Iwata weather in April

In April, Iwata sees average daytime highs of 19°C and overnight lows near 10°C, with 165 mm of rain across 11.1 wet days and about 12.8 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 35% 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 18 min by month's end. Set against the rest of the year, April is Iwata's 7th-clearest and 5th-windiest month. For the whole year in context, see Iwata's year-round climate.

Daytime high
19°
7th warmest
Overnight low
10°
6th coldest
Rainfall
165 mm
11.1 wet days
Daylight
12 h 54 min
5:23 AM – 6:15 PM
Cloud cover
58%
7th clearest
Wind
13 km/h
5th windiest
Solar energy
5.12 kWh/m²
Travel score
5.9
out of 10

Iwata is city in Shizuoka prefecture, Japan.

Founded
2005

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 Iwata 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°15°20°25°151015202530
Avg high (°C)Avg low (°C)
1178
2178
3178
4178
5179
6189
7189
8189
9189
10189
111810
121910
131910
141910
151910
161911
171911
181911
192011
202011
212011
222012
232012
242012
252012
262112
272112
282113
292113
302113

How April really feels in Iwata

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.

Iwata 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 daysSnow daysDaylight (hours)Travel score
Jan10° / 705.90.19.92.7
Feb11° / 896.90.510.73.1
Mar14° / 14810.80.111.74.3
Apr19° / 10°16511.1012.85.9
May23° / 15°18412013.86.4
Jun26° / 20°25815.7014.35.4
Jul30° / 24°27316.9014.14.2
Aug31° / 25°15716.2013.33.8
Sep28° / 22°24715.8012.25.1
Oct23° / 16°21612.5011.16.4
Nov18° / 10°1229.2010.25.9
Dec13° / 716.609.73.9

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% 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 52%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25248
35248
45149
55149
65149
75149
85050
95149
105149
115050
124951
134951
144852
154852
164852
174852
184852
194852
204753
214753
224753
234753
244555
254654
264555
274555
284555
294456
304456

Chance of precipitation in April

Any precipitation

Iwata gets around 165 mm of rain over 11.1 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 37% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
337
437
537
637
737
837
937
1037
1138
1238
1338
1438
1538
1638
1738
1838
1938
2038
2138
2237
2337
2437
2536
2636
2736
2835
2935
3035

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 (%)
195410
295410
395410
494510
594510
693610
793610
893610
993610
1092710
1192710
1292710
1392710
1490811
1589821
1689821
1788921
1888921
19861031
20851131
21841231
22821341
23801541
24791641
25771751
26761851
27741961
28732061
29712171
30702271

Wind in April

Winds average 13 km/h in April.

Across April, daily wind ranges from about 13 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
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in April

DaylightNight

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

Days grow by about 60 minutes over April. Sunrise moves from 5:43 AM to 5:06 AM, and sunset from 6:03 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:436:03
212.45:426:04
312.45:416:05
412.45:396:05
512.55:386:06
612.55:366:07
712.55:356:08
812.65:346:09
912.65:326:09
1012.75:316:10
1112.75:296:11
1212.75:286:12
1312.85:276:13
1412.85:256:13
1512.85:246:14
1612.95:236:15
1712.95:216:16
1812.95:206:17
1913.05:196:17
2013.05:186:18
2113.05:166:19
2213.15:156:20
2313.15:146:21
2413.15:136:21
2513.25:116:22
2613.25:106:23
2713.25:096:24
2813.35:086:25
2913.35:076:25
3013.35:066:26

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.12 kWh/m².

For context, solar energy here swings from a low near 2.63 kWh/m² to a high of 5.38 kWh/m² in May across the year — April's 5.12 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in April

Hazard calendar for Iwata

In seasonPeak

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

Iwata 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 Iwata?

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

5.9
Sightseeing
3rd-best month of the year
2.6
Beach & pool
7th-best month of the year

April is a reasonable time to visit Iwata for sightseeing.

What to pack for Iwata in April

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

In April, Iwata sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Iwata in April

The nearest coast averages about 17°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 16°C.

It's comfortable for a long swim from May 25 to Nov 29 — about 6.2 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb16Cool
Mar16Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec19Cool

UV index in Iwata 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 Iwata peaks around July 20 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJul 20UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun10Very high
Jul10Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Iwata 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 Iwata is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1721 µg/m³Dec 159 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr21Moderate
May19Moderate
Jun16Moderate
Jul12Good
Aug11Good
Sep10Good
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is Iwata?

Iwata sits at 34.7°N, 137.8°E, 5 m above sea level, in Japan. The nearest listed city is Fukuroi, 8.0 km away.

Topography around Iwata

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

Within 3 km, the terrain around Iwata has only modest variations in elevation — a maximum elevation change of 36 m around an average of 6 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 262 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,576 m.

The land around Iwata is covered by artificial surfaces (53%) and cropland (37%) within 3 km, water (35%) and artificial surfaces (31%) within 16 km, and trees (45%) and water (44%) within 80 km.

3 km
36 m
16 km
262 m
80 km
2,576 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Fukuroi 8.0 km · Hamamatsu 11 km · Hamakita 13 km · Mori 17 km · Kakegawa 17 km · Kikugawa 25 km · Arai 26 km · Maruobara 27 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 Iwata (34.7°, 137.85°, elevation 5 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).