
Sep23° / 16°14414.2012.35.8
Oct17° / 12612.80115.1
Nov11° / 8414.12.79.92.5
Dec / -1°9517.613.39.40.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% 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 68%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13070
23169
33169
43169
53169
63169
73169
83169
93070
103169
113169
123169
133169
143268
153169
163169
173169
183268
193268
203268
213268
223268
233268
243268
253367
263367
273466
283466
293466
303466

Chance of precipitation in September

Any precipitation

Obanazawa gets around 144 mm of rain over 14.2 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 48% and peaks near 52% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
151
252
352
452
552
652
752
852
952
1052
1151
1251
1351
1450
1550
1649
1748
1848
1947
2046
2145
2245
2344
2444
2544
2644
2744
2844
2944
3044

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the humid band about 27% of days. Sticky, muggy-or-worse air turns up on roughly 30% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10122837221
21122937211
31133037191
41143037180
51153036170
62163136160
72173135150
83193134140
94203133130
105213131120
116223130110
127233128100
13924312790
141125312580
151326302380
161527302170
171728291960
181929291850
192230281640
202431271440
212731261330
222932251130
233132241020
24343323820
25363322720
26383421610
27403420510
28423418410
29453417400
30473415300

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 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
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
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:12 AM to 5:38 AM, and sunset from 6:05 PM to 5:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:126:05
212.85:136:03
312.85:146:01
412.85:146:00
512.75:155:58
612.75:165:57
712.65:175:55
812.65:185:53
912.55:195:52
1012.55:205:50
1112.55:215:48
1212.45:225:47
1312.45:235:45
1412.35:235:43
1512.35:245:42
1612.25:255:40
1712.25:265:38
1812.25:275:37
1912.15:285:35
2012.15:295:33
2112.05:305:32
2212.05:315:30
2311.95:325:29
2411.95:335:27
2511.95:345:25
2611.85:355:24
2711.85:355:22
2811.75:365:20
2911.75:375:19
3011.65:385:17

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.5 kWh/m².

For context, solar energy here swings from a low near 1.87 kWh/m² to a high of 5.27 kWh/m² in May across the year — September's 3.5 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.7Moderate
43.7Moderate
53.7Moderate
63.7Moderate
73.6Moderate
83.6Moderate
93.6Moderate
103.6Moderate
113.5Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.4Moderate
223.4Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Hazard calendar for Obanazawa

In seasonPeak

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

Obanazawa 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 Obanazawa?

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

5.8
Sightseeing
2nd-best month of the year
4.5
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Obanazawa for sightseeing.

What to pack for Obanazawa in September

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

In September, Obanazawa sees daytime highs around 23°C and nights near 16°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Obanazawa in September

The nearest coast averages about 25°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 26°C and coldest in March near 9°C.

It's comfortable for a long swim from Jun 24 to Oct 27 — about 4.1 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb10Bracing
Mar9Bracing
Apr10Bracing
May14Bracing
Jun19Cool
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct21Refreshing
Nov18Cool
Dec15Bracing

UV index in Obanazawa in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Obanazawa peaks around August 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 18UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul7High
Aug9Very high
Sep8Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Obanazawa 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 Obanazawa is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1622 µg/m³Dec 1710 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun16Moderate
Jul14Moderate
Aug12Moderate
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Obanazawa?

Obanazawa sits at 38.6°N, 140.4°E, 93 m above sea level, in Japan. The nearest listed city is Murayama, 15 km away.

Topography around Obanazawa

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

Within 3 km, the terrain around Obanazawa has only modest variations in elevation — a maximum elevation change of 226 m around an average of 102 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,175 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,215 m.

The land around Obanazawa is covered by cropland (41%) and trees (32%) within 3 km, trees (78%) within 16 km, and trees (71%) within 80 km.

3 km
226 m
16 km
1,175 m
80 km
2,215 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Murayama 15 km · Higashine 18 km · Shinjō 19 km · Yachi 22 km · Tendō 28 km · Sagae 28 km · Naka-niida 39 km · Yamagata 41 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 Obanazawa (38.6033°, 140.4019°, elevation 93 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).