Nasu weather in August

In August, Nasu sees average daytime highs of 27°C and overnight lows near 20°C, with 190 mm of rain across 18.4 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 26°C by the end. The sky is clear or mostly clear about 16% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 54 min at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Nasu's 9th-clearest and 11th-windiest month. For the whole year in context, see Nasu's year-round climate.

Daytime high
27°
1st warmest
Overnight low
20°
12th coldest
Rainfall
190 mm
18.4 wet days
Daylight
13 h 24 min
5:01 AM – 6:27 PM
Cloud cover
71%
9th clearest
Wind
5 km/h
11th windiest
Solar energy
4.37 kWh/m²
Travel score
5.0
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 28°C in the first days to 26°C by the end.

A typical August day in Nasu reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 31°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)
12821
22821
32821
42821
52821
62821
72821
82821
92821
102821
112821
122821
132821
142821
152821
162821
172820
182720
192720
202720
212720
222720
232720
242720
252720
262720
272620
282620
292619
302619
312619

How August really feels in Nasu

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.

Nasu weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°619.389.70.0
Feb / -2°568.86.210.60.2
Mar / 11113.35.111.71.8
Apr15° / 13013.11.112.94.1
May20° / 10°14913.90145.6
Jun23° / 15°17616.8014.55.3
Jul26° / 19°24021.1014.34.8
Aug27° / 20°19018.4013.45.0
Sep24° / 17°22716.4012.35.5
Oct18° / 10°185140115.2
Nov13° / 889.40.3103.5
Dec / -0°609.64.19.51.1

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 14% of August, with mostly cloudy or overcast conditions the remaining 70%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13169
23268
33169
43169
53169
63169
73169
83070
93070
102971
112971
122872
132872
142872
152872
162971
172971
182971
193070
202971
213070
223070
233070
243070
253070
263070
273169
283169
293169
303169
313169

Chance of precipitation in August

Any precipitation

Nasu gets around 190 mm of rain over 18.4 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 59% and peaks near 61% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
158
257
357
457
557
657
758
858
958
1059
1159
1259
1360
1460
1560
1660
1760
1861
1961
2061
2161
2261
2361
2461
2560
2660
2760
2860
2960
3060
3160

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 42% of days. Sticky, muggy-or-worse air turns up on roughly 81% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
10393949
20293950
30293851
40293851
50293752
60293752
702103751
802103751
902103751
1002103751
1102113750
1203113749
1313113748
1413123847
1513123846
1613123945
1714133944
1814133943
1914144041
2014154040
2115164039
2215174037
2315184135
2415194134
2516204132
2616224230
2706234229
2806244227
2907254226
3007274224
3117284223

Wind in August

Winds average 5 km/h in August.

Across August, daily wind ranges from about 5 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
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 54 min 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 60 minutes over August. Sunrise moves from 4:48 AM to 5:14 AM, and sunset from 6:43 PM to 6:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.94:486:43
213.94:496:42
313.94:506:41
413.84:516:40
513.84:516:39
613.84:526:38
713.74:536:37
813.74:546:36
913.74:556:35
1013.64:566:34
1113.64:576:33
1213.64:576:32
1313.54:586:30
1413.54:596:29
1513.55:006:28
1613.45:016:27
1713.45:026:25
1813.45:036:24
1913.35:036:23
2013.35:046:21
2113.35:056:20
2213.25:066:19
2313.25:076:17
2413.15:086:16
2513.15:086:15
2613.15:096:13
2713.05:106:12
2813.05:116:10
2912.95:126:09
3012.95:136:07
3112.95:146:06

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.37 kWh/m².

For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 5.19 kWh/m² in May across the year — August's 4.37 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.7Bright
74.6Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.1Bright
274.0Bright
284.0Bright
294.0Moderate
304.0Moderate
313.9Moderate
Planning a trip in August

Hazard calendar for Nasu

In seasonPeak

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

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

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

Is August a good time to visit Nasu?

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

5.0
Sightseeing
5th-best month of the year
5.3
Beach & pool
1st-best month of the year

August is a reasonable time to visit Nasu for sightseeing.

What to pack for Nasu in August

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

In August, Nasu sees daytime highs around 27°C and nights near 20°C. Pack light clothes and rain gear. About 18 days see rain.

light clothesrain gear

UV index in Nasu 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 Nasu peaks around July 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 20UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Low

Air quality in Nasu 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 Nasu is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun16Moderate
Jul14Moderate
Aug13Moderate
Sep11Good
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is Nasu?

Nasu sits at 37.0°N, 140.1°E, 362 m above sea level, in Japan. The nearest listed city is Nasushiobara, 8.0 km away.

Topography around Nasu

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

Within 3 km, the terrain around Nasu has only modest variations in elevation — a maximum elevation change of 143 m around an average of 386 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,727 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,550 m.

The land around Nasu is covered by trees (64%) and cropland (24%) within 3 km, trees (72%) within 16 km, and trees (77%) within 80 km.

3 km
143 m
16 km
1,727 m
80 km
2,550 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Nasushiobara 8.0 km · Kuroiso 9.0 km · Kumakura 14 km · Shirakawa 17 km · Ōtawara 20 km · Yabuki 26 km · Yaita 30 km · Ogawa 33 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 Nasu (37.0421°, 140.0938°, elevation 362 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. 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).