Hekinan weather in October

In October, Hekinan sees average daytime highs of 23°C and overnight lows near 15°C, with 179 mm of rain across 10.5 wet days and about 11.1 hours of daylight. It is the 6th-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 44% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of October to 10 h 36 min by month's end. Set against the rest of the year, October is Hekinan's 5th-clearest and 9th-windiest month. For the whole year in context, see Hekinan's year-round climate.

Daytime high
23°
6th warmest
Overnight low
15°
7th coldest
Rainfall
179 mm
10.5 wet days
Daylight
11 h 06 min
6:04 AM – 5:10 PM
Cloud cover
52%
5th clearest
Wind
11 km/h
9th windiest
Solar energy
3.48 kWh/m²
Travel score
6.8
out of 10

Hekinan is city in Aichi prefecture, Japan.

Density
2,021/km²
people per km²
Founded
1948

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

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 October day in Hekinan reaches about 23°C in the afternoon and slips back to 15°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 26°C. Set against its neighbours, October runs about 6°C cooler than September and about 6°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12618
22518
32518
42518
52518
62517
72517
82417
92417
102417
112416
122416
132316
142316
152315
162315
172315
182315
192214
202214
212214
222214
232214
242113
252113
262113
272113
282113
292012
302012
312012

How October really feels in Hekinan

Once humidity and wind are folded in, October 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

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Hekinan weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan10° / 545.79.92.4
Feb11° / 616.310.72.8
Mar14° / 1089.611.74.3
Apr19° / 10°1169.912.96.1
May24° / 15°13810.313.86.7
Jun27° / 20°17813.414.35.7
Jul30° / 24°18614.714.14.3
Aug32° / 25°11012.413.33.9
Sep28° / 21°19312.212.25.4
Oct23° / 15°17910.511.16.8
Nov17° / 847.210.26.0
Dec12° / 565.69.73.7

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 11% of October, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24753
34753
44753
54852
64951
75050
84951
95149
105248
115248
125347
135446
145545
155545
165644
175743
185842
195842
205941
216040
226040
236040
246040
256139
266238
276337
286337
296436
306436
316535

Chance of precipitation in October

Any precipitation

Hekinan gets around 179 mm of rain over 10.5 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 41% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
241
340
440
539
639
738
837
936
1035
1135
1234
1333
1433
1532
1632
1732
1831
1931
2031
2131
2231
2331
2431
2530
2630
2729
2829
2928
3028
3127

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 44% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1172034236
2182134225
3192234214
4202334204
5212434193
6222433183
7232532173
8252631162
9272730142
10292828132
11312927121
12333025111
13353024101
1437302291
1539312181
1642302071
1744301861
1847301761
1950291651
2054281440
2156281330
2258271230
2362251120
2464241020
2565231020
266822910
277120810
287219810
297418710
307617610
317716610

Wind in October

Winds average 11 km/h in October.

Across October, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 42 min at the start of October to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over October. Sunrise moves from 5:51 AM to 6:18 AM, and sunset from 5:31 PM to 4:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.75:515:31
211.65:525:29
311.65:535:28
411.55:545:26
511.55:555:25
611.55:555:24
711.45:565:22
811.45:575:21
911.45:585:19
1011.35:595:18
1111.36:005:17
1211.26:005:15
1311.26:015:14
1411.26:025:13
1511.16:035:12
1611.16:045:10
1711.16:055:09
1811.06:065:08
1911.06:075:07
2011.06:075:05
2110.96:085:04
2210.96:095:03
2310.96:105:02
2410.86:115:01
2510.86:125:00
2610.86:134:59
2710.76:144:58
2810.76:154:57
2910.76:164:56
3010.66:174:55
3110.66:184:54

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.48 kWh/m².

For context, solar energy here swings from a low near 2.57 kWh/m² to a high of 5.54 kWh/m² in May across the year — October's 3.48 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.7Moderate
43.7Moderate
53.7Moderate
63.6Moderate
73.6Moderate
83.6Moderate
93.6Moderate
103.6Moderate
113.6Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.5Moderate
183.5Moderate
193.5Moderate
203.4Moderate
213.4Moderate
223.4Moderate
233.4Moderate
243.4Moderate
253.3Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
313.2Moderate
Planning a trip in October

Hazard calendar for Hekinan

In seasonPeak

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

Hekinan 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 October a good time to visit Hekinan?

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

6.8
Sightseeing
1st-best month of the year
5.1
Beach & pool
6th-best month of the year

October is a reasonable time to visit Hekinan for sightseeing.

What to pack for Hekinan in October

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

In October, Hekinan sees daytime highs around 23°C and nights near 15°C. Worth packing: light clothes and rain gear. About 11 days see rain.

light clothesrain gear

Sea temperature near Hekinan in October

The nearest coast averages about 22°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from May 31 to Nov 9 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Hekinan in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hekinan 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 2 (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 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Hekinan in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Hekinan is worst in April — around 22 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1322 µg/m³Dec 1813 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun19Moderate
Jul15Moderate
Aug14Moderate
Sep14Moderate
Oct15Moderate
Nov15Moderate
Dec13Moderate
Location & terrain

Where is Hekinan?

Hekinan sits at 34.9°N, 137.0°E, 3 m above sea level, in Japan. The nearest listed city is Takahama, 4.0 km away.

Topography around Hekinan

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

Within 3 km, the terrain around Hekinan has only modest variations in elevation — a maximum elevation change of 23 m around an average of 4 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 294 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,696 m.

The land around Hekinan is covered by artificial surfaces (62%) and water (23%) within 3 km, artificial surfaces (37%), cropland (21%) and water (21%) within 16 km, and trees (47%) and water (28%) within 80 km.

3 km
23 m
16 km
294 m
80 km
1,696 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Takahama 4.0 km · Handa 5.0 km · Nishio 6.0 km · Taketoyo 7.0 km · Agui 9.0 km · Ogawa 9.0 km · Ishiki 10 km · Kariya 11 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 Hekinan (34.8833°, 136.9833°, elevation 3 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).