Katsuyama weather in August

In August, Katsuyama sees average daytime highs of 27°C and overnight lows near 20°C, with 194 mm of rain across 17.2 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 4th-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 23% of the time in August, and the air most often feels muggy.

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 Katsuyama's 4th-clearest and 12th-windiest month. For the whole year in context, see Katsuyama's year-round climate.

Daytime high
27°
1st warmest
Overnight low
20°
12th coldest
Rainfall
194 mm
17.2 wet days
Daylight
13 h 24 min
5:17 AM – 6:39 PM
Cloud cover
65%
4th clearest
Wind
7 km/h
12th windiest
Solar energy
4.99 kWh/m²
Travel score
5.4
out of 10

Katsuyama is city in Fukui Prefecture, Japan.

Density
107/km²
people per km²
Founded
1954

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 Katsuyama 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 24°C and 30°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12721
22721
32721
42721
52721
62721
72721
82721
92721
102721
112721
122721
132720
142720
152720
162720
172720
182720
192720
202720
212720
222720
232720
242620
252619
262619
272619
282619
292619
302619
312619

How August really feels in Katsuyama

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.

Katsuyama weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°18021.820.69.80.0
Feb / -5°14617.415.510.60.0
Mar / -2°18417.110.411.70.7
Apr13° / 17514.22.912.93.3
May18° / 10°19214.40.113.95.3
Jun22° / 15°24315.4014.45.4
Jul26° / 19°32119.5014.25.1
Aug27° / 20°19417.2013.45.4
Sep23° / 16°24815.4012.25.7
Oct18° / 10°18913.30.111.15.2
Nov11° / 16115.33.410.12.5
Dec / -2°18720.615.39.60.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24258
34258
44258
54357
64258
74159
84159
94060
104060
114060
124060
134060
144060
154060
164060
174060
184060
194060
204060
214060
224060
234060
244060
254060
264060
274060
284060
293961
303961
313961

Chance of precipitation in August

Any precipitation

Katsuyama gets around 194 mm of rain over 17.2 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 55% and peaks near 58% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
158
258
357
457
557
657
757
856
956
1056
1156
1256
1356
1456
1556
1656
1756
1855
1955
2055
2155
2254
2354
2454
2553
2653
2753
2853
2953
3053
3153

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 63% of days. Sticky, muggy-or-worse air turns up on roughly 80% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
101116919
201116820
301116721
401116721
501106722
601106722
701106722
801106722
901106623
1001106722
1101106722
1202116522
1302116522
1402116621
1502126620
1602136520
1703146419
1803156418
1903166417
2004176316
2104186315
2205206114
2305216212
2415226111
2516245910
2616255810
271727569
281728568
291829557
301830556
311931536

Wind in August

Winds average 7 km/h in August, the calmest month.

Across August, daily wind ranges from about 7 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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
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 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 5:05 AM to 5:29 AM, and sunset from 6:56 PM to 6:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:056:56
213.85:056:55
313.85:066:54
413.85:076:53
513.75:086:52
613.75:096:51
713.75:096:50
813.65:106:49
913.65:116:48
1013.65:126:47
1113.55:136:45
1213.55:136:44
1313.55:146:43
1413.45:156:42
1513.45:166:41
1613.45:176:39
1713.35:186:38
1813.35:186:37
1913.35:196:36
2013.25:206:34
2113.25:216:33
2213.25:226:32
2313.15:226:30
2413.15:236:29
2513.15:246:28
2613.05:256:26
2713.05:266:25
2813.05:266:24
2912.95:276:22
3012.95:286:21
3112.85:296:19

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 2.14 kWh/m² to a high of 5.51 kWh/m² in May across the year — August's 4.99 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.7Bright
264.7Bright
274.7Bright
284.6Bright
294.6Bright
304.6Bright
314.5Bright
Planning a trip in August

Hazard calendar for Katsuyama

In seasonPeak

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

Katsuyama 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 Katsuyama?

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

5.4
Sightseeing
2nd-best month of the year
5.5
Beach & pool
1st-best month of the year

August is a reasonable time to visit Katsuyama for sightseeing.

What to pack for Katsuyama in August

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

In August, Katsuyama sees daytime highs around 27°C and nights near 20°C. Pack rain gear. Worth having: light clothes and sun protection. About 17 days see rain.

rain gearlight clothessun protection

Sea temperature near Katsuyama in August

The nearest coast averages about 27°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 35 km away) is warmest in August at about 27°C and coldest in March near 11°C.

It's comfortable for a long swim from Jun 16 to Nov 5 — about 4.7 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar11Bracing
Apr13Bracing
May16Cool
Jun20Refreshing
Jul24Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Katsuyama 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 Katsuyama peaks around July 17 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 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 highModerateJul 17UV 10Jan 10UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Very high
Jul10Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Katsuyama 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 Katsuyama is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1620 µg/m³Dec 1310 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr20Moderate
May19Moderate
Jun17Moderate
Jul13Moderate
Aug12Good
Sep11Good
Oct10Good
Nov11Good
Dec10Good
Location & terrain

Where is Katsuyama?

Katsuyama sits at 36.1°N, 136.5°E, 130 m above sea level, in Japan. The nearest listed city is Ono, 9.0 km away.

Topography around Katsuyama

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

Within 3 km, the terrain around Katsuyama has significant variations in elevation — a maximum elevation change of 446 m around an average of 193 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,627 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,671 m.

The land around Katsuyama is covered by trees (48%), cropland (24%) and artificial surfaces (22%) within 3 km, trees (85%) within 16 km, and trees (63%) and water (25%) within 80 km.

3 km
446 m
16 km
1,627 m
80 km
2,671 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Ono 9.0 km · Iijima 13 km · Maruoka 23 km · Fukui-shi 25 km · Sakai 29 km · Kaga 30 km · Sabae 31 km · Awara 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 Katsuyama (36.0617°, 136.501°, elevation 130 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).