Tomiya weather in September

In September, Tomiya sees average daytime highs of 24°C and overnight lows near 18°C, with 168 mm of rain across 14 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 22°C by the end. The sky is clear or mostly clear about 20% 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 Tomiya's 9th-clearest and 9th-windiest month. For the whole year in context, see Tomiya's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
18°
10th coldest
Rainfall
168 mm
14 wet days
Daylight
12 h 12 min
5:23 AM – 5:38 PM
Cloud cover
71%
9th clearest
Wind
9 km/h
9th windiest
Solar energy
3.6 kWh/m²
Travel score
5.9
out of 10

Tomiya is city in Miyagi prefecture, Japan.

Density
1,066/km²
people per km²
Founded
2016

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 22°C by the end.

A typical September day in Tomiya reaches about 24°C in the afternoon and slips back to 18°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 28°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)
12621
22621
32620
42620
52620
62620
72620
82520
92519
102519
112519
122519
132519
142518
152418
162418
172418
182418
192417
202317
212317
222317
232316
242316
252316
262216
272215
282215
292215
302215

How September really feels in Tomiya

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.

Tomiya 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 / -2°569.26.19.60.0
Feb / -2°488.14.910.50.3
Mar / 89113.311.71.8
Apr14° / 9711.40.6134.2
May19° / 12°10911.4014.15.8
Jun22° / 16°13212.8014.65.9
Jul26° / 20°18916.7014.45.4
Aug27° / 22°16515.5013.55.5
Sep24° / 18°16814012.35.9
Oct19° / 11°14110.70115.9
Nov13° / 658.50.29.93.8
Dec / 589.63.89.41.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% 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 68%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13070
23070
33169
43169
53169
63169
73268
83367
93268
103268
113268
123367
133268
143268
153367
163268
173268
183169
193268
203169
213169
223268
233268
243268
253367
263466
273565
283565
293565
303664

Chance of precipitation in September

Any precipitation

Tomiya gets around 168 mm of rain over 14 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 47% and peaks near 52% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
152
252
352
452
552
652
752
852
951
1051
1150
1250
1350
1449
1549
1648
1747
1847
1946
2045
2144
2244
2343
2442
2542
2642
2741
2841
2941
3040

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 28% of days. Sticky, muggy-or-worse air turns up on roughly 40% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1062037315
2072137304
3072237294
4082337284
5192437263
61102536253
71112636243
81122735232
92132735212
102142834202
113152933191
124172932171
135183030161
146193029151
157213128131
169223126120
1710233124110
1812243123100
191326312190
201527311980
211728311870
221928311660
232129311550
242330301340
252531291230
262632291130
272833281020
28303326920
29323425810
30343424710

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 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 5:10 AM to 5:36 AM, and sunset from 6:02 PM to 5:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:106:02
212.85:116:01
312.85:125:59
412.75:135:58
512.75:145:56
612.75:145:54
712.65:155:53
812.65:165:51
912.55:175:50
1012.55:185:48
1112.55:195:46
1212.45:205:45
1312.45:215:43
1412.35:225:41
1512.35:235:40
1612.25:235:38
1712.25:245:36
1812.25:255:35
1912.15:265:33
2012.15:275:32
2112.05:285:30
2212.05:295:28
2311.95:305:27
2411.95:315:25
2511.95:325:23
2611.85:335:22
2711.85:335:20
2811.75:345:18
2911.75:355:17
3011.65:365:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.6 kWh/m².

For context, solar energy here swings from a low near 2.07 kWh/m² to a high of 5.35 kWh/m² in May across the year — September's 3.6 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.8Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.7Moderate
73.7Moderate
83.7Moderate
93.7Moderate
103.6Moderate
113.6Moderate
123.6Moderate
133.6Moderate
143.6Moderate
153.6Moderate
163.5Moderate
173.5Moderate
183.5Moderate
193.5Moderate
203.5Moderate
213.5Moderate
223.5Moderate
233.4Moderate
243.4Moderate
253.4Moderate
263.4Moderate
273.4Moderate
283.4Moderate
293.3Moderate
303.3Moderate
Planning a trip in September

Hazard calendar for Tomiya

In seasonPeak

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

Tomiya sits in the Pacific typhoon belt; the season peaks July–October.

Tomiya's rainy season runs March–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 Tomiya?

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
5.0
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Tomiya for sightseeing.

What to pack for Tomiya in September

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

In September, Tomiya sees daytime highs around 24°C and nights near 18°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Tomiya in September

The nearest coast averages about 23°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 36 km away) is warmest in August at about 24°C and coldest in March near 9°C.

It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan11Bracing
Feb9Bracing
Mar9Bracing
Apr10Bracing
May14Bracing
Jun18Cool
Jul21Refreshing
Aug24Refreshing
Sep23Refreshing
Oct19Cool
Nov17Cool
Dec14Bracing

UV index in Tomiya 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 Tomiya peaks around August 16 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 16UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Tomiya 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 Tomiya is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1621 µg/m³Dec 1710 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar20Moderate
Apr21Moderate
May20Moderate
Jun14Moderate
Jul12Good
Aug10Good
Sep10Good
Oct11Good
Nov11Good
Dec9Good
Location & terrain

Where is Tomiya?

Tomiya sits at 38.4°N, 140.9°E, 64 m above sea level, in Japan. The nearest listed city is Yoshioka, 5.0 km away.

Topography around Tomiya

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

Within 3 km, the terrain around Tomiya has only modest variations in elevation — a maximum elevation change of 114 m around an average of 53 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,175 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,978 m.

The land around Tomiya is covered by trees (56%) and artificial surfaces (20%) within 3 km, trees (59%) and artificial surfaces (20%) within 16 km, and trees (58%) and water (25%) within 80 km.

3 km
114 m
16 km
1,175 m
80 km
1,978 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Yoshioka 5.0 km · Rifu 11 km · Sendai 14 km · Tagajō-shi 14 km · Shiogama 15 km · Matsushima 15 km · Shōbudahama 20 km · Naka-niida 20 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 Tomiya (38.3931°, 140.8861°, elevation 64 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).