Sunagawa weather in August

In August, Sunagawa sees average daytime highs of 24°C and overnight lows near 17°C, with 170 mm of rain across 14.4 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 16% 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 Sunagawa's 8th-clearest and 11th-windiest month. For the whole year in context, see Sunagawa's year-round climate.

Daytime high
24°
1st warmest
Overnight low
17°
12th coldest
Rainfall
170 mm
14.4 wet days
Daylight
13 h 48 min
4:42 AM – 6:31 PM
Cloud cover
72%
8th clearest
Wind
7 km/h
11th windiest
Solar energy
4.18 kWh/m²
Travel score
6.0
out of 10

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 Sunagawa reaches about 24°C in the afternoon and slips back to 17°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 27°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12518
22518
32518
42518
52518
62518
72518
82418
92418
102418
112418
122418
132418
142417
152417
162417
172417
182417
192417
202417
212417
222417
232417
242416
252316
262316
272316
282316
292316
302316
312315

How August really feels in Sunagawa

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.

Sunagawa 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-4° / -11°6115.820.59.10.0
Feb-3° / -10°5213.417.310.20.0
Mar / -6°6814.314.911.60.0
Apr10° / 7313.45.413.21.9
May16° / 8912.40.314.54.6
Jun20° / 12°7911.1015.25.9
Jul23° / 16°13213.5014.96.1
Aug24° / 17°17014.4013.86.0
Sep20° / 12°14014.5012.35.5
Oct14° / 11115.40.910.83.5
Nov / -1°10518.2129.50.6
Dec-1° / -8°8317.720.88.80.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% 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 69%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32872
42971
52971
62971
72971
83070
93070
103070
112971
122971
132971
142971
152872
162971
172971
183070
193070
203070
213169
223169
233367
243466
253565
263565
273664
283664
293664
303763
313763

Chance of precipitation in August

Any precipitation

Sunagawa gets around 170 mm of rain over 14.4 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 47% and peaks near 48% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
145
245
345
446
546
646
747
847
947
1047
1147
1248
1348
1448
1548
1648
1748
1848
1948
2047
2147
2247
2347
2447
2547
2647
2747
2847
2947
3047
3148

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 35% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1416343510
2416343511
3416343511
4416343511
5416343511
6417343411
7417353411
8417353410
9418363310
1041836339
1141837339
1241837328
1341938328
1441938317
1551939317
1652039306
1762039296
1862139295
1972239285
2072339274
2182339264
2292439253
2392539243
24102638233
25112638232
26122737222
27132836222
28142935212
29152934202
30163033201
31173032191

Wind in August

Winds average 7 km/h in August.

Across August, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

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
314.44:286:49
414.34:296:48
514.34:306:46
614.24:316:45
714.24:326:44
814.24:336:42
914.14:346:41
1014.14:366:40
1114.04:376:38
1214.04:386:37
1313.94:396:35
1413.94:406:34
1513.84:416:32
1613.84:426:31
1713.84:436:29
1813.74:456:27
1913.74:466:26
2013.64:476:24
2113.64:486:23
2213.54:496:21
2313.54:506:19
2413.44:516:18
2513.44:536:16
2613.34:546:14
2713.34:556:12
2813.24:566:11
2913.24:576:09
3013.14:586:07
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 4.18 kWh/m².

For context, solar energy here swings from a low near 1.54 kWh/m² to a high of 5.3 kWh/m² in May across the year — August's 4.18 kWh/m² falls in the middle.

012345151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.1Bright
204.1Bright
214.1Bright
224.0Bright
234.0Bright
244.0Bright
254.0Bright
264.0Bright
274.0Bright
284.0Moderate
294.0Moderate
304.0Moderate
313.9Moderate
Planning a trip in August

Hazard calendar for Sunagawa

In seasonPeak

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

Sunagawa 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 Sunagawa?

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

6.0
Sightseeing
2nd-best month of the year
5.1
Beach & pool
1st-best month of the year

August is a reasonable time to visit Sunagawa for sightseeing.

What to pack for Sunagawa in August

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

In August, Sunagawa sees daytime highs around 24°C and nights near 17°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Sunagawa 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 45 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 Sunagawa 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 Sunagawa peaks around August 17 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighVery highHighModerateLowAug 17UV 8Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5High
May7Very high
Jun7High
Jul6High
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Sunagawa 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 Sunagawa 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 Sunagawa?

Sunagawa sits at 43.5°N, 141.9°E, 33 m above sea level, in Japan. The nearest listed city is Takikawa, 7.0 km away.

Topography around Sunagawa

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

Within 3 km, the terrain around Sunagawa has only modest variations in elevation — a maximum elevation change of 198 m around an average of 37 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,086 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,253 m.

The land around Sunagawa is covered by cropland (43%) and trees (29%) within 3 km, trees (64%) and cropland (26%) within 16 km, and trees (62%) within 80 km.

3 km
198 m
16 km
1,086 m
80 km
2,253 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Takikawa 7.0 km · Bibai 18 km · Ashibetsu 23 km · Fukagawa 27 km · Iwamizawa 34 km · Furano 41 km · Shimo-furano 41 km · Tōbetsu 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 Sunagawa (43.4864°, 141.9056°, elevation 33 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).