Tsukubamirai weather in August

In August, Tsukubamirai sees average daytime highs of 31°C and overnight lows near 24°C, with 123 mm of rain across 13.6 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 21% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 48 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Tsukubamirai's 8th-clearest and 8th-windiest month. For the whole year in context, see Tsukubamirai's year-round climate.

Daytime high
31°
1st warmest
Overnight low
24°
12th coldest
Rainfall
123 mm
13.6 wet days
Daylight
13 h 24 min
5:03 AM – 6:25 PM
Cloud cover
67%
8th clearest
Wind
10 km/h
8th windiest
Solar energy
4.7 kWh/m²
Travel score
4.2
out of 10

Tsukubamirai is city in Ibaraki Prefecture, Japan.

Density
630/km²
people per km²
Founded
2006

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 31°C through the month.

A typical August day in Tsukubamirai reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 35°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13124
23124
33124
43124
53124
63124
73124
83124
93124
103124
113124
123124
133124
143124
153124
163124
173124
183124
193124
203124
213124
223124
233024
243024
253023
263023
273023
283023
293023
303023
313023

How August really feels in Tsukubamirai

Once humidity and wind are folded in, August averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Tsukubamirai weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 606.51.29.82.0
Feb10° / 587.21.710.62.3
Mar13° / 10611.60.911.73.7
Apr18° / 10°10611.30.112.95.6
May23° / 15°13112.4013.96.3
Jun26° / 19°15414.9014.45.5
Jul29° / 23°16315.4014.24.5
Aug31° / 24°12313.6013.44.2
Sep27° / 20°16713.9012.25.5
Oct21° / 14°18612.5011.16.2
Nov16° / 859.1010.15.3
Dec11° / 566.80.19.63.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 16% of August, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23664
33664
43664
53763
63763
73862
83763
93763
103763
113763
123763
133763
143763
153763
163664
173664
183664
193664
203664
213763
223763
233763
243664
253763
263862
273862
283862
293961
303961
313961

Chance of precipitation in August

Any precipitation

Tsukubamirai gets around 123 mm of rain over 13.6 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 44% and peaks near 46% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
141
241
341
441
541
642
742
842
942
1043
1143
1243
1344
1444
1544
1644
1744
1844
1945
2045
2145
2245
2345
2445
2545
2645
2745
2845
2945
3046
3146

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 93% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
105125528
205125429
305125429
405125330
505125330
605125330
705135230
805135230
905135230
1005135230
1105135230
1215145030
1315145129
1415155029
1515155128
1615155128
1715165127
1815165226
1926165026
2026175025
2126185123
2226195122
2326205121
2427215020
2527225019
2617235118
2717255017
2818265016
2918274915
3018284814
3119294813

Wind in August

Winds average 10 km/h in August.

Across August, daily wind ranges from about 10 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
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 48 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over August. Sunrise moves from 4:51 AM to 5:15 AM, and sunset from 6:41 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:516:41
213.84:516:40
313.84:526:40
413.84:536:39
513.74:546:38
613.74:556:37
713.74:556:36
813.64:566:35
913.64:576:33
1013.64:586:32
1113.54:596:31
1213.55:006:30
1313.55:006:29
1413.45:016:28
1513.45:026:27
1613.45:036:25
1713.35:046:24
1813.35:046:23
1913.35:056:22
2013.25:066:20
2113.25:076:19
2213.25:086:18
2313.15:086:16
2413.15:096:15
2513.15:106:14
2613.05:116:12
2713.05:126:11
2812.95:126:09
2912.95:136:08
3012.95:146:07
3112.85:156:05

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.7 kWh/m².

For context, solar energy here swings from a low near 2.36 kWh/m² to a high of 5.12 kWh/m² in May across the year — August's 4.7 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.7Bright
164.7Bright
174.7Bright
184.6Bright
194.6Bright
204.6Bright
214.5Bright
224.5Bright
234.5Bright
244.4Bright
254.4Bright
264.4Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
314.2Bright
Planning a trip in August

Hazard calendar for Tsukubamirai

In seasonPeak

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

Tsukubamirai 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 Tsukubamirai?

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

4.2
Sightseeing
8th-best month of the year
6.0
Beach & pool
1st-best month of the year

August is a reasonable time to visit Tsukubamirai for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Tsukubamirai in August

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

In August, Tsukubamirai sees daytime highs around 31°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 14 days see rain.

light clothesrain gearsun protection

Sea temperature near Tsukubamirai in August

The nearest coast averages about 26°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 42 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Tsukubamirai in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tsukubamirai peaks around July 21 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 highModerateJul 21UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Tsukubamirai 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 Tsukubamirai 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 Tsukubamirai?

Tsukubamirai sits at 36.0°N, 140.0°E, 10 m above sea level, in Japan. The nearest listed city is Mitsukaidō, 4.0 km away.

Topography around Tsukubamirai

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

Within 3 km, the terrain around Tsukubamirai has only modest variations in elevation — a maximum elevation change of 29 m around an average of 12 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 51 m; within 80 km, large variations in elevation — a maximum elevation change of 1,177 m.

The land around Tsukubamirai is covered by cropland (55%) and artificial surfaces (27%) within 3 km, artificial surfaces (35%), cropland (32%) and trees (23%) within 16 km, and trees (31%), artificial surfaces (28%) and cropland (21%) within 80 km.

3 km
29 m
16 km
51 m
80 km
1,177 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Mitsukaidō 4.0 km · Moriya 6.0 km · Jōsō 7.0 km · Ushiku 11 km · Toride 11 km · Fujishiro 12 km · Iwai 12 km · Abiko 13 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 Tsukubamirai (35.9841°, 140.0093°, elevation 10 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).