Gosen weather in September

In September, Gosen sees average daytime highs of 25°C and overnight lows near 17°C, with 176 mm of rain across 16.2 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 22°C by the end. The sky is clear or mostly clear about 20% 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 42 min by month's end. Set against the rest of the year, September is Gosen's 6th-clearest and 9th-windiest month. For the whole year in context, see Gosen's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
176 mm
16.2 wet days
Daylight
12 h 12 min
5:30 AM – 5:45 PM
Cloud cover
68%
6th clearest
Wind
7 km/h
9th windiest
Solar energy
3.88 kWh/m²
Travel score
5.6
out of 10

Gosen is city in Niigata prefecture, Japan.

Density
138/km²
people per km²
Founded
1954

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 27°C in the first days to 22°C by the end.

A typical September day in Gosen reaches about 25°C in the afternoon and slips back to 17°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 29°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12820
22820
32720
42720
52720
62719
72719
82719
92619
102619
112619
122618
132618
142518
152518
162517
172517
182517
192417
202416
212416
222416
232316
242315
252315
262315
272315
282215
292214
302214

How September really feels in Gosen

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.

Gosen weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°19926.122.69.70.0
Feb / -2°1442218.510.50.0
Mar / 15621.211.611.71.0
Apr15° / 12915.91.712.93.8
May21° / 11°14014.30145.7
Jun24° / 16°18215014.65.8
Jul28° / 21°31119.8014.34.7
Aug29° / 22°21517.8013.54.5
Sep25° / 17°17616.2012.35.6
Oct19° / 11°16916.70115.1
Nov12° / 16719.32102.6
Dec / 20524.614.69.40.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34159
44159
54159
64159
74258
84159
94159
104159
113961
124060
133961
143862
153961
163763
173862
183763
193664
203664
213664
223664
233664
243664
253664
263664
273664
283565
293565
303565

Chance of precipitation in September

Any precipitation

Gosen gets around 176 mm of rain over 16.2 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 55% and peaks near 58% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
158
258
358
458
558
658
757
857
957
1057
1157
1256
1356
1455
1555
1654
1754
1853
1953
2053
2152
2252
2352
2452
2552
2653
2753
2854
2954
3055

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 29% of days. Sticky, muggy-or-worse air turns up on roughly 41% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1042143311
2042243291
3052343271
4152443261
5162543241
6172643231
7182742211
8192842201
92102941180
102113040170
113123039160
124143137150
135153136130
146173134120
157183232110
168203230100
171021322880
181123322670
191325322460
201426322250
211628322040
221829311840
232030311630
242232301420
252333291320
262534291120
272735281010
28283627810
29303725710
30323724600

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
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 54 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 72 minutes over September. Sunrise moves from 5:17 AM to 5:43 AM, and sunset from 6:09 PM to 5:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:176:09
212.85:186:07
312.85:196:06
412.75:206:04
512.75:216:02
612.75:226:01
712.65:235:59
812.65:245:58
912.55:245:56
1012.55:255:54
1112.45:265:53
1212.45:275:51
1312.45:285:50
1412.35:295:48
1512.35:305:46
1612.25:305:45
1712.25:315:43
1812.25:325:42
1912.15:335:40
2012.15:345:38
2112.05:355:37
2212.05:365:35
2311.95:375:34
2411.95:385:32
2511.95:385:30
2611.85:395:29
2711.85:405:27
2811.75:415:26
2911.75:425:24
3011.75:435:22

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.88 kWh/m².

For context, solar energy here swings from a low near 1.68 kWh/m² to a high of 5.51 kWh/m² in May across the year — September's 3.88 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.3Bright
44.3Bright
54.2Bright
64.2Bright
74.2Bright
84.1Bright
94.1Bright
104.0Bright
114.0Bright
124.0Moderate
133.9Moderate
143.9Moderate
153.9Moderate
163.8Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.7Moderate
213.7Moderate
223.6Moderate
233.6Moderate
243.6Moderate
253.6Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.4Moderate
303.4Moderate
Planning a trip in September

Hazard calendar for Gosen

In seasonPeak

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

Gosen 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 Gosen?

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

5.6
Sightseeing
3rd-best month of the year
4.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Gosen for sightseeing.

What to pack for Gosen in September

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

In September, Gosen sees daytime highs around 25°C and nights near 17°C. Pack rain gear. Worth having: light clothes. About 16 days see rain.

rain gearlight clothes

Sea temperature near Gosen 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 30 km away) is warmest in August at about 26°C and coldest in March near 10°C.

It's comfortable for a long swim from Jun 22 to Oct 30 — about 4.3 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb10Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun19Cool
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov18Cool
Dec15Cool

UV index in Gosen 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 Gosen peaks around August 11 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 11UV 10Dec 21UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Gosen 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 Gosen is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1623 µg/m³Dec 1711 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar22Moderate
Apr23Moderate
May22Moderate
Jun18Moderate
Jul16Moderate
Aug14Moderate
Sep13Moderate
Oct13Moderate
Nov12Good
Dec11Good
Location & terrain

Where is Gosen?

Gosen sits at 37.7°N, 139.2°E, 9 m above sea level, in Japan. The nearest listed city is Muramatsu, 5.0 km away.

Topography around Gosen

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

Within 3 km, the terrain around Gosen has only modest variations in elevation — a maximum elevation change of 131 m around an average of 19 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,008 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,117 m.

The land around Gosen is covered by cropland (55%) and artificial surfaces (22%) within 3 km, trees (49%) and cropland (35%) within 16 km, and trees (56%) and water (32%) within 80 km.

3 km
131 m
16 km
1,008 m
80 km
2,117 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Muramatsu 5.0 km · Niitsu-honchō 8.0 km · Agano 12 km · Shirone 13 km · Suibara 14 km · Kamo 14 km · Kameda-honchō 16 km · Tsubame 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 Gosen (37.7333°, 139.1667°, elevation 9 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).