Kesennuma weather in September

In September, Kesennuma sees average daytime highs of 23°C and overnight lows near 17°C, with 171 mm of rain across 13.7 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 21°C by the end. The sky is clear or mostly clear about 21% 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 Kesennuma's 9th-clearest and 9th-windiest month. For the whole year in context, see Kesennuma's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
171 mm
13.7 wet days
Daylight
12 h 12 min
5:21 AM – 5:35 PM
Cloud cover
71%
9th clearest
Wind
10 km/h
9th windiest
Solar energy
3.76 kWh/m²
Travel score
5.9
out of 10

Kesennuma is city in Miyagi Prefecture, Japan.

Density
184/km²
people per km²
Founded
1953

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 25°C in the first days to 21°C by the end.

A typical September day in Kesennuma reaches about 23°C in the afternoon and slips back to 17°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 26°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12520
22519
32519
42519
52519
62419
72419
82419
92419
102418
112418
122418
132318
142318
152317
162317
172317
182317
192216
202216
212216
222216
232216
242215
252115
262115
272115
282114
292114
302014

How September really feels in Kesennuma

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.

Kesennuma weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°497.24.89.60.0
Feb / -2°457.44.910.50.0
Mar / 9210.84.411.71.2
Apr13° / 10011.21.1133.5
May18° / 11°11611.7014.15.3
Jun21° / 15°12612.1014.75.7
Jul24° / 19°16415.6014.45.7
Aug26° / 21°15414.2013.55.8
Sep23° / 17°17113.7012.35.9
Oct18° / 11°14010.40115.6
Nov12° / 708.60.39.93.3
Dec / 598.93.29.30.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% 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 (%)
13169
23169
33070
43070
53268
63268
73169
83169
93169
103169
113268
123268
133268
143169
153268
163268
173169
183169
193169
203268
213268
223268
233367
243466
253466
263466
273565
283664
293763
303763

Chance of precipitation in September

Any precipitation

Kesennuma gets around 171 mm of rain over 13.7 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 46% and peaks near 50% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
148
248
349
449
550
650
750
850
950
1050
1150
1250
1349
1449
1548
1648
1747
1846
1945
2044
2143
2243
2342
2441
2541
2640
2740
2840
2939
3039

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 27% 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 (%)
11122835221
21132935211
31142935201
41152934191
52162934181
62173034171
73183033161
83203032151
94213031141
105222931131
116232929120
127242928110
139252927100
141126292590
151327292380
161528292270
171729292060
181929281860
192230271650
202430271450
212730261340
222931261130
233231251030
24343124820
25363223720
26383222620
27403221510
28433219510
29453218410
30473217400

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3011calm

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 5:07 AM to 5:34 AM, and sunset from 6:00 PM to 5:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:076:00
212.85:085:59
312.85:095:57
412.85:095:55
512.75:105:54
612.75:115:52
712.65:125:50
812.65:135:49
912.65:145:47
1012.55:155:45
1112.55:165:44
1212.45:175:42
1312.45:185:41
1412.35:195:39
1512.35:205:37
1612.25:215:35
1712.25:215:34
1812.25:225:32
1912.15:235:30
2012.15:245:29
2112.05:255:27
2212.05:265:25
2311.95:275:24
2411.95:285:22
2511.95:295:20
2611.85:305:19
2711.85:315:17
2811.75:325:16
2911.75:335:14
3011.65:345:12

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 2.09 kWh/m² to a high of 5.46 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
253.6Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Kesennuma

In seasonPeak

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

Kesennuma 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 Kesennuma?

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

5.9
Sightseeing
1st-best month of the year
4.5
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Kesennuma for sightseeing.

What to pack for Kesennuma in September

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

In September, Kesennuma sees daytime highs around 23°C and nights near 17°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Kesennuma 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 offshore 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 Kesennuma 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 Kesennuma 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 highHighModerateLowAug 18UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul7High
Aug9Very high
Sep7Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Kesennuma 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 Kesennuma is worst in April — around 19 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1319 µg/m³Dec 179 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar18Moderate
Apr19Moderate
May17Moderate
Jun12Moderate
Jul11Good
Aug9Good
Sep10Good
Oct10Good
Nov10Good
Dec9Good
Location & terrain

Where is Kesennuma?

Kesennuma sits at 38.9°N, 141.6°E, 14 m above sea level, in Japan. The nearest listed city is Rikuzen-Takata, 15 km away.

Topography around Kesennuma

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

Within 3 km, the terrain around Kesennuma has significant variations in elevation — a maximum elevation change of 350 m around an average of 54 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 890 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,889 m.

The land around Kesennuma is covered by trees (54%) and artificial surfaces (30%) within 3 km, trees (55%) and water (36%) within 16 km, and trees (54%) and water (33%) within 80 km.

3 km
350 m
16 km
890 m
80 km
1,889 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Rikuzen-Takata 15 km · Ōfunato 22 km · Ichinoseki 38 km · Tome 42 km · Ōshū 44 km · Mizusawa 46 km · Tōno 46 km · Kamaishi 49 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 Kesennuma (38.9011°, 141.5775°, elevation 14 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).