Moriyama weather in August

In August, Moriyama sees average daytime highs of 32°C and overnight lows near 24°C, with 103 mm of rain across 11.1 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 28% 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 Moriyama's 5th-clearest and 11th-windiest month. For the whole year in context, see Moriyama's year-round climate.

Daytime high
32°
1st warmest
Overnight low
24°
12th coldest
Rainfall
103 mm
11.1 wet days
Daylight
13 h 18 min
5:20 AM – 6:40 PM
Cloud cover
61%
5th clearest
Wind
8 km/h
11th windiest
Solar energy
5.24 kWh/m²
Travel score
4.0
out of 10

Moriyama is city in Shiga Prefecture, Japan.

Density
1,534/km²
people per km²
Founded
1970

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 32°C through the month.

A typical August day in Moriyama reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 35°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°40°151015202531
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123224
133224
143224
153224
163224
173224
183224
193224
203223
213223
223123
233123
243123
253123
263123
273123
283123
293123
303122
313022

How August really feels in Moriyama

Once humidity and wind are folded in, August averages 31 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
31
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.

Moriyama weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 618.32.59.91.2
Feb / 6492.510.71.6
Mar12° / 11012.20.611.73.2
Apr18° / 11911012.95.5
May23° / 13°13810.7013.86.5
Jun26° / 18°17712.9014.35.8
Jul30° / 23°18214.8014.14.3
Aug32° / 24°10311.1013.34.0
Sep28° / 20°15311.5012.25.8
Oct22° / 13°1489.6011.16.7
Nov16° / 746.8010.25.3
Dec10° / 587.71.19.72.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% 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 54%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24456
34654
44654
54654
64654
74654
84654
94654
104654
114654
124654
134753
144654
154654
164753
174753
184753
194753
204753
214753
224654
234654
244654
254654
264555
274555
284456
294456
304456
314456

Chance of precipitation in August

Any precipitation

Moriyama gets around 103 mm of rain over 11.1 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 36% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
139
239
339
439
539
638
738
837
937
1036
1136
1236
1335
1435
1535
1634
1734
1834
1933
2033
2133
2234
2334
2434
2535
2635
2736
2837
2937
3038
3138

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 62% 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 (%)
10218755
20218755
30318736
40318736
50318736
60319726
70319717
80320707
90320707
100321697
111321687
121322677
131422667
141423657
151424647
161424646
172525626
182526616
192527606
202628595
212629585
222630584
232731564
242732554
253833533
263834523
273935503
2831036492
2931037482
3031137462
3131238452

Wind in August

Winds average 8 km/h in August.

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

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

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 5:09 AM to 5:32 AM, and sunset from 6:56 PM to 6:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:096:56
213.85:096:55
313.75:106:54
413.75:116:53
513.75:126:52
613.65:126:51
713.65:136:50
813.65:146:49
913.65:156:48
1013.55:166:47
1113.55:166:46
1213.55:176:45
1313.45:186:44
1413.45:196:42
1513.45:196:41
1613.35:206:40
1713.35:216:39
1813.35:226:38
1913.25:236:36
2013.25:236:35
2113.25:246:34
2213.15:256:33
2313.15:266:31
2413.15:266:30
2513.05:276:29
2613.05:286:27
2713.05:296:26
2812.95:306:25
2912.95:306:23
3012.85:316:22
3112.85:326:20

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.24 kWh/m².

For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 5.41 kWh/m² in May across the year — August's 5.24 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.1Bright
215.1Bright
225.1Bright
235.0Bright
245.0Bright
255.0Bright
264.9Bright
274.9Bright
284.8Bright
294.8Bright
304.8Bright
314.7Bright
Planning a trip in August

Hazard calendar for Moriyama

In seasonPeak

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

Moriyama 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 Moriyama?

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

4.0
Sightseeing
8th-best month of the year
6.3
Beach & pool
1st-best month of the year

August is a reasonable time to visit Moriyama for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Moriyama in August

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

In August, Moriyama sees daytime highs around 32°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Moriyama 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 62 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from May 31 to Nov 9 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul26Warm
Aug27Warm
Sep26Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Moriyama 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 Moriyama peaks around July 14 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 highVery highModerateJul 14UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Moriyama 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 Moriyama is worst in April — around 24 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1723 µg/m³Oct 1812 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar22Moderate
Apr24Moderate
May22Moderate
Jun19Moderate
Jul17Moderate
Aug17Moderate
Sep14Moderate
Oct12Good
Nov13Moderate
Dec12Moderate
Location & terrain

Where is Moriyama?

Moriyama sits at 35.1°N, 136.0°E, 92 m above sea level, in Japan. The nearest listed city is Rittō, 5.0 km away.

Topography around Moriyama

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

Within 3 km, the terrain around Moriyama has only modest variations in elevation — a maximum elevation change of 30 m around an average of 94 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 766 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,418 m.

The land around Moriyama is covered by artificial surfaces (54%) and cropland (36%) within 3 km, trees (37%), artificial surfaces (23%) and water (20%) within 16 km, and trees (59%) within 80 km.

3 km
30 m
16 km
766 m
80 km
1,418 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Rittō 5.0 km · Yasu 5.0 km · Kusatsu 6.0 km · Ōmihachiman 12 km · Kitahama 13 km · Konan 13 km · Ōtsu 13 km · Kōka 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 Moriyama (35.0667°, 135.9833°, elevation 92 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).