Tōkamachi weather in September

In September, Tōkamachi sees average daytime highs of 26°C and overnight lows near 17°C, with 177 mm of rain across 15.8 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 23°C by the end. The sky is clear or mostly clear about 18% 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 Tōkamachi's 6th-clearest and 9th-windiest month. For the whole year in context, see Tōkamachi's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
177 mm
15.8 wet days
Daylight
12 h 12 min
5:32 AM – 5:46 PM
Cloud cover
69%
6th clearest
Wind
6 km/h
9th windiest
Solar energy
3.96 kWh/m²
Travel score
5.5
out of 10

Tōkamachi is city in Niigata Prefecture, Japan.

Density
90/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 28°C in the first days to 23°C by the end.

A typical September day in Tōkamachi reaches about 26°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 30°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
32820
42820
52820
62819
72719
82719
92719
102719
112718
122618
132618
142618
152618
162617
172517
182517
192517
202516
212516
222416
232416
242415
252415
262415
272315
282315
292314
302314

How September really feels in Tōkamachi

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.

Tōkamachi weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°22725.621.99.70.0
Feb / -2°16821.417.810.60.1
Mar / -0°16220.611.711.71.3
Apr16° / 12215.51.712.94.3
May22° / 11°12713.90146.0
Jun25° / 16°15115.3014.55.7
Jul29° / 21°24319.1014.34.4
Aug30° / 21°17116.7013.44.2
Sep26° / 17°17715.8012.35.5
Oct20° / 11°17415.90115.3
Nov13° / 16618.22.3103.0
Dec / -0°21823.614.29.50.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% 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 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13862
23961
33961
43763
53862
63862
73862
83862
93862
103763
113763
123862
133862
143664
153763
163565
173565
183565
193466
203466
213466
223367
233367
243367
253367
263268
273268
283367
293367
303367

Chance of precipitation in September

Any precipitation

Tōkamachi gets around 177 mm of rain over 15.8 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 54% and peaks near 57% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
156
256
356
456
556
657
757
857
956
1056
1156
1256
1355
1454
1554
1653
1752
1852
1951
2051
2150
2250
2350
2450
2551
2651
2751
2852
2952
3052

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1031648321
2031748301
3041948281
4042048271
5052148251
6062247241
7162447220
8172546210
9182645190
10292744180
112112843160
123122941150
134133040130
145153138120
156163136100
16818323490
17919333280
181021332970
191222332760
201324332550
211526332340
221727322130
231829321930
242030311720
252132301520
262233301320
272435291110
282536281010
29263727910
30283726810

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:20 AM to 5:44 AM, and sunset from 6:10 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:206:10
212.85:206:08
312.85:216:07
412.75:226:05
512.75:236:04
612.65:246:02
712.65:256:00
812.65:255:59
912.55:265:57
1012.55:275:56
1112.45:285:54
1212.45:295:53
1312.45:305:51
1412.35:315:49
1512.35:315:48
1612.25:325:46
1712.25:335:45
1812.25:345:43
1912.15:355:42
2012.15:365:40
2112.05:365:38
2212.05:375:37
2311.95:385:35
2411.95:395:34
2511.95:405:32
2611.85:415:30
2711.85:425:29
2811.75:435:27
2911.75:435:26
3011.75:445:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.96 kWh/m².

For context, solar energy here swings from a low near 1.86 kWh/m² to a high of 5.67 kWh/m² in May across the year — September's 3.96 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.3Bright
74.2Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.0Bright
134.0Bright
144.0Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.8Moderate
193.8Moderate
203.8Moderate
213.7Moderate
223.7Moderate
233.7Moderate
243.7Moderate
253.6Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Tōkamachi

In seasonPeak

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

Tōkamachi 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 Tōkamachi?

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
5.2
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Tōkamachi for sightseeing.

What to pack for Tōkamachi in September

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

In September, Tōkamachi sees daytime highs around 26°C and nights near 17°C. Pack rain gear. Worth having: light clothes. About 16 days see rain.

rain gearlight clothes

Sea temperature near Tōkamachi 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 27°C and coldest in March near 10°C.

It's comfortable for a long swim from Jun 21 to Oct 31 — about 4.4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun20Cool
Jul23Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov18Cool
Dec15Cool

UV index in Tōkamachi 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 Tōkamachi peaks around August 12 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 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 12UV 10Dec 21UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Moderate

Air quality in Tōkamachi 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 Tōkamachi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1723 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar22Moderate
Apr23Moderate
May22Moderate
Jun19Moderate
Jul17Moderate
Aug14Moderate
Sep12Moderate
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Tōkamachi?

Tōkamachi sits at 37.1°N, 138.8°E, 154 m above sea level, in Japan. The nearest listed city is Minamiuonuma, 11 km away.

Topography around Tōkamachi

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

Within 3 km, the terrain around Tōkamachi has significant variations in elevation — a maximum elevation change of 340 m around an average of 207 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 970 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,551 m.

The land around Tōkamachi is covered by trees (54%) and artificial surfaces (21%) within 3 km, trees (75%) within 16 km, and trees (69%) and water (20%) within 80 km.

3 km
340 m
16 km
970 m
80 km
2,551 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Minamiuonuma 11 km · Muikamachi 13 km · Shiozawa 13 km · Ojiya 19 km · Uonuma 21 km · Kashiwazaki 32 km · Nagaoka 36 km · Tochio-honchō 43 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 Tōkamachi (37.1333°, 138.7667°, elevation 154 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).