Ono weather in September

In September, Ono sees average daytime highs of 23°C and overnight lows near 16°C, with 248 mm of rain across 15.4 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 2nd-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 22% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Ono's 7th-clearest and 9th-windiest month. For the whole year in context, see Ono's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
248 mm
15.4 wet days
Daylight
12 h 12 min
5:42 AM – 5:55 PM
Cloud cover
68%
7th clearest
Wind
7 km/h
9th windiest
Solar energy
4 kWh/m²
Travel score
5.7
out of 10

Ono is city in Fukui Prefecture, Japan.

Density
39/km²
people per km²
Founded
1954

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 Ono reaches about 23°C in the afternoon and slips back to 16°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 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12619
22518
32518
42518
52518
62518
72518
82518
92417
102417
112417
122417
132417
142416
152316
162316
172316
182316
192315
202215
212215
222215
232214
242214
252114
262114
272114
282113
292113
302113

How September really feels in Ono

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.

Ono 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 / -5°18021.820.69.80.0
Feb / -5°14617.415.510.60.0
Mar / -2°18417.110.411.70.7
Apr13° / 17514.22.912.93.3
May18° / 10°19214.40.113.95.3
Jun22° / 15°24315.4014.45.4
Jul26° / 19°32119.5014.25.1
Aug27° / 20°19417.2013.45.4
Sep23° / 16°24815.4012.25.7
Oct18° / 10°18913.30.111.15.2
Nov11° / 16115.33.410.12.5
Dec / -2°18720.615.39.60.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33961
43961
53961
63961
73862
83862
93862
103862
113862
123763
133763
143862
153862
163664
173664
183664
193763
203664
213664
223664
233664
243664
253763
263763
273862
283862
293862
303862

Chance of precipitation in September

Any precipitation

Ono gets around 248 mm of rain over 15.4 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 52% and peaks near 54% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
154
254
354
454
554
654
754
854
954
1054
1154
1254
1353
1453
1553
1652
1752
1851
1951
2051
2150
2250
2349
2449
2548
2648
2747
2847
2947
3046

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 31% of days. Sticky, muggy-or-worse air turns up on roughly 28% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
121032515
221033505
321134484
431235474
531335454
631436433
741536423
841737403
951837382
1061937362
1172037342
1282237331
1392336311
14102436291
15122635271
16142734251
17152833230
18172932210
19193031190
20223130170
21243229150
22263328140
23283326120
24313425110
2533342490
2635352280
2737352170
2839352060
2941351850
3044351740

Wind in September

Winds average 7 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.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:30 AM to 5:53 AM, and sunset from 6:18 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:306:18
212.85:316:16
312.75:316:15
412.75:326:13
512.65:336:12
612.65:346:10
712.65:356:09
812.55:356:07
912.55:366:06
1012.55:376:04
1112.45:386:03
1212.45:386:01
1312.35:396:00
1412.35:405:58
1512.35:415:57
1612.25:425:55
1712.25:425:54
1812.15:435:52
1912.15:445:50
2012.15:455:49
2112.05:465:47
2212.05:465:46
2312.05:475:44
2411.95:485:43
2511.95:495:41
2611.85:505:40
2711.85:515:38
2811.85:515:37
2911.75:525:35
3011.75:535:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4 kWh/m².

For context, solar energy here swings from a low near 2.14 kWh/m² to a high of 5.51 kWh/m² in May across the year — September's 4 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.3Bright
74.2Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.1Bright
134.0Bright
144.0Bright
154.0Moderate
164.0Moderate
173.9Moderate
183.9Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.8Moderate
233.8Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Ono

In seasonPeak

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

Ono 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 Ono?

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

5.7
Sightseeing
1st-best month of the year
4.4
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Ono for sightseeing.

What to pack for Ono in September

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

In September, Ono sees daytime highs around 23°C and nights near 16°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Ono in September

The nearest coast averages about 25°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 27°C and coldest in March near 11°C.

It's comfortable for a long swim from Jun 16 to Nov 5 — about 4.7 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar11Bracing
Apr13Bracing
May16Cool
Jun20Refreshing
Jul24Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Ono in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ono peaks around July 17 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 17UV 10Jan 10UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Very high
Jul10Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Ono 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 Ono is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1620 µg/m³Dec 1310 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr20Moderate
May19Moderate
Jun17Moderate
Jul13Moderate
Aug12Good
Sep11Good
Oct10Good
Nov11Good
Dec10Good
Location & terrain

Where is Ono?

Ono sits at 36.0°N, 136.5°E, 175 m above sea level, in Japan. The nearest listed city is Katsuyama, 9.0 km away.

Topography around Ono

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

Within 3 km, the terrain around Ono has large variations in elevation — a maximum elevation change of 720 m around an average of 222 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,577 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,671 m.

The land around Ono is covered by cropland (38%), trees (28%) and artificial surfaces (28%) within 3 km, trees (85%) within 16 km, and trees (62%) and water (25%) within 80 km.

3 km
720 m
16 km
1,577 m
80 km
2,671 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Katsuyama 9.0 km · Iijima 17 km · Fukui-shi 26 km · Maruoka 27 km · Sabae 27 km · Takefu 30 km · Echizen 30 km · Sakai 32 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 Ono (35.9811°, 136.4873°, elevation 175 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).