Otaru weather in April

In April, Otaru sees average daytime highs of 7°C and overnight lows near 1°C, with 66 mm of precipitation across 11.2 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 12th-wettest month of the year here.

Highs climb over the month, from about 5°C in the first days to 9°C by the end. The sky is clear or mostly clear about 34% 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 48 min by month's end. Set against the rest of the year, April is Otaru's 1st-clearest and 7th-windiest month. For the whole year in context, see Otaru's year-round climate.

Daytime high
7th warmest
Overnight low
5th coldest
Precipitation
66 mm
11.2 wet days
Daylight
13 h 12 min
5:01 AM – 6:12 PM
Cloud cover
57%
1st clearest
Wind
13 km/h
7th windiest
Solar energy
5.31 kWh/m²
Travel score
0.7
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 5°C in the first days to 9°C by the end.

A typical April day in Otaru reaches about 7°C in the afternoon and slips back to 1°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 3°C and 10°C. Set against its neighbours, April runs about 5°C warmer than March and about 5°C cooler than May.

-5°10°15°151015202530
Avg high (°C)Avg low (°C)
14-1
24-1
350
450
550
650
750
850
960
1061
1161
1261
1361
1461
1561
1671
1772
1872
1972
2072
2172
2282
2383
2483
2583
2683
2793
2893
2994
3094

How April really feels in Otaru

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 27 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
27
wind chill below the day's low

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

Otaru weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -6°9820.824.29.20.0
Feb-2° / -6°791820.210.20.0
Mar / -3°761515.411.60.0
Apr / 6611.2513.10.7
May12° / 8411.70.414.43.0
Jun17° / 12°7610.6015.15.1
Jul21° / 17°12712.8014.95.9
Aug23° / 19°16314.2013.86.0
Sep20° / 16°14913.9012.35.6
Oct14° / 11714.90.610.83.5
Nov / 12918.611.29.50.7
Dec-0° / -3°12621.922.58.90.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in April, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of April, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24951
34951
44951
55050
64951
75050
85050
94951
105149
115050
125149
135149
145149
155149
165149
175149
185050
195149
205149
215149
225050
234951
244951
254951
264852
274654
284654
294654
304555

Chance of precipitation in April

Any precipitationSnow

Otaru gets around 66 mm of rain and snow over 11.2 wet days in April, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 38% and peaks near 42% on the wettest days, and about 5 days bring snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
14232
24131
34129
44028
54026
63925
73823
83822
93721
103720
113719
123718
133718
143717
153717
163716
173715
183715
193714
203714
213713
223712
233712
243711
253710
26379
27379
28378
29377
30376

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100

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
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light 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 24 min at the start of April to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over April. Sunrise moves from 5:27 AM to 4:38 AM, and sunset from 5:54 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:275:54
212.55:265:55
312.55:245:56
412.65:225:57
512.65:205:59
612.75:186:00
712.75:176:01
812.85:156:02
912.85:136:03
1012.95:116:05
1112.95:096:06
1213.05:086:07
1313.05:066:08
1413.15:046:09
1513.15:026:10
1613.25:016:12
1713.24:596:13
1813.34:576:14
1913.34:566:15
2013.44:546:16
2113.44:526:18
2213.54:516:19
2313.54:496:20
2413.64:486:21
2513.64:466:22
2613.74:446:24
2713.74:436:25
2813.74:416:26
2913.84:406:27
3013.84:386:28

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.31 kWh/m².

For context, solar energy here swings from a low near 1.4 kWh/m² to a high of 5.59 kWh/m² in May across the year — April's 5.31 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.1Bright
55.1Bright
65.1Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in April

Hazard calendar for Otaru

In seasonPeak

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

Otaru 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 Otaru?

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

0.7
Sightseeing
7th-best month of the year
0.0
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in Otaru.

What to pack for Otaru in April

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

In April, Otaru sees daytime highs around 7°C and nights near 1°C. Pack a warm layer. Worth having: a heavy coat, rain gear and sun protection. About 11 days see rain.

a warm layera heavy coatrain gearsun protection

Sea temperature near Otaru in April

The nearest coast averages about 7°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 23 km away) is warmest in August at about 22°C and coldest in February near 6°C.

It's comfortable for a long swim from Jul 31 to Sep 22 — about 1.8 months when the water holds above 20°C.

10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan7Bracing
Feb6Bracing
Mar6Bracing
Apr7Bracing
May10Bracing
Jun14Bracing
Jul19Cool
Aug22Refreshing
Sep21Refreshing
Oct17Cool
Nov13Bracing
Dec9Bracing

UV index in Otaru in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Otaru peaks around August 18 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighVery highHighModerateLowAug 18UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5High
May7Very high
Jun7High
Jul5Moderate
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Otaru 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 Otaru 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).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1121 µg/m³Dec 169 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb15Moderate
Mar21Moderate
Apr21Moderate
May19Moderate
Jun13Moderate
Jul12Moderate
Aug11Good
Sep10Good
Oct12Good
Nov11Good
Dec9Good
Location & terrain

Where is Otaru?

Otaru sits at 43.2°N, 141.0°E, 30 m above sea level, in Japan. The nearest listed city is Yoichi, 19 km away.

Topography around Otaru

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

Within 3 km, the terrain around Otaru has significant variations in elevation — a maximum elevation change of 508 m around an average of 83 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,289 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,867 m.

The land around Otaru is covered by trees (44%), artificial surfaces (32%) and water (23%) within 3 km, water (49%) and trees (46%) within 16 km, and trees (48%) and water (37%) within 80 km.

3 km
508 m
16 km
1,289 m
80 km
1,867 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Yoichi 19 km · Ishikari 29 km · Sapporo 31 km · Kutchan 38 km · Tōbetsu 42 km · Ebetsu 45 km · Niseko 50 km · Kitahiroshima 52 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 Otaru (43.1894°, 141.0022°, elevation 30 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).