Hakone weather in August

In August, Hakone sees average daytime highs of 29°C and overnight lows near 22°C, with 184 mm of rain across 16.5 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 29°C in the first days to 27°C by the end. The sky is clear or mostly clear about 20% 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 Hakone's 8th-clearest and 8th-windiest month. For the whole year in context, see Hakone's year-round climate.

Daytime high
29°
1st warmest
Overnight low
22°
12th coldest
Rainfall
184 mm
16.5 wet days
Daylight
13 h 18 min
5:08 AM – 6:28 PM
Cloud cover
68%
8th clearest
Wind
6 km/h
8th windiest
Solar energy
4.99 kWh/m²
Travel score
4.8
out of 10

Hakone is town in Ashigarashimo district, Kanagawa prefecture, Japan.

Density
122/km²
people per km²
Founded
1956

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 29°C in the first days to 27°C by the end.

A typical August day in Hakone reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 32°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12922
22922
32922
42923
52923
62923
72923
82923
92923
102923
112923
122922
132922
142922
152922
162922
172922
182922
192822
202822
212822
222822
232822
242822
252822
262822
272821
282821
292721
302721
312721

How August really feels in Hakone

Once humidity and wind are folded in, August averages 8 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
8
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.

Hakone 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 / 949.74.69.91.1
Feb / 10610.9510.71.2
Mar11° / 18015.63.411.72.5
Apr16° / 18114.40.512.94.5
May21° / 13°19114.4013.85.6
Jun23° / 17°23518014.35.1
Jul28° / 21°23517.9014.14.9
Aug29° / 22°18416.5013.34.8
Sep25° / 19°26016.7012.25.5
Oct20° / 13°25115.5011.15.4
Nov15° / 13112.4010.14.1
Dec10° / 8810.219.72.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% 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 65%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
23763
33763
43763
53763
63664
73664
83664
93664
103664
113565
123565
133664
143664
153565
163565
173565
183565
193565
203565
213565
223565
233565
243466
253466
263565
273565
283565
293466
303466
313367

Chance of precipitation in August

Any precipitation

Hakone gets around 184 mm of rain over 16.5 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 54% and peaks near 56% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
154
254
354
454
554
654
754
854
954
1053
1153
1253
1353
1453
1553
1653
1754
1854
1954
2053
2153
2253
2353
2453
2554
2654
2754
2855
2955
3056
3156

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 63% 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 (%)
10423685
20322705
30322705
40321715
50320725
60220726
70219736
80319726
90319735
100319735
110319735
121419715
131420714
141420714
151521694
161522684
171623673
181624663
191726633
201727632
211828612
222830582
232931562
242933551
2521034531
2621036511
2721137491
2821238481
2911240461
3011341441
3111442421

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 6 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
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 4:56 AM to 5:20 AM, and sunset from 6:44 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:566:44
213.84:576:43
313.74:586:42
413.74:596:41
513.74:596:40
613.65:006:39
713.65:016:38
813.65:026:37
913.65:026:36
1013.55:036:35
1113.55:046:34
1213.55:056:33
1313.45:066:32
1413.45:066:30
1513.45:076:29
1613.35:086:28
1713.35:096:27
1813.35:096:26
1913.25:106:24
2013.25:116:23
2113.25:126:22
2213.15:136:21
2313.15:136:19
2413.15:146:18
2513.05:156:17
2613.05:166:15
2713.05:166:14
2812.95:176:13
2912.95:186:11
3012.85:196:10
3112.85:206:08

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.99 kWh/m².

For context, solar energy here swings from a low near 2.42 kWh/m² to a high of 5.27 kWh/m² in May across the year — August's 4.99 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
184.9Bright
194.9Bright
204.9Bright
214.8Bright
224.8Bright
234.8Bright
244.7Bright
254.7Bright
264.7Bright
274.6Bright
284.6Bright
294.6Bright
304.5Bright
314.5Bright
Planning a trip in August

Hazard calendar for Hakone

In seasonPeak

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

Hakone 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 Hakone?

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

4.8
Sightseeing
6th-best month of the year
5.7
Beach & pool
1st-best month of the year

August is a reasonable time to visit Hakone for sightseeing.

What to pack for Hakone in August

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

In August, Hakone sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 17 days see rain.

light clothesrain gearsun protection

Sea temperature near Hakone 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 offshore is warmest in August at about 26°C and coldest in February near 15°C.

It's comfortable for a long swim from May 31 to Nov 26 — about 5.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar16Cool
Apr17Cool
May19Cool
Jun21Refreshing
Jul24Refreshing
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Hakone 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 Hakone peaks around July 20 at about 10 (extreme) — 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 highExtremeVery highHighModerateJul 20UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun9Very high
Jul10Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Hakone 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 Hakone is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1623 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb20Moderate
Mar20Moderate
Apr23Moderate
May20Moderate
Jun17Moderate
Jul13Moderate
Aug12Good
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Hakone?

Hakone sits at 35.2°N, 139.0°E, 0 m above sea level, in Japan. The nearest listed city is Yugawara, 6.0 km away.

Topography around Hakone

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

Within 3 km, the terrain around Hakone has large variations in elevation — a maximum elevation change of 627 m around an average of 811 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,429 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,736 m.

The land around Hakone is covered by trees (81%) within 3 km, trees (63%) within 16 km, and trees (44%) and water (40%) within 80 km.

3 km
627 m
16 km
1,429 m
80 km
3,736 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Yugawara 6.0 km · Susono 11 km · Atami 12 km · Kamizawa 12 km · Nakatogari 13 km · Mishima 13 km · Odawara 14 km · Fushimi 14 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 Hakone (35.1895°, 139.0265°, elevation 0 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).