Ōarai weather in April

In April, Ōarai sees average daytime highs of 16°C and overnight lows near 10°C, with 124 mm of precipitation across 12.4 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 14°C in the first days to 18°C by the end. The sky is clear or mostly clear about 30% 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 Ōarai's 7th-clearest and 3rd-windiest month. For the whole year in context, see Ōarai's year-round climate.

Daytime high
16°
7th warmest
Overnight low
10°
5th coldest
Precipitation
124 mm
12.4 wet days
Daylight
12 h 54 min
5:10 AM – 6:06 PM
Cloud cover
61%
7th clearest
Wind
15 km/h
3rd windiest
Solar energy
5.03 kWh/m²
Travel score
4.7
out of 10

Ōarai is town in Higashiibaraki District, Ibaraki Prefecture, Japan.

Density
661/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 14°C in the first days to 18°C by the end.

A typical April day in Ōarai reaches about 16°C in the afternoon and slips back to 10°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 20°C. Set against its neighbours, April runs about 4°C warmer than March and about 4°C cooler than May.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
1148
2148
3148
4148
5148
6149
7159
8159
9159
10159
11159
121510
131610
141610
151610
161610
171610
181611
191611
201711
211711
221711
231711
241712
251712
261812
271812
281812
291812
301813

How April really feels in Ōarai

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.

Ōarai 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 / 737.61.39.81.7
Feb / 718.11.610.61.8
Mar12° / 126130.911.72.9
Apr16° / 10°12412.40.112.94.7
May20° / 15°14812.6013.95.8
Jun23° / 18°15914.1014.45.7
Jul26° / 22°16214.9014.25.7
Aug28° / 23°11112.1013.46.0
Sep25° / 21°17614.1012.26.0
Oct20° / 16°21313.5011.15.8
Nov16° / 11°10610.5010.14.8
Dec11° / 718.60.29.62.9

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 15% of April, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
24951
34753
44753
54753
64654
74654
84555
94555
104456
114456
124456
134357
144357
154357
164258
174357
184357
194357
204456
214456
224456
234456
244555
254555
264555
274555
284555
294555
304555

Chance of precipitation in April

Any precipitation

Ōarai gets around 124 mm of rain and snow over 12.4 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 41% and peaks near 42% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)
142
242
342
442
542
642
742
842
941
1041
1141
1241
1341
1441
1541
1642
1742
1842
1942
2042
2142
2241
2341
2441
2541
2641
2741
2840
2940
3039

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49820
59820
69820
79820
89730
99631
109541
119541
129451
139451
149361
159361
169271
179181
189181
198992
2088102
2187112
2286122
2384142
2483152
2582162
2679183
2778193
2876204
2974224
3072235

Wind in April

Winds average 15 km/h in April.

Across April, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light 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 5:32 AM to 4:52 AM, and sunset from 5:53 PM to 6:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:325:53
212.45:305:54
312.45:295:54
412.55:275:55
512.55:265:56
612.55:255:57
712.65:235:58
812.65:225:59
912.75:206:00
1012.75:196:00
1112.75:176:01
1212.85:166:02
1312.85:146:03
1412.85:136:04
1512.95:126:05
1612.95:106:06
1713.05:096:06
1813.05:076:07
1913.05:066:08
2013.15:056:09
2113.15:036:10
2213.15:026:11
2313.25:016:12
2413.25:006:13
2513.34:586:13
2613.34:576:14
2713.34:566:15
2813.44:556:16
2913.44:536:17
3013.44:526:18

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.03 kWh/m².

For context, solar energy here swings from a low near 2.35 kWh/m² to a high of 5.38 kWh/m² in May across the year — April's 5.03 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in April

Hazard calendar for Ōarai

In seasonPeak

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

Ōarai 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 Ōarai?

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

4.7
Sightseeing
8th-best month of the year
0.7
Beach & pool
7th-best month of the year

April is a reasonable time to visit Ōarai for sightseeing.

What to pack for Ōarai in April

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

In April, Ōarai sees daytime highs around 16°C and nights near 10°C. Worth packing: a warm layer, rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

Sea temperature near Ōarai 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 24°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 24 to Oct 28 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun19Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Ōarai 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 Ōarai peaks around July 24 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 24UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Ōarai 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 Ōarai is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2425 µg/m³Dec 1914 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar25Moderate
Apr25Moderate
May24Moderate
Jun19Moderate
Jul16Moderate
Aug15Moderate
Sep15Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Ōarai?

Ōarai sits at 36.3°N, 140.6°E, 22 m above sea level, in Japan. The nearest listed city is Katsuta, 9.0 km away.

Topography around Ōarai

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

Within 3 km, the terrain around Ōarai has only modest variations in elevation — a maximum elevation change of 45 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 64 m; within 80 km, large variations in elevation — a maximum elevation change of 1,005 m.

The land around Ōarai is covered by water (56%) within 3 km, water (50%) within 16 km, and trees (36%), water (29%) and cropland (20%) within 80 km.

3 km
45 m
16 km
64 m
80 km
1,005 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Katsuta 9.0 km · Hitachi-Naka 10 km · Mito 13 km · Inada 15 km · Okunoya 15 km · Funaishikawa 17 km · Tokai 18 km · Hokota 19 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 Ōarai (36.3141°, 140.5839°, elevation 22 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).