Nasukarasuyama weather in September

In September, Nasukarasuyama sees average daytime highs of 25°C and overnight lows near 18°C, with 167 mm of rain across 14.5 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 28°C in the first days to 23°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 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 Nasukarasuyama's 9th-clearest and 9th-windiest month. For the whole year in context, see Nasukarasuyama's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
18°
10th coldest
Rainfall
167 mm
14.5 wet days
Daylight
12 h 12 min
5:27 AM – 5:41 PM
Cloud cover
71%
9th clearest
Wind
7 km/h
9th windiest
Solar energy
3.62 kWh/m²
Travel score
5.8
out of 10

Nasukarasuyama is city in Tochigi Prefecture, Japan.

Density
143/km²
people per km²
Founded
2005

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 Nasukarasuyama reaches about 25°C in the afternoon and slips back to 18°C overnight — a 7°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)
12821
22821
32821
42820
52720
62720
72720
82720
92720
102720
112619
122619
132619
142619
152619
162518
172518
182518
192518
202517
212417
222417
232417
242417
252416
262316
272316
282316
292316
302315

How September really feels in Nasukarasuyama

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.

Nasukarasuyama 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 / -1°5262.99.80.9
Feb / -1°5272.910.61.3
Mar11° / 10011.72.911.72.8
Apr17° / 11412.10.712.95.0
May22° / 12°13212.6013.96.1
Jun25° / 17°14315.2014.55.6
Jul28° / 21°18618.2014.34.6
Aug29° / 22°14115.7013.44.5
Sep25° / 18°16714.5012.25.8
Oct20° / 12°16012.3011.15.9
Nov14° / 7980.1104.5
Dec / 5071.19.52.1

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 16% of September, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13367
23367
33367
43367
53367
63466
73367
83268
93268
103367
113268
123169
133169
143169
153169
163268
173169
183169
193169
203268
213268
223367
233367
243367
253466
263466
273466
283664
293664
303763

Chance of precipitation in September

Any precipitation

Nasukarasuyama gets around 167 mm of rain over 14.5 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 52% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
151
251
351
452
552
652
752
852
952
1052
1152
1252
1351
1451
1550
1650
1749
1848
1948
2047
2146
2246
2345
2445
2545
2645
2745
2845
2945
3045

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 28% 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 (%)
1051935392
2052035382
3062135362
4162235352
5172334341
6182434321
7182534311
8292633291
92102633281
103112732261
114122731251
124132831230
135142930210
147152929200
158163028180
169173028160
1711183027140
1812193025130
1914213124110
201522312390
211723312280
221924312070
232025311960
242226311750
252327311640
262428311430
272529301330
282730301220
292831291020
30303128910

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
56calm
66calm
76calm
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 5:14 AM to 5:39 AM, and sunset from 6:04 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:146:04
212.85:156:02
312.75:166:01
412.75:175:59
512.75:185:58
612.65:195:56
712.65:195:55
812.55:205:53
912.55:215:52
1012.55:225:50
1112.45:235:48
1212.45:235:47
1312.35:245:45
1412.35:255:44
1512.35:265:42
1612.25:275:41
1712.25:285:39
1812.25:285:37
1912.15:295:36
2012.15:305:34
2112.05:315:33
2212.05:325:31
2311.95:335:30
2411.95:335:28
2511.95:345:26
2611.85:355:25
2711.85:365:23
2811.85:375:22
2911.75:385:20
3011.75:395:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.62 kWh/m².

For context, solar energy here swings from a low near 2.35 kWh/m² to a high of 5.2 kWh/m² in May across the year — September's 3.62 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Moderate
34.0Moderate
43.9Moderate
53.9Moderate
63.9Moderate
73.8Moderate
83.8Moderate
93.8Moderate
103.8Moderate
113.7Moderate
123.7Moderate
133.7Moderate
143.6Moderate
153.6Moderate
163.6Moderate
173.5Moderate
183.5Moderate
193.5Moderate
203.5Moderate
213.4Moderate
223.4Moderate
233.4Moderate
243.4Moderate
253.3Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Hazard calendar for Nasukarasuyama

In seasonPeak

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

Nasukarasuyama 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 Nasukarasuyama?

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

5.8
Sightseeing
3rd-best month of the year
5.3
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Nasukarasuyama for sightseeing.

What to pack for Nasukarasuyama in September

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

In September, Nasukarasuyama sees daytime highs around 25°C and nights near 18°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Nasukarasuyama in September

The nearest coast averages about 23°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 52 km away) is warmest in August at about 24°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 24 to Oct 28 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun19Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Nasukarasuyama 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 Nasukarasuyama peaks around July 17 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 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 17UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Low

Air quality in Nasukarasuyama 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 Nasukarasuyama is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun16Moderate
Jul14Moderate
Aug13Moderate
Sep11Good
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is Nasukarasuyama?

Nasukarasuyama sits at 36.7°N, 140.2°E, 89 m above sea level, in Japan. The nearest listed city is Karasuyama, 1.0 km away.

Topography around Nasukarasuyama

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

Within 3 km, the terrain around Nasukarasuyama has only modest variations in elevation — a maximum elevation change of 234 m around an average of 125 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 490 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,553 m.

The land around Nasukarasuyama is covered by trees (63%) within 3 km, trees (71%) within 16 km, and trees (58%) within 80 km.

3 km
234 m
16 km
490 m
80 km
2,553 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Karasuyama 1.0 km · Ogawa 11 km · Hōshakuji 16 km · Sakura 17 km · Ujiie 18 km · Daigo 21 km · Mashiko 21 km · Hitachiomiya 24 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 Nasukarasuyama (36.6523°, 140.1608°, elevation 89 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).