Yamada weather in September

In September, Yamada sees average daytime highs of 20°C and overnight lows near 18°C, with 201 mm of rain across 13.8 wet days and about 12.3 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 19°C by the end. The sky is clear or mostly clear about 24% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Yamada's 9th-clearest and 9th-windiest month. For the whole year in context, see Yamada's year-round climate.

Daytime high
20°
2nd warmest
Overnight low
18°
11th coldest
Rainfall
201 mm
13.8 wet days
Daylight
12 h 18 min
5:19 AM – 5:34 PM
Cloud cover
68%
9th clearest
Wind
16 km/h
9th windiest
Solar energy
3.76 kWh/m²
Travel score
5.6
out of 10

Yamada is town in Shimohei District, Iwate Prefecture, Japan.

Density
58/km²
people per km²
Founded
1889

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 22°C in the first days to 19°C by the end.

A typical September day in Yamada reaches about 20°C in the afternoon and slips back to 18°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 23°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12220
22220
32220
42220
52220
62220
72119
82119
92119
102119
112119
122119
132119
142119
152118
162018
172018
182018
192018
202018
212017
222017
232017
241917
251917
261917
271917
281916
291916
301916

How September really feels in Yamada

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.

Yamada weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°739.14.89.50.0
Feb / -1°648.85.510.40.0
Mar / 10511.35.511.70.2
Apr / 10610.61131.7
May13° / 10°11810.9014.13.4
Jun16° / 14°13012.1014.74.6
Jul20° / 18°15914.3014.55.5
Aug22° / 20°16712.9013.56.1
Sep20° / 18°20113.8012.35.6
Oct16° / 13°17511.40115.1
Nov12° / 849.50.29.83.1
Dec / 809.62.69.30.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13268
23268
33268
43466
53466
63466
73565
83466
93565
103664
113565
123565
133565
143664
153664
163664
173565
183565
193565
203565
213565
223763
233763
243862
253862
263961
273961
284060
294159
304159

Chance of precipitation in September

Any precipitation

Yamada gets around 201 mm of rain over 13.8 wet days in September, the wettest month. 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. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
149
249
350
450
550
650
750
850
950
1049
1149
1249
1349
1448
1548
1648
1747
1846
1946
2045
2144
2244
2343
2443
2543
2642
2742
2842
2942
3042

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 29% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1110324116
2110334016
3111333916
4212343815
5213343615
6214353514
7215353413
8316363313
9317363212
10419363011
11520362910
1262136289
1372236269
1492436248
15102535237
16122635216
17142735195
18152834175
19172933164
20203033143
21223132133
22243231122
23263229112
24283328101
2530332791
2632342681
2734352470
2836352360
2938352250
3040352040

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:05 AM to 5:32 AM, and sunset from 5:59 PM to 5:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:055:59
212.95:065:58
312.85:075:56
412.85:085:54
512.75:085:53
612.75:095:51
712.65:105:49
812.65:115:48
912.65:125:46
1012.55:135:44
1112.55:145:43
1212.45:155:41
1312.45:165:39
1412.35:175:38
1512.35:185:36
1612.35:195:34
1712.25:205:32
1812.25:215:31
1912.15:225:29
2012.15:235:27
2112.05:245:26
2212.05:255:24
2311.95:265:22
2411.95:275:21
2511.95:285:19
2611.85:295:17
2711.85:295:16
2811.75:305:14
2911.75:315:12
3011.65:325:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.76 kWh/m².

For context, solar energy here swings from a low near 2.04 kWh/m² to a high of 5.45 kWh/m² in May across the year — September's 3.76 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.0Bright
34.0Bright
44.0Moderate
54.0Moderate
63.9Moderate
73.9Moderate
83.9Moderate
93.9Moderate
103.8Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.7Moderate
153.7Moderate
163.7Moderate
173.7Moderate
183.7Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.6Moderate
233.6Moderate
243.6Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Yamada

In seasonPeak

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

Yamada 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 Yamada?

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

5.6
Sightseeing
2nd-best month of the year
3.1
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Yamada for sightseeing.

What to pack for Yamada in September

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

In September, Yamada sees daytime highs around 20°C and nights near 18°C. Pack rain gear. About 14 days see rain.

rain gear

Sea temperature near Yamada in September

The nearest coast averages about 21°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 18 km away) is warmest in August at about 22°C and coldest in March near 7°C.

It's comfortable for a long swim from Jul 31 to Sep 27 — about 1.9 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan10Bracing
Feb8Bracing
Mar7Bracing
Apr8Bracing
May11Bracing
Jun15Cool
Jul19Cool
Aug22Refreshing
Sep21Refreshing
Oct18Cool
Nov16Cool
Dec13Bracing

UV index in Yamada in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yamada peaks around August 19 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighVery highHighModerateLowAug 19UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun7Very high
Jul6High
Aug9Very high
Sep7Very high
Oct5Moderate
Nov2Moderate
Dec2Low

Air quality in Yamada 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 Yamada is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1320 µg/m³Dec 169 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb14Moderate
Mar19Moderate
Apr20Moderate
May18Moderate
Jun13Moderate
Jul12Good
Aug10Good
Sep10Good
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is Yamada?

Yamada sits at 39.5°N, 141.9°E, 4 m above sea level, in Japan. The nearest listed city is Miyako, 20 km away.

Topography around Yamada

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

Within 3 km, the terrain around Yamada has significant variations in elevation — a maximum elevation change of 303 m around an average of 63 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,116 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,869 m.

The land around Yamada is covered by trees (59%) and water (26%) within 3 km, trees (63%) and water (33%) within 16 km, and trees (58%) and water (36%) within 80 km.

3 km
303 m
16 km
1,116 m
80 km
1,869 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Miyako 20 km · Kamaishi 22 km · Tōno 40 km · Ōfunato 48 km · Rikuzen-Takata 56 km · Hizume 68 km · Kesennuma 71 km · Yahaba 71 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 Yamada (39.4667°, 141.95°, elevation 4 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).