Mashiko weather in September

In September, Mashiko sees average daytime highs of 27°C and overnight lows near 19°C, with 165 mm of rain across 14.1 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 24°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 Mashiko's 10th-clearest and 6th-windiest month. For the whole year in context, see Mashiko's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
19°
10th coldest
Rainfall
165 mm
14.1 wet days
Daylight
12 h 12 min
5:27 AM – 5:41 PM
Cloud cover
70%
10th clearest
Wind
7 km/h
6th windiest
Solar energy
3.55 kWh/m²
Travel score
5.6
out of 10

Mashiko is town in Haga district, Tochigi prefecture, Japan.

Density
291/km²
people per km²
Founded
1894

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 24°C by the end.

A typical September day in Mashiko 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 22°C and 31°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)
12922
22922
32922
42922
52921
62921
72821
82821
92821
102821
112820
122720
132720
142720
152720
162719
172619
182619
192619
202618
212618
222518
232518
242518
252517
262517
272417
282417
292417
302416

How September really feels in Mashiko

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.

Mashiko 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 / -0°526.11.49.81.8
Feb10° / 516.61.810.62.2
Mar13° / 9711.41.111.73.6
Apr18° / 10911.70.212.95.5
May23° / 13°13412.4013.96.3
Jun26° / 18°14415.1014.45.5
Jul29° / 22°17416.4014.24.4
Aug30° / 23°12813.8013.44.2
Sep27° / 19°16514.1012.25.6
Oct21° / 13°16412011.16.2
Nov16° / 768.1010.15.2
Dec11° / 496.40.39.63.0

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 17% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33664
43565
53664
63664
73664
83664
93664
103565
113466
123565
133565
143466
153466
163466
173367
183367
193367
203367
213367
223466
233466
243466
253466
263466
273664
283664
293763
303763

Chance of precipitation in September

Any precipitation

Mashiko gets around 165 mm of rain over 14.1 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 47% and peaks near 50% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
145
246
346
447
547
648
748
849
949
1049
1150
1250
1350
1450
1549
1649
1749
1849
1948
2048
2147
2247
2346
2446
2546
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 54% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1021235455
2031336445
3031336435
4031436424
5041536414
6041636404
7051736393
8161836373
9161935363
10172035342
11282134332
12292234312
133102333292
144112433271
155122532251
165132731231
176142830201
187162929181
199173028160
2010183127140
2111193226120
2212203324110
231321332390
241422342280
251623342160
261724351950
271825351840
281925351730
292026351630
302127351520

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 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
17calm
27calm
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 5:15 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)
112.85:156:04
212.85:166:02
312.75:166:01
412.75:175:59
512.75:185:58
612.65:195:56
712.65:205:55
812.55:215:53
912.55:215:52
1012.55:225:50
1112.45:235:49
1212.45:245:47
1312.35:255:45
1412.35:255:44
1512.35:265:42
1612.25:275:41
1712.25:285:39
1812.15:295:38
1912.15:305:36
2012.15:305:35
2112.05:315:33
2212.05:325:31
2312.05:335:30
2411.95:345:28
2511.95:355:27
2611.85:355:25
2711.85:365:24
2811.85:375:22
2911.75:385:21
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 3.55 kWh/m².

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 5.08 kWh/m² in May across the year — September's 3.55 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
14.0Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.7Moderate
93.7Moderate
103.7Moderate
113.6Moderate
123.6Moderate
133.6Moderate
143.6Moderate
153.5Moderate
163.5Moderate
173.5Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.4Moderate
223.3Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.2Moderate
273.2Moderate
283.2Moderate
293.2Moderate
303.1Moderate
Planning a trip in September

Hazard calendar for Mashiko

In seasonPeak

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

Mashiko 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 Mashiko?

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
5.7
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Mashiko for sightseeing.

What to pack for Mashiko in September

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

In September, Mashiko sees daytime highs around 27°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Mashiko 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 48 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 Mashiko 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 Mashiko 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 (moderate).

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
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Mashiko 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 Mashiko 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 Mashiko?

Mashiko sits at 36.5°N, 140.1°E, 79 m above sea level, in Japan. The nearest listed city is Mooka, 8.0 km away.

Topography around Mashiko

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

Within 3 km, the terrain around Mashiko has only modest variations in elevation — a maximum elevation change of 237 m around an average of 107 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 491 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,553 m.

The land around Mashiko is covered by trees (54%) and cropland (25%) within 3 km, trees (54%) and cropland (28%) within 16 km, and trees (49%) and cropland (20%) within 80 km.

3 km
237 m
16 km
491 m
80 km
2,553 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Mooka 8.0 km · Iwase 13 km · Kaminokawa 17 km · Kasama 18 km · Chikusei 20 km · Karasuyama 21 km · Hōshakuji 21 km · Shimodate 21 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 Mashiko (36.4667°, 140.1°, elevation 79 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).