Sendai weather in August

In August, Sendai sees average daytime highs of 27°C and overnight lows near 21°C, with 169 mm of rain across 16.2 wet days and about 13.5 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 17% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 14 hours at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Sendai's 10th-clearest and 11th-windiest month. For the whole year in context, see Sendai's year-round climate.

Daytime high
27°
1st warmest
Overnight low
21°
12th coldest
Rainfall
169 mm
16.2 wet days
Daylight
13 h 30 min
4:56 AM – 6:26 PM
Cloud cover
73%
10th clearest
Wind
6 km/h
11th windiest
Solar energy
4.24 kWh/m²
Travel score
5.4
out of 10

Sendai is city in Miyagi Prefecture, Japan.

Air quality
Good
PM2.5 7 µg/m³ · 2010
Density
1,395/km²
people per km²
Founded
1889

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 27°C through the month.

A typical August day in Sendai reaches about 27°C in the afternoon and slips back to 21°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 31°C. Set against its neighbours, August runs about 2°C warmer than July and about 4°C warmer than September.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12721
22821
32821
42821
52821
62821
72821
82821
92821
102821
112721
122721
132721
142721
152721
162721
172721
182721
192721
202721
212721
222721
232721
242721
252621
262620
272620
282620
292620
302620
312620

How August really feels in Sendai

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.

Sendai weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°6310.99.99.60.0
Feb / -3°499.27.710.50.0
Mar / -0°8711.65.411.71.4
Apr14° / 9411.21.1134.0
May19° / 11°10311.40145.8
Jun22° / 16°12913.4014.65.8
Jul26° / 20°18717.4014.45.3
Aug27° / 21°16916.2013.55.4
Sep24° / 17°16714.3012.35.8
Oct18° / 11°141110115.6
Nov12° / 639.30.99.93.3
Dec / -0°581169.40.6

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 12% of August, with mostly cloudy or overcast conditions the remaining 71%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
33070
43070
52971
62971
72971
82971
92971
102872
112872
122872
132674
142674
152872
162872
172773
182773
192872
202872
212872
222971
232872
242872
252872
262872
272872
282971
292971
302971
312971

Chance of precipitation in August

Any precipitation

Sendai gets around 169 mm of rain over 16.2 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 52% and peaks near 53% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
150
250
350
450
551
651
751
851
951
1052
1152
1252
1352
1452
1552
1652
1752
1852
1952
2052
2152
2252
2353
2453
2553
2653
2753
2853
2953
3053
3153

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 47% of days. Sticky, muggy-or-worse air turns up on roughly 82% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
131127554
231126555
331126555
431125565
531125565
631125565
731125565
831125565
931126555
1031226545
1131227544
1231228534
1331229524
1431230514
1541231503
1641232493
1741233483
1841233473
1951234463
2051335453
2151335442
2251436432
2361436412
2461536402
2561637392
2661737382
2761837362
2861937352
2972038332
3072138312
3172338302

Wind in August

Winds average 6 km/h in August.

Across August, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 hours at the start of August to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over August. Sunrise moves from 4:42 AM to 5:09 AM, and sunset from 6:43 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.04:426:43
214.04:436:42
313.94:446:41
413.94:456:40
513.94:466:39
613.84:476:38
713.84:486:37
813.84:496:35
913.74:496:34
1013.74:506:33
1113.74:516:32
1213.64:526:31
1313.64:536:29
1413.64:546:28
1513.54:556:27
1613.54:566:26
1713.54:576:24
1813.44:586:23
1913.44:586:21
2013.34:596:20
2113.35:006:19
2213.35:016:17
2313.25:026:16
2413.25:036:14
2513.25:046:13
2613.15:056:11
2713.15:066:10
2813.05:076:08
2913.05:076:07
3013.05:086:05
3112.95:096:04

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.24 kWh/m².

For context, solar energy here swings from a low near 2.06 kWh/m² to a high of 5.34 kWh/m² in May across the year — August's 4.24 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.1Bright
224.0Bright
234.0Bright
244.0Bright
254.0Moderate
264.0Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.9Moderate
313.8Moderate
Planning a trip in August

Hazard calendar for Sendai

In seasonPeak

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

Sendai sits in the Pacific typhoon belt; the season peaks July–October.

Sendai's rainy season runs March–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Sendai?

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

5.4
Sightseeing
5th-best month of the year
5.5
Beach & pool
1st-best month of the year

August is a reasonable time to visit Sendai for sightseeing.

What to pack for Sendai in August

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

In August, Sendai sees daytime highs around 27°C and nights near 21°C. Pack light clothes and rain gear. About 16 days see rain.

light clothesrain gear

Sea temperature near Sendai in August

The nearest coast averages about 24°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 28 km away) is warmest in August at about 24°C and coldest in March near 9°C.

It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan11Bracing
Feb9Bracing
Mar9Bracing
Apr10Bracing
May14Bracing
Jun18Cool
Jul21Refreshing
Aug24Refreshing
Sep23Refreshing
Oct19Cool
Nov17Cool
Dec14Bracing

UV index in Sendai in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sendai peaks around August 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 16UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low
Location & terrain

Where is Sendai?

Sendai sits at 38.3°N, 140.9°E, 53 m above sea level, in Japan. The nearest listed city is Natori-shi, 11 km away.

Topography around Sendai

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

Within 3 km, the terrain around Sendai has only modest variations in elevation — a maximum elevation change of 173 m around an average of 67 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 513 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,978 m.

The land around Sendai is covered by artificial surfaces (74%) and trees (24%) within 3 km, trees (44%) and artificial surfaces (29%) within 16 km, and trees (57%) and water (26%) within 80 km.

3 km
173 m
16 km
513 m
80 km
1,978 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Natori-shi 11 km · Rifu 12 km · Tagajō-shi 12 km · Tomiya 14 km · Shiogama 16 km · Shōbudahama 17 km · Iwanuma 18 km · Yoshioka 19 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 Sendai (38.2667°, 140.8667°, elevation 53 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).