Nanto weather in September

In September, Nanto sees average daytime highs of 24°C and overnight lows near 16°C, with 289 mm of rain across 18.5 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 27°C in the first days to 22°C by the end. The sky is clear or mostly clear about 14% 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 Nanto's 8th-clearest and 11th-windiest month. For the whole year in context, see Nanto's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
289 mm
18.5 wet days
Daylight
12 h 12 min
5:40 AM – 5:54 PM
Cloud cover
72%
8th clearest
Wind
5 km/h
11th windiest
Solar energy
4.04 kWh/m²
Travel score
5.2
out of 10

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 Nanto reaches about 24°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 29°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)
12719
22719
32719
42719
52618
62618
72618
82618
92618
102618
112517
122517
132517
142517
152516
162416
172416
182416
192416
202415
212315
222315
232315
242314
252314
262214
272214
282214
292213
302213

How September really feels in Nanto

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.

Nanto 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 / -4°23024.222.19.80.0
Feb / -4°17920.217.610.60.0
Mar / -1°20720.212.911.71.2
Apr15° / 17515.83.212.93.9
May21° / 10°18615.40.113.95.6
Jun24° / 16°24718.1014.45.3
Jul28° / 20°33221.7014.24.4
Aug29° / 21°24920.4013.44.3
Sep24° / 16°28918.5012.25.2
Oct19° / 10°223170.211.15.0
Nov13° / 19918.44.310.12.7
Dec / -2°23722.816.39.60.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% 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 68%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23466
33367
43367
53367
63367
73268
83268
93268
103268
113268
123268
133268
143268
153169
163169
173169
183268
193169
203169
213169
223169
233169
243169
253169
263169
273070
283169
293169
303169

Chance of precipitation in September

Any precipitation

Nanto gets around 289 mm of rain over 18.5 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 63% and peaks near 68% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
168
268
368
468
567
667
767
866
966
1065
1164
1264
1363
1462
1562
1661
1760
1860
1960
2059
2159
2259
2359
2459
2559
2659
2759
2860
2960
3060

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 33% of days. Sticky, muggy-or-worse air turns up on roughly 37% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
105265415
206275413
306285412
407295311
518305110
61931509
711032508
811133487
921234476
1031334455
1131434445
1241535424
1351735403
1461835383
1582034353
1692134332
17112334312
18122533282
19142633261
20152832241
21173031211
22183130191
23203329171
24213528151
25233627131
26243826110
27263925100
2827402480
2929412370
3031412260

Wind in September

Winds average 5 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
185calm
195calm
205calm
215calm
225calm
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 5:28 AM to 5:52 AM, and sunset from 6:17 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:286:17
212.85:286:15
312.75:296:14
412.75:306:12
512.75:316:11
612.65:326:09
712.65:336:08
812.55:336:06
912.55:346:05
1012.55:356:03
1112.45:366:01
1212.45:376:00
1312.35:375:58
1412.35:385:57
1512.35:395:55
1612.25:405:54
1712.25:415:52
1812.15:425:50
1912.15:425:49
2012.15:435:47
2112.05:445:46
2212.05:455:44
2312.05:465:43
2411.95:465:41
2511.95:475:40
2611.85:485:38
2711.85:495:36
2811.85:505:35
2911.75:515:33
3011.75:525:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.04 kWh/m².

For context, solar energy here swings from a low near 2.02 kWh/m² to a high of 5.66 kWh/m² in May across the year — September's 4.04 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.4Bright
44.4Bright
54.3Bright
64.3Bright
74.3Bright
84.2Bright
94.2Bright
104.2Bright
114.1Bright
124.1Bright
134.1Bright
144.0Bright
154.0Bright
164.0Bright
174.0Moderate
184.0Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Nanto

In seasonPeak

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

Nanto 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 Nanto?

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

5.2
Sightseeing
3rd-best month of the year
4.4
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Nanto for sightseeing.

What to pack for Nanto in September

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

In September, Nanto sees daytime highs around 24°C and nights near 16°C. Pack rain gear. Worth having: light clothes. About 19 days see rain.

rain gearlight clothes

Sea temperature near Nanto 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 27 km away) is warmest in August at about 27°C and coldest in March near 11°C.

It's comfortable for a long swim from Jun 17 to Nov 3 — about 4.6 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb11Bracing
Mar11Bracing
Apr12Bracing
May16Cool
Jun20Cool
Jul24Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Nanto 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 Nanto peaks around July 20 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 highModerateJul 20UV 10Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun10Very high
Jul10Very high
Aug10Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Nanto 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 Nanto is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1621 µg/m³Dec 139 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar20Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul14Moderate
Aug12Good
Sep10Good
Oct10Good
Nov10Good
Dec9Good
Location & terrain

Where is Nanto?

Nanto sits at 36.5°N, 136.9°E, 141 m above sea level, in Japan. The nearest listed city is Fukumitsu, 5.0 km away.

Topography around Nanto

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

Within 3 km, the terrain around Nanto has significant variations in elevation — a maximum elevation change of 269 m around an average of 166 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,418 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,132 m.

The land around Nanto is covered by cropland (55%) and trees (27%) within 3 km, trees (75%) within 16 km, and trees (59%) and water (28%) within 80 km.

3 km
269 m
16 km
1,418 m
80 km
3,132 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Fukumitsu 5.0 km · Nanto-shi 6.0 km · Tonami 13 km · Oyabe 18 km · Tsubata 22 km · Yatsuomachi-higashikumisaka 22 km · Tsurugi-asahimachi 24 km · Nonoichi 25 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 Nanto (36.5127°, 136.8935°, elevation 141 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).