Yūki weather in September

In September, Yūki sees average daytime highs of 27°C and overnight lows near 20°C, with 164 mm of rain across 14.2 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 29°C in the first days to 24°C by the end. The sky is clear or mostly clear about 19% of the time in September, and the air most often feels muggy.

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 Yūki's 10th-clearest and 5th-windiest month. For the whole year in context, see Yūki's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
164 mm
14.2 wet days
Daylight
12 h 12 min
5:28 AM – 5:42 PM
Cloud cover
69%
10th clearest
Wind
8 km/h
5th windiest
Solar energy
3.6 kWh/m²
Travel score
5.5
out of 10

Yūki is city in Ibaraki Prefecture, Japan.

Density
770/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 29°C in the first days to 24°C by the end.

A typical September day in Yūki reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 31°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°35°151015202530
Avg high (°C)Avg low (°C)
12922
22922
32922
42922
52922
62922
72922
82822
92821
102821
112821
122821
132821
142720
152720
162720
172720
182619
192619
202619
212619
222619
232518
242518
252518
262518
272518
282417
292417
302417

How September really feels in Yūki

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.

Yūki weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°556.11.39.81.9
Feb10° / 546.71.810.62.3
Mar13° / 10011.50.811.73.7
Apr18° / 10711.10.112.95.6
May23° / 14°13412.5013.96.3
Jun26° / 18°14714.6014.45.5
Jul30° / 22°16515.9014.24.4
Aug31° / 23°12313.7013.44.1
Sep27° / 20°16414.2012.25.5
Oct21° / 14°17612.3011.16.2
Nov16° / 808.7010.15.2
Dec11° / 526.50.29.63.1

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 16% of September, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23763
33763
43763
53862
63862
73763
83763
93763
103763
113664
123565
133664
143565
153565
163565
173466
183466
193367
203367
213466
223466
233466
243565
253565
263565
273565
283664
293763
303763

Chance of precipitation in September

Any precipitation

Yūki gets around 164 mm of rain over 14.2 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 48% and peaks near 50% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
148
249
349
450
550
650
750
850
950
1050
1150
1249
1349
1449
1548
1648
1748
1847
1947
2046
2146
2246
2345
2445
2545
2645
2745
2845
2945
3045

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 57% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1021133468
2021133468
3021234457
4021334447
5031435427
6131435416
7141535406
8141635395
9151835375
10161935364
11262034344
12272134323
13382234313
14392433293
154102532262
165112732242
175122831222
186132930201
197143029181
208163128161
219173227141
2210183325121
2311193424111
241220352391
251321362281
261422362161
271523372050
281624371940
291725371830
301826371730

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 8 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
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
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 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 5:16 AM to 5:40 AM, and sunset from 6:04 PM to 5:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:166:04
212.85:176:03
312.75:176:02
412.75:186:00
512.75:195:59
612.65:205:57
712.65:215:55
812.55:225:54
912.55:225:52
1012.55:235:51
1112.45:245:49
1212.45:255:48
1312.35:265:46
1412.35:265:45
1512.35:275:43
1612.25:285:42
1712.25:295:40
1812.15:305:38
1912.15:305:37
2012.15:315:35
2112.05:325:34
2212.05:335:32
2312.05:345:31
2411.95:355:29
2511.95:355:28
2611.85:365:26
2711.85:375:25
2811.85:385:23
2911.75:395:22
3011.75:405:20

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 2.38 kWh/m² to a high of 5.09 kWh/m² in May across the year — September's 3.6 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.0Moderate
44.0Moderate
53.9Moderate
63.9Moderate
73.9Moderate
83.8Moderate
93.8Moderate
103.8Moderate
113.7Moderate
123.7Moderate
133.7Moderate
143.6Moderate
153.6Moderate
163.6Moderate
173.5Moderate
183.5Moderate
193.5Moderate
203.4Moderate
213.4Moderate
223.4Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.2Moderate
273.2Moderate
283.2Moderate
293.2Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Yūki?

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

5.5
Sightseeing
4th-best month of the year
5.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Yūki for sightseeing.

What to pack for Yūki in September

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

In September, Yūki sees daytime highs around 27°C and nights near 20°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Yūki 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 67 km away) is warmest in August at about 24°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 24 to Oct 28 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun19Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Yūki in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yūki peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 highModerateJul 17UV 9Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Yūki 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 Yūki is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2425 µg/m³Dec 1914 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar25Moderate
Apr25Moderate
May24Moderate
Jun19Moderate
Jul16Moderate
Aug15Moderate
Sep15Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Yūki?

Yūki sits at 36.3°N, 139.9°E, 40 m above sea level, in Japan. The nearest listed city is Oyama, 7.0 km away.

Topography around Yūki

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

Within 3 km, the terrain around Yūki has only modest variations in elevation — a maximum elevation change of 33 m around an average of 36 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 155 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,553 m.

The land around Yūki is covered by artificial surfaces (44%) and cropland (38%) within 3 km, cropland (54%) and artificial surfaces (28%) within 16 km, and trees (45%), artificial surfaces (24%) and cropland (21%) within 80 km.

3 km
33 m
16 km
155 m
80 km
2,553 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Oyama 7.0 km · Shimodate 9.0 km · Chikusei 9.0 km · Shimotsuke 13 km · Yachiyo 13 km · Mibu 15 km · Shimo-tsuma 15 km · Kaminokawa 15 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 Yūki (36.3°, 139.8833°, elevation 40 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. 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).