Bibai weather in April

In April, Bibai sees average daytime highs of 11°C and overnight lows near 2°C, with 67 mm of precipitation across 11.8 wet days and about 13.2 hours of daylight. It is the 7th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 7°C in the first days to 14°C by the end. The sky is clear or mostly clear about 31% 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 Bibai's 2nd-clearest and 1st-windiest month. For the whole year in context, see Bibai's year-round climate.

Daytime high
11°
7th warmest
Overnight low
6th coldest
Precipitation
67 mm
11.8 wet days
Daylight
13 h 12 min
4:57 AM – 6:08 PM
Cloud cover
59%
2nd clearest
Wind
12 km/h
1st windiest
Solar energy
5.05 kWh/m²
Travel score
2.5
out of 10

Bibai is city in Hokkaidō, Japan.

Density
105/km²
people per km²
Founded
1950

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 7°C in the first days to 14°C by the end.

A typical April day in Bibai reaches about 11°C in the afternoon and slips back to 2°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 16°C. Set against its neighbours, April runs about 8°C warmer than March and about 6°C cooler than May.

-10°10°20°151015202530
Avg high (°C)Avg low (°C)
17-2
27-1
37-1
48-1
58-1
680
790
890
990
1090
11101
12101
13101
14101
15112
16112
17112
18112
19123
20123
21123
22123
23133
24134
25134
26134
27134
28145
29145
30145

How April really feels in Bibai

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 21 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
21
wind chill below the day's low

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

Bibai weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -10°4912.718.19.20.0
Feb-2° / -9°4210.714.910.20.0
Mar / -5°5711.610.511.60.1
Apr11° / 6711.83.313.22.5
May16° / 8411.40.114.54.9
Jun20° / 12°649.6015.16.1
Jul23° / 17°11311.6014.96.4
Aug24° / 18°16112.5013.86.3
Sep21° / 13°12613.2012.35.9
Oct15° / 9213.60.310.84.1
Nov / 8716.18.49.50.9
Dec / -7°6915.318.18.80.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 54%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
35050
44951
54852
64852
74852
84852
94852
104852
114753
124753
134852
144852
154753
164654
174654
184654
194654
204555
214654
224654
234555
244555
254456
264456
274456
284258
294258
304258

Chance of precipitation in April

Any precipitationSnow

Bibai gets around 67 mm of rain and snow over 11.8 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 39% and peaks near 40% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
13720
23720
33719
43818
53817
63817
73816
83815
93815
103814
113814
123813
133812
143812
153911
163911
173910
18399
19399
20408
21407
22407
23406
24406
25405
26404
27404
28403
29403
30402

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 12 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 12 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light 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 5:24 AM to 4:35 AM, and sunset from 5:51 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:245:51
212.55:225:52
312.55:205:53
412.65:185:54
512.65:175:55
612.75:155:56
712.75:135:58
812.85:115:59
912.85:096:00
1012.95:086:01
1112.95:066:02
1213.05:046:04
1313.05:026:05
1413.15:016:06
1513.14:596:07
1613.24:576:08
1713.24:556:10
1813.34:546:11
1913.34:526:12
2013.44:506:13
2113.44:496:14
2213.54:476:16
2313.54:466:17
2413.64:446:18
2513.64:426:19
2613.74:416:20
2713.74:396:22
2813.74:386:23
2913.84:366:24
3013.84:356:25

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.05 kWh/m².

For context, solar energy here swings from a low near 1.6 kWh/m² to a high of 5.38 kWh/m² in May across the year — April's 5.05 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
Planning a trip in April

Hazard calendar for Bibai

In seasonPeak

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

Bibai 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 Bibai?

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

2.5
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 Bibai.

What to pack for Bibai in April

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

In April, Bibai sees daytime highs around 11°C and nights near 2°C. Pack a warm layer. Worth having: rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

Sea temperature near Bibai 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 40 km away) is warmest in August at about 22°C and coldest in February near 5°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
Feb5Bracing
Mar5Bracing
Apr7Bracing
May10Bracing
Jun14Bracing
Jul19Cool
Aug22Refreshing
Sep21Refreshing
Oct17Cool
Nov13Bracing
Dec9Bracing

UV index in Bibai 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 Bibai peaks around August 18 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighVery highHighModerateLowAug 18UV 8Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr6High
May7Very high
Jun7High
Jul5High
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Bibai 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 Bibai 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 1220 µg/m³Dec 159 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb15Moderate
Mar20Moderate
Apr21Moderate
May19Moderate
Jun14Moderate
Jul13Moderate
Aug11Good
Sep11Good
Oct12Good
Nov10Good
Dec9Good
Location & terrain

Where is Bibai?

Bibai sits at 43.3°N, 141.9°E, 25 m above sea level, in Japan. The nearest listed city is Iwamizawa, 16 km away.

Topography around Bibai

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

Within 3 km, the terrain around Bibai has only modest variations in elevation — a maximum elevation change of 237 m around an average of 40 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 798 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,032 m.

The land around Bibai is covered by cropland (53%) and trees (23%) within 3 km, trees (55%) and cropland (35%) within 16 km, and trees (65%) within 80 km.

3 km
237 m
16 km
798 m
80 km
2,032 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Iwamizawa 16 km · Sunagawa 18 km · Takikawa 26 km · Tōbetsu 30 km · Ashibetsu 33 km · Ebetsu 35 km · Ishikari 42 km · Shimo-furano 43 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 Bibai (43.3247°, 141.8586°, elevation 25 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).