Ichinoseki weather in September

In September, Ichinoseki sees average daytime highs of 24°C and overnight lows near 17°C, with 149 mm of rain across 12.9 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 21°C by the end. The sky is clear or mostly clear about 19% 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 Ichinoseki's 9th-clearest and 9th-windiest month. For the whole year in context, see Ichinoseki's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
149 mm
12.9 wet days
Daylight
12 h 12 min
5:22 AM – 5:37 PM
Cloud cover
72%
9th clearest
Wind
8 km/h
9th windiest
Solar energy
3.64 kWh/m²
Travel score
6.0
out of 10

Ichinoseki is city in Iwate Prefecture, Japan.

Density
91/km²
people per km²
Founded
1948

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 26°C in the first days to 21°C by the end.

A typical September day in Ichinoseki reaches about 24°C in the afternoon and slips back to 17°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 28°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)
12619
22619
32619
42619
52619
62619
72519
82518
92518
102518
112518
122518
132417
142417
152417
162417
172416
182316
192316
202316
212315
222315
232215
242215
252214
262214
272214
282114
292113
302113

How September really feels in Ichinoseki

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.

Ichinoseki 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 / -3°508.77.89.60.0
Feb / -3°468.26.610.50.1
Mar / -0°8711.75.411.71.5
Apr14° / 9211.61134.1
May19° / 10°10411.6014.15.8
Jun22° / 15°11512.1014.76.0
Jul26° / 19°15615.9014.45.5
Aug27° / 21°14214.8013.55.5
Sep24° / 17°14912.9012.36.0
Oct18° / 10°12210.30115.7
Nov12° / 649.40.99.93.2
Dec / -1°5810.15.49.30.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 68%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13070
23070
33070
43070
53070
63070
73169
83169
93169
103268
113169
123169
133169
143268
153268
163268
173169
183169
193169
203268
213268
223268
233367
243367
253466
263466
273565
283565
293664
303664

Chance of precipitation in September

Any precipitation

Ichinoseki gets around 149 mm of rain over 12.9 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 44% and peaks near 49% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
148
248
348
448
549
649
749
849
949
1049
1149
1248
1348
1447
1546
1645
1744
1843
1942
2041
2140
2239
2338
2438
2537
2637
2737
2836
2936
3036

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 26% of days. Sticky, muggy-or-worse air turns up on roughly 30% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
11132733241
21132833231
31142933221
41152932211
52163032191
62173032181
72183031171
83193030161
94213030151
105223029141
116233028131
128242926121
139252925110
1411262924100
151327292290
161528282180
171729281970
182029271760
192230261650
202530261450
212830251340
223031241140
233331241030
24353123930
25373122820
26403121720
27423120610
28443119510
29463118510
30483116400

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 5:08 AM to 5:36 AM, and sunset from 6:02 PM to 5:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:086:02
212.85:096:00
312.85:105:59
412.85:115:57
512.75:125:55
612.75:135:54
712.65:145:52
812.65:155:51
912.65:165:49
1012.55:175:47
1112.55:185:46
1212.45:195:44
1312.45:205:42
1412.35:205:41
1512.35:215:39
1612.25:225:37
1712.25:235:36
1812.25:245:34
1912.15:255:32
2012.15:265:31
2112.05:275:29
2212.05:285:27
2311.95:295:26
2411.95:305:24
2511.95:315:22
2611.85:325:21
2711.85:335:19
2811.75:345:17
2911.75:355:16
3011.65:365:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.64 kWh/m².

For context, solar energy here swings from a low near 2.01 kWh/m² to a high of 5.35 kWh/m² in May across the year — September's 3.64 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
43.8Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.7Moderate
93.7Moderate
103.7Moderate
113.7Moderate
123.6Moderate
133.6Moderate
143.6Moderate
153.6Moderate
163.6Moderate
173.6Moderate
183.6Moderate
193.5Moderate
203.5Moderate
213.5Moderate
223.5Moderate
233.5Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.4Moderate
283.4Moderate
293.4Moderate
303.4Moderate
Planning a trip in September

Hazard calendar for Ichinoseki

In seasonPeak

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

Ichinoseki 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 Ichinoseki?

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

6.0
Sightseeing
1st-best month of the year
4.9
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Ichinoseki for sightseeing.

What to pack for Ichinoseki in September

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

In September, Ichinoseki sees daytime highs around 24°C and nights near 17°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near Ichinoseki in September

The nearest coast averages about 22°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 43 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 21 to Oct 3 — about 2.5 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan11Bracing
Feb8Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun17Cool
Jul20Cool
Aug22Refreshing
Sep22Refreshing
Oct19Cool
Nov16Cool
Dec13Bracing

UV index in Ichinoseki in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ichinoseki peaks around August 18 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 highVery highModerateLowAug 18UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul6High
Aug9Very high
Sep8Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Ichinoseki 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 Ichinoseki 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 1620 µg/m³Dec 1710 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb14Moderate
Mar19Moderate
Apr20Moderate
May19Moderate
Jun14Moderate
Jul12Moderate
Aug11Good
Sep11Good
Oct11Good
Nov11Good
Dec9Good
Location & terrain

Where is Ichinoseki?

Ichinoseki sits at 38.9°N, 141.1°E, 30 m above sea level, in Japan. The nearest listed city is Kurihara, 22 km away.

Topography around Ichinoseki

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

Within 3 km, the terrain around Ichinoseki has only modest variations in elevation — a maximum elevation change of 150 m around an average of 63 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 590 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,889 m.

The land around Ichinoseki is covered by trees (52%) and artificial surfaces (35%) within 3 km, trees (74%) within 16 km, and trees (64%) within 80 km.

3 km
150 m
16 km
590 m
80 km
1,889 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Kurihara 22 km · Tome 23 km · Mizusawa 24 km · Ōshū 25 km · Kanegasaki 32 km · Kesennuma 38 km · Ōsaki 39 km · Kitakami 41 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 Ichinoseki (38.9167°, 141.1333°, elevation 30 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).