Bibai weather in August

In August, Bibai sees average daytime highs of 24°C and overnight lows near 18°C, with 161 mm of rain across 12.5 wet days and about 13.8 hours of daylight. It is the 1st-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 17% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 24 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Bibai's 11th-clearest and 12th-windiest month. For the whole year in context, see Bibai's year-round climate.

Daytime high
24°
1st warmest
Overnight low
18°
12th coldest
Rainfall
161 mm
12.5 wet days
Daylight
13 h 48 min
4:43 AM – 6:30 PM
Cloud cover
71%
11th clearest
Wind
9 km/h
12th windiest
Solar energy
4.28 kWh/m²
Travel score
6.3
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 August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical August day in Bibai reaches about 24°C in the afternoon and slips back to 18°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 28°C. Set against its neighbours, August runs about 1°C warmer than July and about 3°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12518
22518
32518
42518
52518
62518
72518
82518
92518
102518
112518
122518
132518
142518
152518
162518
172418
182418
192418
202418
212418
222417
232417
242417
252417
262417
272417
282417
292417
302417
312416

How August really feels in Bibai

Once humidity and wind are folded in, August 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

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Bibai weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 1st-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 August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 15% of August, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
33070
43070
53169
63169
73268
83268
93268
103169
113169
123169
133169
143070
153070
163070
173169
183169
193169
203169
213169
223367
233367
243466
253367
263565
273664
283664
293664
303664
313763

Chance of precipitation in August

Any precipitation

Bibai gets around 161 mm of rain over 12.5 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
139
239
340
440
540
641
741
841
941
1041
1141
1241
1341
1441
1541
1641
1741
1841
1941
2041
2140
2240
2340
2440
2540
2641
2741
2841
2941
3042
3142

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the humid band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 41% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1315313714
2215313714
3215313715
4215313715
5215313715
6215313715
7214323615
8314333615
9314343514
10314353514
11314363413
12314373413
13313383412
14313383312
15413393211
16414403211
17514403110
18515403110
1951540309
2061641298
2171641288
2271741287
2381841277
2481941266
2592040256
2692140256
27102239245
28112338245
29112437235
30122536224
31132636214

Wind in August

Winds average 9 km/h in August, the calmest month.

Across August, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 24 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over August. Sunrise moves from 4:26 AM to 5:00 AM, and sunset from 6:51 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.44:266:51
214.44:276:50
314.34:286:49
414.34:296:47
514.34:316:46
614.24:326:45
714.24:336:43
814.14:346:42
914.14:356:41
1014.14:366:39
1114.04:376:38
1214.04:386:36
1313.94:396:35
1413.94:416:34
1513.84:426:32
1613.84:436:30
1713.74:446:29
1813.74:456:27
1913.74:466:26
2013.64:476:24
2113.64:496:23
2213.54:506:21
2313.54:516:19
2413.44:526:18
2513.44:536:16
2613.34:546:14
2713.34:556:12
2813.24:566:11
2913.24:586:09
3013.14:596:07
3113.15:006:05

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.28 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 — August's 4.28 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.1Bright
284.1Bright
294.0Bright
304.0Bright
314.0Bright
Planning a trip in August

Hazard calendar for Bibai

In seasonPeak

In August, 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 August a good time to visit Bibai?

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

6.3
Sightseeing
2nd-best month of the year
5.5
Beach & pool
1st-best month of the year

August is a reasonable time to visit Bibai for sightseeing.

What to pack for Bibai in August

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

In August, Bibai sees daytime highs around 24°C and nights near 18°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near Bibai in August

The nearest coast averages about 22°C in August — 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 August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 (very high — sun protection essential). 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 August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August 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
August 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).