Den’enchōfu weather in September

In September, Den’enchōfu sees average daytime highs of 26°C and overnight lows near 22°C, with 175 mm of rain across 13.4 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 28°C in the first days to 24°C by the end. The sky is clear or mostly clear about 28% of the time in September, and the air most often feels oppressive.

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 Den’enchōfu's 9th-clearest and 8th-windiest month. For the whole year in context, see Den’enchōfu's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
175 mm
13.4 wet days
Daylight
12 h 12 min
5:29 AM – 5:42 PM
Cloud cover
63%
9th clearest
Wind
16 km/h
8th windiest
Solar energy
3.76 kWh/m²
Travel score
6.0
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 24°C by the end.

A typical September day in Den’enchōfu reaches about 26°C in the afternoon and slips back to 22°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 29°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)
12824
22824
32824
42824
52824
62824
72723
82723
92723
102723
112723
122723
132722
142622
152622
162622
172622
182622
192521
202521
212521
222521
232521
242520
252420
262420
272420
282420
292420
302419

How September really feels in Den’enchōfu

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.

Den’enchōfu 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 / 7270.99.92.2
Feb10° / 707.81.410.72.3
Mar13° / 12712.20.611.73.4
Apr17° / 12°11511.8012.95.1
May21° / 16°12811.1013.96.2
Jun24° / 20°16412.7014.46.0
Jul27° / 23°14112.1014.25.8
Aug29° / 25°10210.6013.35.5
Sep26° / 22°17513.4012.26.0
Oct21° / 17°21012.8011.16.2
Nov16° / 11°9710010.15.2
Dec12° / 637.40.19.63.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24654
34654
44654
54654
64555
74654
84654
94654
104555
114555
124555
134456
144456
154357
164357
174258
184258
194258
204060
214060
223961
234060
243961
253961
263961
274060
284060
294060
304060

Chance of precipitation in September

Any precipitation

Den’enchōfu gets around 175 mm of rain over 13.4 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 45% and peaks near 48% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
141
241
342
442
543
643
744
845
945
1046
1146
1247
1347
1447
1547
1648
1748
1848
1947
2047
2147
2246
2346
2446
2546
2645
2746
2846
2946
3046

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 30% of days. Sticky, muggy-or-worse air turns up on roughly 69% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1006234724
2006244722
3017254721
4017254620
5018264619
6019274518
70110274417
80211284316
90212294215
100313294114
111314304012
121415313911
131516313710
14151732369
15161932338
16272032317
17282133296
18292333276
193112433255
203122533234
214132732213
224142832193
235152932172
245163031162
256173131142
266183230121
277193429111
28720352891
29820362781
30921362670

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 16 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
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light 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
2916light breeze
3016light 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 5:17 AM to 5:40 AM, and sunset from 6:05 PM to 5:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:176:05
212.85:186:03
312.75:196:02
412.75:206:00
512.65:205:59
612.65:215:57
712.65:225:56
812.55:235:54
912.55:245:53
1012.55:245:51
1112.45:255:50
1212.45:265:48
1312.35:275:47
1412.35:275:45
1512.35:285:44
1612.25:295:42
1712.25:305:41
1812.15:315:39
1912.15:315:38
2012.15:325:36
2112.05:335:35
2212.05:345:33
2312.05:355:32
2411.95:355:30
2511.95:365:29
2611.85:375:27
2711.85:385:26
2811.85:395:24
2911.75:395:23
3011.75:405:21

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 2.28 kWh/m² to a high of 5.12 kWh/m² in May across the year — September's 3.76 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.3Bright
34.3Bright
44.2Bright
54.2Bright
64.2Bright
74.1Bright
84.1Bright
94.0Bright
104.0Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.8Moderate
153.8Moderate
163.7Moderate
173.7Moderate
183.6Moderate
193.6Moderate
203.5Moderate
213.5Moderate
223.5Moderate
233.4Moderate
243.4Moderate
253.4Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Hazard calendar for Den’enchōfu

In seasonPeak

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

Den’enchōfu 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 Den’enchōfu?

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

6.0
Sightseeing
3rd-best month of the year
5.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Den’enchōfu for sightseeing.

What to pack for Den’enchōfu in September

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

In September, Den’enchōfu sees daytime highs around 26°C and nights near 22°C. Pack rain gear. Worth having: light clothes. About 13 days see rain.

rain gearlight clothes

Sea temperature near Den’enchōfu in September

The nearest coast averages about 25°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 19 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Den’enchōfu 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 Den’enchōfu peaks around July 20 at about 10 (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 20UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Den’enchōfu 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 Den’enchōfu is worst in April — around 26 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1525 µg/m³Dec 1612 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb25Moderate
Mar23Moderate
Apr26Moderate
May21Moderate
Jun18Moderate
Jul13Moderate
Aug12Moderate
Sep12Moderate
Oct14Moderate
Nov14Moderate
Dec12Good
Location & terrain

Where is Den’enchōfu?

Den’enchōfu sits at 35.6°N, 139.7°E, 44 m above sea level, in Japan. The nearest listed city is Ebara, 4.0 km away.

Topography around Den’enchōfu

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

Within 3 km, the terrain around Den’enchōfu has only modest variations in elevation — a maximum elevation change of 50 m around an average of 23 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 137 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,092 m.

The land around Den’enchōfu is covered by artificial surfaces (87%) within 3 km, artificial surfaces (74%) within 16 km, and trees (37%), artificial surfaces (25%) and water (23%) within 80 km.

3 km
50 m
16 km
137 m
80 km
2,092 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ebara 4.0 km · Yōga 4.0 km · Ikegami 4.0 km · Nakanobu 4.0 km · Togoshi 5.0 km · Meguro 5.0 km · Setagaya 5.0 km · Wakabayashi 6.0 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 Den’enchōfu (35.5955°, 139.6653°, elevation 44 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).