Tosayamadachō-nakano weather in September

In September, Tosayamadachō-nakano sees average daytime highs of 27°C and overnight lows near 22°C, with 247 mm of rain across 15.2 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 25°C by the end. The sky is clear or mostly clear about 33% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Tosayamadachō-nakano's 8th-clearest and 8th-windiest month. For the whole year in context, see Tosayamadachō-nakano's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
247 mm
15.2 wet days
Daylight
12 h 12 min
5:53 AM – 6:06 PM
Cloud cover
60%
8th clearest
Wind
9 km/h
8th windiest
Solar energy
4.4 kWh/m²
Travel score
5.6
out of 10

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 25°C by the end.

A typical September day in Tosayamadachō-nakano reaches about 27°C in the afternoon and slips back to 22°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12924
22824
32824
42824
52824
62824
72824
82823
92823
102823
112823
122823
132723
142723
152723
162722
172722
182722
192722
202722
212622
222621
232621
242621
252621
262621
272621
282520
292520
302520

How September really feels in Tosayamadachō-nakano

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.

Tosayamadachō-nakano weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan11° / 636102.8
Feb11° / 857.410.83.1
Mar14° / 14310.511.74.3
Apr19° / 12°17410.412.85.9
May22° / 16°20011.513.76.4
Jun25° / 21°32117.114.25.4
Jul28° / 24°32618.7144.6
Aug29° / 25°21818.313.24.4
Sep27° / 22°24715.212.25.6
Oct23° / 17°1839.911.27.0
Nov18° / 12°987.510.36.2
Dec13° / 755.79.84.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24852
34852
44753
54753
64753
74753
84753
94852
104753
114753
124852
134852
144951
154951
164852
174951
184852
194951
204951
214951
224951
234951
244852
254951
265050
275050
284951
295050
305050

Chance of precipitation in September

Any precipitation

Tosayamadachō-nakano gets around 247 mm of rain over 15.2 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 50% and peaks near 57% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
157
256
356
456
555
655
755
854
954
1054
1153
1252
1352
1451
1551
1650
1750
1850
1949
2049
2148
2248
2347
2446
2546
2645
2745
2844
2943
3043

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 41% of days. Sticky, muggy-or-worse air turns up on roughly 75% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1003176317
2003196216
3004206115
4004226113
5004236112
6015245911
7015265810
801627579
901728568
1001829557
1112930526
12121031506
13131132485
14131332464
15241433444
16251633413
17251733393
18261933372
19372033352
20382233332
21392333301
223102532281
234112632261
244122831241
254132931231
264143031211
274153130191
285163129181
295173229160
306183328150

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 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 60 minutes over September. Sunrise moves from 5:43 AM to 6:03 AM, and sunset from 6:27 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:436:27
212.75:446:26
312.75:446:24
412.65:456:23
512.65:466:21
612.65:466:20
712.55:476:19
812.55:486:17
912.55:496:16
1012.45:496:14
1112.45:506:13
1212.35:516:12
1312.35:516:10
1412.35:526:09
1512.25:536:07
1612.25:536:06
1712.25:546:04
1812.15:556:03
1912.15:566:01
2012.15:566:00
2112.05:575:59
2212.05:585:57
2312.05:585:56
2411.95:595:54
2511.96:005:53
2611.86:005:51
2711.86:015:50
2811.86:025:49
2911.76:035:47
3011.76:035:46

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.4 kWh/m².

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 5.61 kWh/m² in May across the year — September's 4.4 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
24.9Bright
34.9Bright
44.8Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.6Bright
134.5Bright
144.5Bright
154.5Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.0Bright
284.0Bright
294.0Bright
304.0Moderate
Planning a trip in September

Hazard calendar for Tosayamadachō-nakano

In seasonPeak

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

Tosayamadachō-nakano sits in the Pacific typhoon belt; the season peaks July–October.

Tosayamadachō-nakano's rainy season runs April–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Tosayamadachō-nakano?

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

5.6
Sightseeing
5th-best month of the year
5.8
Beach & pool
1st-best month of the year

September is a reasonable time to visit Tosayamadachō-nakano for sightseeing.

What to pack for Tosayamadachō-nakano in September

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

In September, Tosayamadachō-nakano sees daytime highs around 27°C and nights near 22°C. Pack light clothes and rain gear. About 15 days see rain.

light clothesrain gear

Sea temperature near Tosayamadachō-nakano in September

The nearest coast averages about 27°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 26 km away) is warmest in August at about 28°C and coldest in February near 17°C.

It's comfortable for a long swim from May 6 to Dec 16 — about 7.4 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan18Cool
Feb17Cool
Mar17Cool
Apr19Cool
May21Refreshing
Jun23Refreshing
Jul26Warm
Aug28Warm
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec20Refreshing

UV index in Tosayamadachō-nakano in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tosayamadachō-nakano peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJun 23UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul10Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Tosayamadachō-nakano 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 Tosayamadachō-nakano is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1321 µg/m³Oct 1311 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar20Moderate
Apr22Moderate
May19Moderate
Jun16Moderate
Jul13Moderate
Aug12Moderate
Sep11Good
Oct11Good
Nov12Good
Dec11Good
Location & terrain

Where is Tosayamadachō-nakano?

Tosayamadachō-nakano sits at 33.6°N, 133.7°E, 41 m above sea level, in Japan. The nearest listed city is Yamashita, 4.0 km away.

Topography around Tosayamadachō-nakano

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

Within 3 km, the terrain around Tosayamadachō-nakano has only modest variations in elevation — a maximum elevation change of 197 m around an average of 44 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,226 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,939 m.

The land around Tosayamadachō-nakano is covered by cropland (39%), artificial surfaces (29%) and trees (23%) within 3 km, trees (61%) and water (20%) within 16 km, and trees (56%) and water (38%) within 80 km.

3 km
197 m
16 km
1,226 m
80 km
1,939 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Yamashita 4.0 km · Nankoku 5.0 km · Kochi 15 km · Aki 23 km · Ino 24 km · Tosa 25 km · Susaki 43 km · Shikokuchūō 44 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 Tosayamadachō-nakano (33.6°, 133.6833°, elevation 41 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).