Aomori weather in September

In September, Aomori sees average daytime highs of 23°C and overnight lows near 15°C, with 145 mm of rain across 13 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 20°C by the end. The sky is clear or mostly clear about 19% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Aomori's 6th-clearest and 9th-windiest month. For the whole year in context, see Aomori's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
145 mm
13 wet days
Daylight
12 h 18 min
5:23 AM – 5:39 PM
Cloud cover
69%
6th clearest
Wind
9 km/h
9th windiest
Solar energy
3.76 kWh/m²
Travel score
6.0
out of 10

Aomori is city in Aomori Prefecture, Japan.

Density
362/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 25°C in the first days to 20°C by the end.

A typical September day in Aomori reaches about 23°C in the afternoon and slips back to 15°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 26°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)
12518
22518
32518
42518
52518
62417
72417
82417
92417
102417
112416
122316
132316
142316
152315
162315
172215
182215
192214
202214
212214
222114
232113
242113
252113
262013
272013
282012
292012
302012

How September really feels in Aomori

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.

Aomori 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° / -6°6513.218.39.40.0
Feb / -5°651315.610.40.0
Mar / -2°8615.111.711.70.3
Apr12° / 8613.52.713.13.0
May18° / 10112.90.114.25.3
Jun21° / 14°10412.4014.95.9
Jul25° / 18°15815.4014.65.8
Aug26° / 20°16915.5013.65.7
Sep23° / 15°14513012.36.0
Oct16° / 112130.110.94.7
Nov / 8714.64.79.71.7
Dec / -3°8214.6159.10.0

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 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13169
23169
33169
43169
53169
63268
73268
83169
93367
103466
113466
123466
133466
143664
153565
163664
173763
183664
193763
203763
213862
223862
233961
243862
253862
263862
273862
283961
293961
303961

Chance of precipitation in September

Any precipitation

Aomori gets around 145 mm of rain over 13 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 44% and peaks near 49% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
149
249
349
449
548
648
747
847
946
1046
1146
1245
1345
1444
1543
1643
1742
1842
1941
2041
2141
2241
2341
2442
2542
2642
2742
2843
2943
3043

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 18% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1418352914
2419362813
3520362712
4520372611
5621372510
672237259
782337238
8102437227
9112536216
10132535206
11152635195
12182734184
13202732173
14232831163
15252830152
16282928132
17312926121
18342925111
19373023101
2039302291
2142302071
2244301960
2347301750
2449301640
2551301540
2654301330
2756301220
2858291120
2961281010
306327910

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 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
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:08 AM to 5:38 AM, and sunset from 6:05 PM to 5:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:086:05
212.95:096:04
312.95:106:02
412.85:116:00
512.85:125:59
612.75:135:57
712.75:145:55
812.65:155:53
912.65:165:52
1012.55:175:50
1112.55:185:48
1212.55:195:46
1312.45:205:45
1412.45:215:43
1512.35:225:41
1612.35:235:39
1712.25:245:38
1812.25:255:36
1912.15:265:34
2012.15:275:32
2112.05:285:31
2212.05:305:29
2311.95:315:27
2411.95:325:25
2511.85:335:24
2611.85:345:22
2711.85:355:20
2811.75:365:18
2911.75:375:17
3011.65:385:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.76 kWh/m².

For context, solar energy here swings from a low near 1.77 kWh/m² to a high of 5.5 kWh/m² in May across the year — September's 3.76 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.0Bright
34.0Bright
44.0Moderate
54.0Moderate
63.9Moderate
73.9Moderate
83.9Moderate
93.9Moderate
103.8Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.7Moderate
163.7Moderate
173.7Moderate
183.7Moderate
193.7Moderate
203.6Moderate
213.6Moderate
223.6Moderate
233.6Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.4Moderate
293.4Moderate
303.4Moderate
Planning a trip in September

Hazard calendar for Aomori

In seasonPeak

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

Aomori 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 Aomori?

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

6.0
Sightseeing
1st-best month of the year
4.3
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Aomori for sightseeing.

What to pack for Aomori in September

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

In September, Aomori sees daytime highs around 23°C and nights near 15°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near Aomori in September

The nearest coast averages about 22°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 14 km away) is warmest in August at about 23°C and coldest in March near 8°C.

It's comfortable for a long swim from Jul 24 to Oct 7 — about 2.5 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan10Bracing
Feb8Bracing
Mar8Bracing
Apr8Bracing
May11Bracing
Jun15Cool
Jul19Cool
Aug23Refreshing
Sep22Refreshing
Oct19Cool
Nov15Cool
Dec12Bracing

UV index in Aomori in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Aomori peaks around August 19 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighVery highHighModerateLowAug 19UV 8Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar3Moderate
Apr6High
May8Very high
Jun8Very high
Jul5Moderate
Aug9Very high
Sep7High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Aomori 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 Aomori is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1421 µg/m³Dec 1510 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar20Moderate
Apr21Moderate
May19Moderate
Jun14Moderate
Jul12Moderate
Aug12Good
Sep12Good
Oct12Good
Nov10Good
Dec10Good
Location & terrain

Where is Aomori?

Aomori sits at 40.8°N, 140.7°E, 7 m above sea level, in Japan. The nearest listed city is Namioka, 17 km away.

Topography around Aomori

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

Within 3 km, the terrain around Aomori has only modest variations in elevation — a maximum elevation change of 60 m around an average of 7 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 859 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,715 m.

The land around Aomori is covered by artificial surfaces (71%) within 3 km, trees (61%) and water (23%) within 16 km, and trees (52%) and water (39%) within 80 km.

3 km
60 m
16 km
859 m
80 km
1,715 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Namioka 17 km · Kuroishi 23 km · Goshogawara 25 km · Tsugaru 28 km · Hirakawa 29 km · Shimokizukuri 30 km · Hirosaki 33 km · Toyota 44 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 Aomori (40.8167°, 140.7333°, elevation 7 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).