Ōno weather in September

In September, Ōno sees average daytime highs of 21°C and overnight lows near 18°C, with 158 mm of rain across 12.8 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 23°C in the first days to 20°C by the end. The sky is clear or mostly clear about 23% 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 Ōno's 9th-clearest and 8th-windiest month. For the whole year in context, see Ōno's year-round climate.

Daytime high
21°
3rd warmest
Overnight low
18°
10th coldest
Rainfall
158 mm
12.8 wet days
Daylight
12 h 18 min
5:20 AM – 5:36 PM
Cloud cover
68%
9th clearest
Wind
13 km/h
8th windiest
Solar energy
3.75 kWh/m²
Travel score
5.9
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 20°C by the end.

A typical September day in Ōno reaches about 21°C in the afternoon and slips back to 18°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 25°C. Set against its neighbours, September runs about 2°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12320
22320
32319
42319
52319
62319
72319
82319
92219
102219
112218
122218
132218
142218
152218
162218
172117
182117
192117
202117
212117
222116
232016
242016
252016
262016
272015
282015
291915
301915

How September really feels in Ōno

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.

Ōno 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°609.78.89.50.0
Feb / -3°578.77.810.40.0
Mar / 8010.96.311.70.4
Apr10° / 8711.51.9132.3
May14° / 10°10011.5014.24.1
Jun18° / 14°10711.5014.85.2
Jul22° / 18°14614.8014.65.7
Aug24° / 20°15214.2013.66.2
Sep21° / 18°15812.8012.35.9
Oct17° / 12°12610.2010.95.3
Nov11° / 639.80.99.82.7
Dec / 63105.89.20.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% 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 63%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13367
23367
33367
43367
53367
63367
73565
83565
93664
103565
113565
123565
133664
143763
153763
163763
173763
183763
193862
203961
213961
224060
234060
244159
254258
264258
274258
284258
294357
304357

Chance of precipitation in September

Any precipitation

Ōno gets around 158 mm of rain over 12.8 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 44% and peaks near 47% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
147
247
347
447
547
647
747
847
947
1047
1147
1247
1347
1447
1546
1646
1745
1844
1944
2043
2142
2241
2341
2440
2540
2640
2739
2839
2939
3038

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 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
12133238151
22143237141
32153337131
42153336121
53163335121
63173435111
74183433100
8520343290
9621343190
10722333080
11823332870
12925332670
131126322560
141327322350
151528312150
161729311940
171930301740
182132291530
192333281430
202533271220
212734261020
22303525920
23323523820
24343622710
25363621610
26393620510
27413618400
28433617300
29463516300
30483415200

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light 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 5:34 AM, and sunset from 6:01 PM to 5:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:056:01
212.95:066:00
312.85:075:58
412.85:085:56
512.85:095:55
612.75:105:53
712.75:115:51
812.65:125:49
912.65:135:48
1012.55:145:46
1112.55:155:44
1212.45:165:43
1312.45:175:41
1412.45:185:39
1512.35:195:37
1612.35:205:36
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
2611.85:305:18
2711.85:315:17
2811.75:325:15
2911.75:335:13
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 3.75 kWh/m².

For context, solar energy here swings from a low near 1.87 kWh/m² to a high of 5.48 kWh/m² in May across the year — September's 3.75 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
293.4Moderate
303.4Moderate
Planning a trip in September

Hazard calendar for Ōno

In seasonPeak

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

Ōno 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 Ōno?

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

5.9
Sightseeing
2nd-best month of the year
3.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Ōno for sightseeing.

What to pack for Ōno in September

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

In September, Ōno sees daytime highs around 21°C and nights near 18°C. Worth packing: rain gear. About 13 days see rain.

rain gear

Sea temperature near Ōno 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 23 km away) is warmest in August at about 21°C and coldest in March near 6°C.

It's comfortable for a long swim from Aug 8 to Sep 25 — about 1.6 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan10Bracing
Feb7Bracing
Mar6Bracing
Apr8Bracing
May10Bracing
Jun14Bracing
Jul18Cool
Aug21Refreshing
Sep21Refreshing
Oct18Cool
Nov15Cool
Dec12Bracing

UV index in Ōno 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 Ōno peaks around August 19 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 1 (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 8Jan 10UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr6High
May8Very high
Jun7Very high
Jul5Moderate
Aug9Very high
Sep7High
Oct5Moderate
Nov2Moderate
Dec1Low

Air quality in Ōno 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 Ōno is worst in March — around 23 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (August, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2323 µg/m³Aug 1012 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb17Moderate
Mar23Moderate
Apr23Moderate
May21Moderate
Jun15Moderate
Jul12Moderate
Aug12Moderate
Sep14Moderate
Oct14Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Ōno?

Ōno sits at 40.3°N, 141.6°E, 211 m above sea level, in Japan. The nearest listed city is Kuji, 16 km away.

Topography around Ōno

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

Within 3 km, the terrain around Ōno has only modest variations in elevation — a maximum elevation change of 240 m around an average of 255 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 736 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,128 m.

The land around Ōno is covered by trees (84%) within 3 km, trees (86%) within 16 km, and trees (63%) and water (29%) within 80 km.

3 km
240 m
16 km
736 m
80 km
2,128 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Kuji 16 km · Hachinohe 26 km · Ninohe 27 km · Nanaku 33 km · Hakurōmachi 38 km · Hitokawame 42 km · Misawa 49 km · Towada 51 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 Ōno (40.2853°, 141.6287°, elevation 211 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).