Hekinan weather in April

In April, Hekinan sees average daytime highs of 19°C and overnight lows near 10°C, with 116 mm of rain across 9.9 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 17°C in the first days to 21°C by the end. The sky is clear or mostly clear about 36% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 18 min at the start of April to 13 h 24 min by month's end. Set against the rest of the year, April is Hekinan's 7th-clearest and 4th-windiest month. For the whole year in context, see Hekinan's year-round climate.

Daytime high
19°
7th warmest
Overnight low
10°
6th coldest
Rainfall
116 mm
9.9 wet days
Daylight
12 h 54 min
5:26 AM – 6:19 PM
Cloud cover
57%
7th clearest
Wind
14 km/h
4th windiest
Solar energy
5.27 kWh/m²
Travel score
6.1
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 April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 17°C in the first days to 21°C by the end.

A typical April day in Hekinan reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 23°C. Set against its neighbours, April runs about 5°C warmer than March and about 4°C cooler than May.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
1177
2177
3178
4178
5178
6188
7188
8189
9189
10189
11199
12199
131910
141910
151910
161910
172010
182011
192011
202011
212011
222011
232112
242112
252112
262112
272112
282112
292113
302213

How April really feels in Hekinan

Once humidity and wind are folded in, April 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

April 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 April compares with the rest of the year at a glance. April is the 7th-warmest and 6th-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 April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25248
35248
45149
55149
65149
75248
85149
95149
105149
115149
125050
134951
144951
154951
164951
174852
184852
194852
204951
214753
224753
234753
244852
254852
264852
274852
284852
294852
304852

Chance of precipitation in April

Any precipitation

Hekinan gets around 116 mm of rain over 9.9 wet days in April. 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 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
133
233
333
433
533
633
734
834
934
1034
1134
1234
1335
1435
1535
1635
1735
1835
1934
2034
2134
2233
2333
2433
2532
2632
2731
2831
2931
3031

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the dry band about 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
196310
295410
395410
495410
594510
694510
793610
893610
993610
1092710
1192710
1292710
1392710
1490811
1590811
1689821
1788921
1888921
19871021
20871021
21851131
22841231
23831331
24811531
25791641
26781741
27761851
28751951
29732061
30722161

Wind in April

Winds average 14 km/h in April.

Across April, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 18 min at the start of April to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over April. Sunrise moves from 5:47 AM to 5:09 AM, and sunset from 6:07 PM to 6:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:476:07
212.45:456:07
312.45:446:08
412.45:436:09
512.55:416:10
612.55:406:11
712.55:386:11
812.65:376:12
912.65:366:13
1012.75:346:14
1112.75:336:15
1212.75:316:15
1312.85:306:16
1412.85:296:17
1512.85:276:18
1612.95:266:19
1712.95:256:19
1812.95:236:20
1913.05:226:21
2013.05:216:22
2113.15:206:23
2213.15:186:23
2313.15:176:24
2413.25:166:25
2513.25:156:26
2613.25:136:27
2713.35:126:28
2813.35:116:28
2913.35:106:29
3013.45:096:30

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.27 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 — April's 5.27 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in April

Hazard calendar for Hekinan

In seasonPeak

In April, 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 April a good time to visit Hekinan?

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

6.1
Sightseeing
3rd-best month of the year
2.8
Beach & pool
7th-best month of the year

April is a reasonable time to visit Hekinan for sightseeing.

What to pack for Hekinan in April

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

In April, Hekinan sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Hekinan in April

The nearest coast averages about 15°C in April — 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 April

LowModerateHighVery highExtreme

Clear-sky midday UV in April 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 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 April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April 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
April 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).