Shiroishi weather in April

In April, Shiroishi sees average daytime highs of 14°C and overnight lows near 4°C, with 95 mm of precipitation across 12.5 wet days and about 13 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 11°C in the first days to 17°C by the end. The sky is clear or mostly clear about 26% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 30 min by month's end. Set against the rest of the year, April is Shiroishi's 2nd-clearest and 5th-windiest month. For the whole year in context, see Shiroishi's year-round climate.

Daytime high
14°
7th warmest
Overnight low
6th coldest
Precipitation
95 mm
12.5 wet days
Daylight
13 hours
5:08 AM – 6:07 PM
Cloud cover
62%
2nd clearest
Wind
9 km/h
5th windiest
Solar energy
5.04 kWh/m²
Travel score
3.8
out of 10

Shiroishi is city in Miyagi Prefecture, Japan.

Density
116/km²
people per km²
Founded
1954

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 11°C in the first days to 17°C by the end.

A typical April day in Shiroishi reaches about 14°C in the afternoon and slips back to 4°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 19°C. Set against its neighbours, April runs about 6°C warmer than March and about 5°C cooler than May.

10°20°151015202530
Avg high (°C)Avg low (°C)
1102
2112
3112
4112
5112
6122
7123
8123
9123
10133
11134
12134
13134
14144
15144
16145
17145
18155
19155
20155
21156
22156
23166
24166
25166
26167
27167
28177
29177
30177

How April really feels in Shiroishi

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 7 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
7
wind chill below the day's low

The story in April is cold — wind chill drags the overnight "feels like" below the raw low.

Shiroishi weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°7814.5159.70.0
Feb / -4°5811.911.710.50.0
Mar / -1°9213.48.211.71.0
Apr14° / 9512.51.8133.8
May19° / 10°9812.40145.7
Jun22° / 15°12613.6014.65.8
Jul26° / 19°18818.2014.45.2
Aug27° / 20°16015.8013.55.5
Sep23° / 16°15314012.35.8
Oct18° / 10°13511.50115.4
Nov12° / 7111.629.92.9
Dec / -1°6914.510.19.40.3

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 18% of April, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24753
34753
44654
54654
64654
74753
84654
94654
104654
114654
124654
134456
144456
154456
164357
174456
184357
194456
204258
214357
224258
234357
244357
254258
264258
274258
284159
294258
304159

Chance of precipitation in April

Any precipitationSnow

Shiroishi gets around 95 mm of rain and snow over 12.5 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 42% and peaks near 45% on the wettest days, and about 2 days bring snow.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
14516
24515
34514
44513
54513
64512
74411
84410
94410
10439
11438
12438
13427
14427
15426
16426
17415
18415
19414
20414
21413
22403
23402
24402
25402
26402
27401
28401
29391
30391

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 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
13991
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24982
25982
26982
27973
28973
29973
30964

Wind in April

Winds average 9 km/h in April.

Across April, daily wind ranges from about 8 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
278calm
288calm
298calm
308calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 30 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 5:31 AM to 4:49 AM, and sunset from 5:53 PM to 6:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:315:53
212.45:305:54
312.55:285:55
412.55:265:56
512.55:255:57
612.65:235:58
712.65:225:59
812.75:206:00
912.75:196:01
1012.75:176:02
1112.85:166:03
1212.85:146:03
1312.95:136:04
1412.95:116:05
1512.95:106:06
1613.05:086:07
1713.05:076:08
1813.15:056:09
1913.15:046:10
2013.15:036:11
2113.25:016:12
2213.25:006:13
2313.34:586:14
2413.34:576:15
2513.34:566:16
2613.44:546:17
2713.44:536:18
2813.44:526:19
2913.54:516:19
3013.54:496:20

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.04 kWh/m².

For context, solar energy here swings from a low near 2.03 kWh/m² to a high of 5.33 kWh/m² in May across the year — April's 5.04 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in April

Hazard calendar for Shiroishi

In seasonPeak

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

Shiroishi 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 Shiroishi?

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

3.8
Sightseeing
7th-best month of the year
0.3
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in Shiroishi.

What to pack for Shiroishi in April

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

In April, Shiroishi sees daytime highs around 14°C and nights near 4°C. Worth packing: a warm layer, rain gear and sun protection. About 13 days see rain.

a warm layerrain gearsun protection

Sea temperature near Shiroishi in April

The nearest coast averages about 10°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 46 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
Jan11Bracing
Feb9Bracing
Mar9Bracing
Apr10Bracing
May14Bracing
Jun18Cool
Jul21Refreshing
Aug24Refreshing
Sep23Refreshing
Oct19Cool
Nov17Cool
Dec14Bracing

UV index in Shiroishi in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April 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 Shiroishi peaks around August 13 at about 9 (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 9Jan 10UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Shiroishi 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 Shiroishi is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1622 µg/m³Dec 1710 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun16Moderate
Jul14Moderate
Aug12Moderate
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Shiroishi?

Shiroishi sits at 38.0°N, 140.6°E, 57 m above sea level, in Japan. The nearest listed city is Ōkawara, 11 km away.

Topography around Shiroishi

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

Within 3 km, the terrain around Shiroishi has significant variations in elevation — a maximum elevation change of 493 m around an average of 100 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,805 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,031 m.

The land around Shiroishi is covered by trees (50%), cropland (23%) and artificial surfaces (23%) within 3 km, trees (80%) within 16 km, and trees (63%) and water (20%) within 80 km.

3 km
493 m
16 km
1,805 m
80 km
2,031 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Ōkawara 11 km · Kakuda 14 km · Murata 16 km · Yanagawamachi-saiwaichō 17 km · Watari 21 km · Hobaramachi 22 km · Date 23 km · Iwanuma 24 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 Shiroishi (38.0033°, 140.6183°, elevation 57 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).