Date weather in September

In September, Date sees average daytime highs of 23°C and overnight lows near 16°C, with 169 mm of rain across 14.3 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 21°C by the end. The sky is clear or mostly clear about 16% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Date's 9th-clearest and 9th-windiest month. For the whole year in context, see Date's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
169 mm
14.3 wet days
Daylight
12 h 12 min
5:25 AM – 5:40 PM
Cloud cover
72%
9th clearest
Wind
7 km/h
9th windiest
Solar energy
3.51 kWh/m²
Travel score
5.8
out of 10

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 21°C by the end.

A typical September day in Date reaches about 23°C in the afternoon and slips back to 16°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 28°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12619
22619
32619
42519
52519
62518
72518
82518
92518
102418
112418
122417
132417
142417
152417
162316
172316
182316
192316
202316
212215
222215
232215
242215
252114
262114
272114
282114
292114
302113

How September really feels in Date

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.

Date 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 / -4°641110.69.70.0
Feb / -3°519.58.210.50.0
Mar / -1°9012.26.611.71.2
Apr14° / 9911.91.612.93.9
May19° / 10°10611.90145.8
Jun22° / 15°13314.3014.65.7
Jul26° / 19°19318.5014.45.1
Aug27° / 20°16316.5013.55.4
Sep23° / 16°16914.3012.35.8
Oct18° / 10°14411.30115.4
Nov12° / 679.30.9103.1
Dec / -1°5511.17.19.40.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% 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 69%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13169
23169
33070
43070
53070
63070
73169
83169
93169
103169
113169
123169
133169
143169
153070
163070
173070
183070
192971
202971
212971
223070
233169
243268
253169
263169
273268
283268
293268
303367

Chance of precipitation in September

Any precipitation

Date gets around 169 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 48% and peaks near 52% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
152
252
352
452
552
652
752
852
952
1051
1151
1251
1350
1450
1549
1649
1748
1848
1947
2046
2145
2245
2344
2444
2543
2643
2743
2842
2942
3042

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

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

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1110323819
2110333818
3110353816
4211353715
5212353614
6313363613
7314363512
8415363411
9516353310
1061835329
1171935318
1292034307
13102134296
14122333275
15142432254
16162532234
17182731223
18202830202
19222929182
20253027162
21273126151
22293225131
23313324111
24333323101
2535342181
2637352070
2739361960
2840371750
2942371640
3044381540

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
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 54 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 72 minutes over September. Sunrise moves from 5:12 AM to 5:38 AM, and sunset from 6:03 PM to 5:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:126:03
212.85:136:02
312.85:146:00
412.75:155:59
512.75:165:57
612.75:165:56
712.65:175:54
812.65:185:52
912.55:195:51
1012.55:205:49
1112.45:215:48
1212.45:225:46
1312.45:235:44
1412.35:235:43
1512.35:245:41
1612.25:255:40
1712.25:265:38
1812.25:275:36
1912.15:285:35
2012.15:295:33
2112.05:305:31
2212.05:305:30
2311.95:315:28
2411.95:325:27
2511.95:335:25
2611.85:345:23
2711.85:355:22
2811.75:365:20
2911.75:375:19
3011.75:385:17

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.51 kWh/m².

For context, solar energy here swings from a low near 2.12 kWh/m² to a high of 5.36 kWh/m² in May across the year — September's 3.51 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.8Moderate
33.8Moderate
43.8Moderate
53.7Moderate
63.7Moderate
73.7Moderate
83.6Moderate
93.6Moderate
103.6Moderate
113.6Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.4Moderate
223.3Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.3Moderate
273.2Moderate
283.2Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Hazard calendar for Date

In seasonPeak

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

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

Date's rainy season runs March–October, 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 Date?

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

5.8
Sightseeing
1st-best month of the year
4.6
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Date for sightseeing.

What to pack for Date in September

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

In September, Date sees daytime highs around 23°C and nights near 16°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Date in September

The nearest coast averages about 23°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 55 km away) is warmest in August at about 24°C and coldest in March near 9°C.

It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb9Bracing
Mar9Bracing
Apr11Bracing
May14Bracing
Jun18Cool
Jul21Refreshing
Aug24Refreshing
Sep23Refreshing
Oct19Cool
Nov17Cool
Dec14Bracing

UV index in Date in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Date peaks around August 13 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 13UV 10Jan 10UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Date 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 Date 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 1721 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar20Moderate
Apr21Moderate
May20Moderate
Jun16Moderate
Jul14Moderate
Aug12Good
Sep11Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Date?

Date sits at 37.8°N, 140.5°E, 58 m above sea level, in Japan. The nearest listed city is Hobaramachi, 4.0 km away.

Topography around Date

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

Within 3 km, the terrain around Date has significant variations in elevation — a maximum elevation change of 310 m around an average of 76 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 887 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,110 m.

The land around Date is covered by trees (36%), artificial surfaces (33%) and cropland (23%) within 3 km, trees (75%) within 16 km, and trees (68%) within 80 km.

3 km
310 m
16 km
887 m
80 km
2,110 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hobaramachi 4.0 km · Fukushima 8.0 km · Yanagawamachi-saiwaichō 10 km · Shiroishi 23 km · Nihommatsu 27 km · Kakuda 30 km · Ōkawara 33 km · Takahata 34 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 Date (37.8167°, 140.5°, elevation 58 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).