Awaji weather in September

In September, Awaji sees average daytime highs of 26°C and overnight lows near 23°C, with 190 mm of rain across 12.1 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 27°C in the first days to 24°C by the end. The sky is clear or mostly clear about 37% 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 Awaji's 6th-clearest and 8th-windiest month. For the whole year in context, see Awaji's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
23°
10th coldest
Rainfall
190 mm
12.1 wet days
Daylight
12 h 12 min
5:48 AM – 6:01 PM
Cloud cover
58%
6th clearest
Wind
16 km/h
8th windiest
Solar energy
4.34 kWh/m²
Travel score
6.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 27°C in the first days to 24°C by the end.

A typical September day in Awaji reaches about 26°C in the afternoon and slips back to 23°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12825
22725
32725
42724
52724
62724
72724
82724
92724
102724
112724
122623
132623
142623
152623
162623
172623
182622
192622
202522
212522
222522
232522
242521
252521
262521
272421
282421
292421
302420

How September really feels in Awaji

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.

Awaji 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 / 7612.20.5101.9
Feb10° / 7810.70.710.72.0
Mar12° / 11311.9011.73.3
Apr16° / 12°12410.2012.85.1
May20° / 17°14610013.86.2
Jun23° / 20°19612.4014.36.0
Jul26° / 24°17812014.16.2
Aug28° / 26°1029.4013.36.3
Sep26° / 23°19012.1012.26.4
Oct22° / 18°17010.1011.16.7
Nov17° / 13°918.5010.25.5
Dec12° / 8411.60.19.73.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
35149
45149
55149
65149
75149
85050
95149
105149
115149
125149
135149
145149
155149
165149
175149
185050
195050
205050
214951
225050
235050
245050
255050
265050
275149
285149
295149
305149

Chance of precipitation in September

Any precipitation

Awaji gets around 190 mm of rain over 12.1 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 40% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
139
240
341
441
542
642
742
842
942
1042
1141
1241
1340
1440
1540
1639
1739
1839
1939
2039
2139
2239
2339
2439
2539
2639
2739
2840
2940
3040

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 68% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1005224329
2016234327
3016254326
4017264224
5018274222
6029284120
70210294119
80211304017
90312313915
100412323814
110414333712
120515333611
13161633359
14171733338
15181933327
16192033306
172102233295
182112333274
193122433253
203132532243
214142732222
224152831202
235162930191
246173029171
256173128161
267183228141
278193327131
288203426110
299213425100
301022352490

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2917light breeze
3017light breeze

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 5:37 AM to 5:59 AM, and sunset from 6:23 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:376:23
212.75:386:21
312.75:396:20
412.65:396:18
512.65:406:17
612.65:416:16
712.55:426:14
812.55:426:13
912.55:436:11
1012.45:446:10
1112.45:456:08
1212.45:456:07
1312.35:466:05
1412.35:476:04
1512.25:486:02
1612.25:486:01
1712.25:495:59
1812.15:505:58
1912.15:505:57
2012.15:515:55
2112.05:525:54
2212.05:535:52
2312.05:535:51
2411.95:545:49
2511.95:555:48
2611.85:565:46
2711.85:565:45
2811.85:575:43
2911.75:585:42
3011.75:595:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.34 kWh/m².

For context, solar energy here swings from a low near 2.43 kWh/m² to a high of 5.61 kWh/m² in May across the year — September's 4.34 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.6Bright
114.5Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.4Bright
174.3Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.2Bright
234.1Bright
244.1Bright
254.0Bright
264.0Bright
274.0Moderate
284.0Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Awaji

In seasonPeak

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

Awaji 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 Awaji?

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

6.4
Sightseeing
2nd-best month of the year
6.1
Beach & pool
3rd-best month of the year

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

What to pack for Awaji in September

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

In September, Awaji sees daytime highs around 26°C and nights near 23°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Awaji 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 13 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 Jun 5 to Nov 16 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr16Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Awaji 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 Awaji peaks around July 10 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 10UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Awaji 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 Awaji is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1625 µg/m³Oct 1914 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar24Moderate
Apr26Moderate
May24Moderate
Jun21Moderate
Jul22Moderate
Aug24Moderate
Sep17Moderate
Oct14Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Awaji?

Awaji sits at 34.5°N, 134.9°E, 203 m above sea level, in Japan. The nearest listed city is Sumoto, 15 km away.

Topography around Awaji

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

Within 3 km, the terrain around Awaji has significant variations in elevation — a maximum elevation change of 529 m around an average of 169 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 529 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,346 m.

The land around Awaji is covered by trees (66%) and water (21%) within 3 km, water (69%) and trees (23%) within 16 km, and trees (45%) and water (36%) within 80 km.

3 km
529 m
16 km
529 m
80 km
1,346 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Sumoto 15 km · Akashi 21 km · Minamiawaji 27 km · Higashinozoe 27 km · Inami 30 km · Fukura 31 km · Kobe 33 km · Hannan 33 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 Awaji (34.4777°, 134.9307°, elevation 203 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).