Uwajima weather in September

In September, Uwajima sees average daytime highs of 28°C and overnight lows near 21°C, with 178 mm of rain across 12.7 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 30°C in the first days to 26°C by the end. The sky is clear or mostly clear about 34% of the time in September, and the air most often feels oppressive.

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 Uwajima's 7th-clearest and 11th-windiest month. For the whole year in context, see Uwajima's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
178 mm
12.7 wet days
Daylight
12 h 12 min
5:58 AM – 6:10 PM
Cloud cover
59%
7th clearest
Wind
10 km/h
11th windiest
Solar energy
4.24 kWh/m²
Travel score
5.5
out of 10

Uwajima is city in Ehime Prefecture, Japan.

Density
151/km²
people per km²
Founded
2005

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 30°C in the first days to 26°C by the end.

A typical September day in Uwajima reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 31°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13023
23023
33023
43023
53023
63023
73023
83022
92922
102922
112922
122922
132922
142922
152921
162821
172821
182821
192821
202820
212820
222720
232720
242720
252720
262719
272719
282619
292619
302619

How September really feels in Uwajima

Once humidity and wind are folded in, September averages 6 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
6
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Uwajima 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
Jan10° / 608.61.110.12.5
Feb11° / 748.90.810.82.9
Mar15° / 11211.10.111.74.4
Apr19° / 11°12910.4012.86.1
May24° / 16°15010.4013.76.7
Jun26° / 20°27315.4014.25.5
Jul30° / 24°20113.80144.5
Aug31° / 24°13712.8013.24.0
Sep28° / 21°17812.7012.25.5
Oct23° / 16°1418.7011.27.2
Nov18° / 10°837.9010.36.2
Dec13° / 748.80.39.83.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% 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 50%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
25050
34852
44852
54852
64852
74951
84753
94753
104852
114951
124852
134951
144951
154951
165050
175050
185050
195050
205050
215149
225149
235248
245248
255248
265248
275347
285446
295446
305446

Chance of precipitation in September

Any precipitation

Uwajima gets around 178 mm of rain over 12.7 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 41% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
144
245
345
445
544
644
744
844
944
1044
1143
1243
1342
1442
1541
1641
1740
1840
1940
2040
2139
2239
2339
2439
2539
2638
2738
2838
2938
3038

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 66% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1027235513
2028255312
3028265311
4039275110
50310285010
6131029499
7141129478
8141230467
9151330457
10151430436
11261530416
12271630405
13371730385
14381830364
15491929354
165102029334
175112128313
186122228303
197132327283
207132426272
218142526252
228152625232
239162625222
249172724202
2510182824192
2610182924181
2711193023161
2811203023151
2912213022141
3012213122131

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 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
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 5:48 AM to 6:08 AM, and sunset from 6:31 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:486:31
212.75:486:30
312.75:496:28
412.65:506:27
512.65:516:26
612.65:516:24
712.55:526:23
812.55:536:21
912.45:536:20
1012.45:546:19
1112.45:556:17
1212.35:556:16
1312.35:566:14
1412.35:576:13
1512.25:576:12
1612.25:586:10
1712.25:596:09
1812.15:596:07
1912.16:006:06
2012.16:016:04
2112.06:016:03
2212.06:026:02
2312.06:036:00
2411.96:045:59
2511.96:045:57
2611.96:055:56
2711.86:065:55
2811.86:065:53
2911.76:075:52
3011.76:085:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.24 kWh/m².

For context, solar energy here swings from a low near 2.47 kWh/m² to a high of 5.46 kWh/m² in May across the year — September's 4.24 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.1Bright
254.0Bright
264.0Bright
274.0Bright
284.0Moderate
294.0Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Uwajima

In seasonPeak

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

Uwajima 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 Uwajima?

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

5.5
Sightseeing
5th-best month of the year
6.4
Beach & pool
1st-best month of the year

September is a reasonable time to visit Uwajima for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Uwajima in September

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

In September, Uwajima sees daytime highs around 28°C and nights near 21°C. Pack light clothes. Worth having: rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near Uwajima 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 20 km away) is warmest in August at about 27°C and coldest in February near 16°C.

It's comfortable for a long swim from May 25 to Dec 3 — about 6.3 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan17Cool
Feb16Cool
Mar16Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov21Refreshing
Dec19Cool

UV index in Uwajima 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 Uwajima 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 — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJun 22UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May8Very high
Jun10Extreme
Jul10Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Uwajima 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 Uwajima is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1420 µg/m³Oct 1410 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb15Moderate
Mar19Moderate
Apr20Moderate
May18Moderate
Jun15Moderate
Jul11Good
Aug11Good
Sep10Good
Oct10Good
Nov11Good
Dec10Good
Location & terrain

Where is Uwajima?

Uwajima sits at 33.2°N, 132.6°E, 6 m above sea level, in Japan. The nearest listed city is Uwa, 16 km away.

Topography around Uwajima

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

Within 3 km, the terrain around Uwajima has significant variations in elevation — a maximum elevation change of 528 m around an average of 81 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,219 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,895 m.

The land around Uwajima is covered by trees (64%) and artificial surfaces (22%) within 3 km, trees (70%) and water (23%) within 16 km, and water (59%) and trees (39%) within 80 km.

3 km
528 m
16 km
1,219 m
80 km
1,895 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Uwa 16 km · Yawatahama 29 km · Mishōhirajō 29 km · Ōzu 31 km · Sukumo 36 km · Uchiko 37 km · Nakamura 44 km · Shimoda 50 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 Uwajima (33.2238°, 132.56°, elevation 6 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).