Uki weather in September

In September, Uki sees average daytime highs of 26°C and overnight lows near 20°C, with 183 mm of rain across 14.3 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 25°C by the end. The sky is clear or mostly clear about 29% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Uki's 8th-clearest and 12th-windiest month. For the whole year in context, see Uki's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
183 mm
14.3 wet days
Daylight
12 h 12 min
6:06 AM – 6:18 PM
Cloud cover
62%
8th clearest
Wind
7 km/h
12th windiest
Solar energy
4.05 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 28°C in the first days to 25°C by the end.

A typical September day in Uki reaches about 26°C in the afternoon and slips back to 20°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 29°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°35°151015202530
Avg high (°C)Avg low (°C)
12822
22822
32822
42822
52822
62822
72821
82721
92721
102721
112721
122721
132721
142720
152720
162620
172620
182620
192620
202619
212619
222619
232519
242519
252519
262518
272518
282518
292518
302418

How September really feels in Uki

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.

Uki weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 8210.53.210.11.3
Feb / 10210.52.210.81.9
Mar13° / 15113.60.611.83.4
Apr18° / 10°17012.3012.85.3
May22° / 15°19312.5013.76.1
Jun24° / 19°46419.1014.15.1
Jul28° / 23°35819.8013.94.5
Aug29° / 23°17116.9013.24.5
Sep26° / 20°18314.3012.25.9
Oct22° / 14°1089011.26.9
Nov16° / 988.8010.35.2
Dec10° / 86101.49.92.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34258
44258
54159
64159
74159
84258
94258
104357
114456
124555
134555
144654
154654
164753
174753
184852
194753
204852
214951
224951
234951
244951
255050
265050
275050
285050
295050
305050

Chance of precipitation in September

Any precipitation

Uki gets around 183 mm of rain over 14.3 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 56% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
156
255
355
454
554
653
752
852
951
1050
1149
1248
1348
1447
1546
1645
1744
1844
1943
2043
2143
2242
2342
2442
2541
2641
2741
2840
2940
3039

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 34% of days. Sticky, muggy-or-worse air turns up on roughly 61% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1001036531
2011137501
3011238490
4011339470
5021340450
6021440430
7131440410
8141541400
9141640380
10251640360
11261739350
12371839330
13391938310
144102037290
155112036280
166122135260
176142234240
187152333220
198162332210
209172431190
2110182530180
2210192529160
2311202628150
2412212727130
2513222726120
2614222826110
271523282590
281624282480
291725282380
301825282270

Wind in September

Winds average 7 km/h in September, the calmest month.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 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
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 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 60 minutes over September. Sunrise moves from 5:56 AM to 6:15 AM, and sunset from 6:38 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:566:38
212.75:576:37
312.65:576:36
412.65:586:34
512.65:596:33
612.55:596:31
712.56:006:30
812.56:016:29
912.46:016:27
1012.46:026:26
1112.46:026:25
1212.36:036:23
1312.36:046:22
1412.36:046:20
1512.26:056:19
1612.26:066:18
1712.26:066:16
1812.16:076:15
1912.16:086:13
2012.16:086:12
2112.06:096:11
2212.06:106:09
2312.06:106:08
2411.96:116:06
2511.96:126:05
2611.96:126:04
2711.86:136:02
2811.86:146:01
2911.86:146:00
3011.76:155:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.05 kWh/m².

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 5.09 kWh/m² in May across the year — September's 4.05 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.1Bright
194.0Bright
204.0Bright
214.0Bright
224.0Moderate
234.0Moderate
244.0Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Uki

In seasonPeak

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

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

Uki's rainy season runs June–July, 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 Uki?

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

5.9
Sightseeing
3rd-best month of the year
5.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Uki for sightseeing.

What to pack for Uki in September

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

In September, Uki sees daytime highs around 26°C and nights near 20°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Uki in September

The nearest coast averages about 26°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 27 km away) is warmest in August at about 27°C and coldest in February near 14°C.

It's comfortable for a long swim from May 26 to Nov 19 — about 5.9 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb14Bracing
Mar15Bracing
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Refreshing
Dec18Cool

UV index in Uki in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Uki peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJun 22UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr8Very high
May8Very high
Jun10Extreme
Jul10Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Uki 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 Uki is worst in March — around 24 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (July, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2424 µg/m³Jul 2114 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar24Moderate
Apr24Moderate
May22Moderate
Jun18Moderate
Jul13Moderate
Aug14Moderate
Sep14Moderate
Oct14Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Uki?

Uki sits at 32.6°N, 130.7°E, 0 m above sea level, in Japan. The nearest listed city is Matsubase, 3.0 km away.

Topography around Uki

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

Within 3 km, the terrain around Uki has only modest variations in elevation — a maximum elevation change of 98 m around an average of 3 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 861 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,757 m.

The land around Uki is covered by cropland (54%) within 3 km, trees (42%), cropland (22%) and water (20%) within 16 km, and trees (65%) and water (21%) within 80 km.

3 km
98 m
16 km
861 m
80 km
1,757 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Matsubase 3.0 km · Uto 7.0 km · Honmachi 14 km · Mifune 18 km · Kotō 19 km · Shimada 19 km · Kumamoto 21 km · Ōyanomachi-noboritate 22 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 Uki (32.6222°, 130.6618°, elevation 0 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).