Kasumigaura weather in April

In April, Kasumigaura sees average daytime highs of 18°C and overnight lows near 9°C, with 114 mm of precipitation across 11.9 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 16°C in the first days to 20°C by the end. The sky is clear or mostly clear about 29% 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 Kasumigaura's 7th-clearest and 1st-windiest month. For the whole year in context, see Kasumigaura's year-round climate.

Daytime high
18°
7th warmest
Overnight low
6th coldest
Precipitation
114 mm
11.9 wet days
Daylight
12 h 54 min
5:12 AM – 6:07 PM
Cloud cover
62%
7th clearest
Wind
11 km/h
1st windiest
Solar energy
4.95 kWh/m²
Travel score
5.3
out of 10

Kasumigaura is city in Ibaraki Prefecture, Japan.

Density
256/km²
people per km²
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 16°C in the first days to 20°C by the end.

A typical April day in Kasumigaura reaches about 18°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 13°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)
1156
2157
3167
4167
5167
6167
7167
8168
9178
10178
11178
12178
13179
14189
15189
16189
17189
181810
191810
201910
211910
221910
231911
241911
251911
262011
272011
282011
292012
302012

How April really feels in Kasumigaura

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.

Kasumigaura 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 / 616.71.59.81.8
Feb / 617.41.710.62.1
Mar13° / 11012.5111.73.4
Apr18° / 11411.90.112.95.3
May22° / 14°14012.5013.96.2
Jun25° / 18°15314.9014.45.6
Jul29° / 22°17116.1014.24.7
Aug30° / 23°12713.6013.44.5
Sep26° / 20°17414.5012.25.6
Oct21° / 14°19112.4011.16.1
Nov16° / 919.5010.15.1
Dec11° / 607.40.29.62.9

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 16% of April, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
24951
34951
44951
54951
64951
74753
84753
94654
104654
114555
124456
134357
144357
154357
164258
174258
184258
194258
204258
214258
224258
234258
244258
254357
264456
274456
284456
294456
304456

Chance of precipitation in April

Any precipitation

Kasumigaura gets around 114 mm of rain and snow over 11.9 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 40% and peaks near 40% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
240
340
440
540
640
740
839
939
1039
1139
1239
1340
1440
1540
1640
1740
1840
1940
2040
2140
2240
2340
2440
2540
2640
2740
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 91% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
199100
299100
399100
498200
598200
698200
798200
897300
997300
1097300
1196400
1295410
1395410
1494510
1594510
1693610
1793610
1892710
1990820
2090820
2189920
22881020
23871120
24861220
25841330
26821530
27801640
28781741
29771841
30751951

Wind in April

Winds average 11 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
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
2710calm
2810calm
2910calm
3010calm

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 5:33 AM to 4:54 AM, and sunset from 5:54 PM to 6:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:335:54
212.45:325:55
312.45:305:56
412.55:295:57
512.55:275:57
612.55:265:58
712.65:255:59
812.65:236:00
912.75:226:01
1012.75:206:02
1112.75:196:02
1212.85:176:03
1312.85:166:04
1412.85:146:05
1512.95:136:06
1612.95:126:07
1713.05:106:08
1813.05:096:09
1913.05:086:09
2013.15:066:10
2113.15:056:11
2213.15:046:12
2313.25:026:13
2413.25:016:14
2513.25:006:15
2613.34:596:15
2713.34:576:16
2813.44:566:17
2913.44:556:18
3013.44:546:19

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.95 kWh/m².

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 5.24 kWh/m² in May across the year — April's 4.95 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.1Bright
255.1Bright
265.1Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
Planning a trip in April

Hazard calendar for Kasumigaura

In seasonPeak

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

Kasumigaura 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 Kasumigaura?

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

5.3
Sightseeing
5th-best month of the year
1.7
Beach & pool
7th-best month of the year

April is a reasonable time to visit Kasumigaura for sightseeing.

What to pack for Kasumigaura in April

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

In April, Kasumigaura sees daytime highs around 18°C and nights near 9°C. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

Sea temperature near Kasumigaura 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 at the nearest coast (about 34 km away) is warmest in August at about 24°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 23 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
Jun20Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Kasumigaura 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 Kasumigaura peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 highModerateAug 12UV 10Dec 23UV 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 Kasumigaura 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 Kasumigaura 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 Kasumigaura?

Kasumigaura sits at 36.2°N, 140.2°E, 9 m above sea level, in Japan. The nearest listed city is Ishioka, 4.0 km away.

Topography around Kasumigaura

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

Within 3 km, the terrain around Kasumigaura has only modest variations in elevation — a maximum elevation change of 45 m around an average of 23 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 863 m; within 80 km, large variations in elevation — a maximum elevation change of 945 m.

The land around Kasumigaura is covered by trees (54%) and cropland (21%) within 3 km, trees (44%) and cropland (23%) within 16 km, and trees (31%), water (23%) and artificial surfaces (22%) within 80 km.

3 km
45 m
16 km
863 m
80 km
945 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Ishioka 4.0 km · Suginami 6.0 km · Tsuchiura 8.0 km · Naka 14 km · Ami 14 km · Tsukuba 14 km · Sakuragawa 16 km · Omitama 16 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 Kasumigaura (36.1533°, 140.2464°, elevation 9 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).