Komagane weather in August

In August, Komagane sees average daytime highs of 26°C and overnight lows near 18°C, with 121 mm of rain across 14.1 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 25°C by the end. The sky is clear or mostly clear about 18% of the time in August, and the air most often feels humid.

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 Komagane's 8th-clearest and 12th-windiest month. For the whole year in context, see Komagane's year-round climate.

Daytime high
26°
1st warmest
Overnight low
18°
12th coldest
Rainfall
121 mm
14.1 wet days
Daylight
13 h 24 min
5:11 AM – 6:33 PM
Cloud cover
67%
8th clearest
Wind
5 km/h
12th windiest
Solar energy
4.96 kWh/m²
Travel score
5.9
out of 10

Komagane is city in Nagano Prefecture, Japan.

Density
194/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

Highs ease over the month, from about 27°C in the first days to 25°C by the end.

A typical August day in Komagane reaches about 26°C in the afternoon and slips back to 18°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 29°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)
12718
22718
32718
42718
52718
62718
72718
82718
92718
102718
112718
122718
132718
142718
152718
162718
172718
182718
192618
202618
212618
222618
232618
242618
252618
262617
272617
282617
292517
302517
312517

How August really feels in Komagane

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.

Komagane 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 / -8°8310.710.59.90.0
Feb / -7°889.38.310.60.0
Mar / -3°14413.27.811.70.9
Apr13° / 13312.11.912.93.6
May18° / 13711.9013.95.6
Jun22° / 14°18115.2014.45.4
Jul25° / 17°20316.5014.25.6
Aug26° / 18°12114.1013.45.9
Sep23° / 15°16412.5012.26.1
Oct17° / 17611.7011.15.2
Nov11° / 989.71.110.12.7
Dec / -4°8010.47.59.60.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23862
33862
43862
53862
63862
73862
83862
93862
103862
113862
123862
133862
143862
153862
163862
173961
183961
193961
203961
213961
223961
233961
243961
253862
263862
273862
283862
293763
303763
313763

Chance of precipitation in August

Any precipitation

Komagane gets around 121 mm of rain over 14.1 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 45% and peaks near 46% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
144
244
344
444
544
644
744
845
945
1045
1145
1246
1346
1446
1546
1646
1746
1846
1946
2046
2145
2245
2345
2445
2545
2645
2745
2845
2945
3044
3144

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 60% of days. Sticky, muggy-or-worse air turns up on roughly 22% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11106326
21106227
3196327
4196228
5196228
6196129
7196129
8196129
9196129
10196129
111106128
121106128
132115928
142116027
152126026
162135926
173135925
183145924
193156022
203166021
214175920
224185919
234196017
244206016
255225815
265235814
275245813
286255712
297265611
307275511
318275510

Wind in August

Winds average 5 km/h in August, the calmest month.

Across August, daily wind ranges from about 5 km/h on the calmest days to 5 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
275calm
285calm
295calm
305calm
315calm

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 5:00 AM to 5:23 AM, and sunset from 6:49 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:006:49
213.85:006:48
313.85:016:47
413.75:026:46
513.75:036:45
613.75:036:44
713.75:046:43
813.65:056:42
913.65:066:41
1013.65:076:40
1113.55:076:39
1213.55:086:38
1313.55:096:37
1413.45:106:36
1513.45:116:34
1613.45:116:33
1713.35:126:32
1813.35:136:31
1913.35:146:29
2013.25:156:28
2113.25:156:27
2213.25:166:26
2313.15:176:24
2413.15:186:23
2513.05:196:22
2613.05:196:20
2713.05:206:19
2812.95:216:17
2912.95:226:16
3012.95:236:15
3112.85:236:13

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.96 kWh/m².

For context, solar energy here swings from a low near 2.57 kWh/m² to a high of 5.6 kWh/m² in May across the year — August's 4.96 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
95.1Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.9Bright
204.8Bright
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

Is August a good time to visit Komagane?

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

5.9
Sightseeing
2nd-best month of the year
5.8
Beach & pool
1st-best month of the year

August is a reasonable time to visit Komagane for sightseeing.

What to pack for Komagane in August

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

In August, Komagane sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes and sun protection. About 14 days see rain.

rain gearlight clothessun protection

UV index in Komagane 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 Komagane peaks around July 13 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 13UV 11Dec 20UV 2
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul11Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Komagane 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 Komagane is worst in April — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1918 µg/m³Dec 178 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar17Moderate
Apr18Moderate
May17Moderate
Jun16Moderate
Jul13Moderate
Aug12Good
Sep10Good
Oct10Good
Nov9Good
Dec8Good
Location & terrain

Where is Komagane?

Komagane sits at 35.7°N, 137.9°E, 640 m above sea level, in Japan. The nearest listed city is Ina, 12 km away.

Topography around Komagane

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

Within 3 km, the terrain around Komagane has significant variations in elevation — a maximum elevation change of 298 m around an average of 659 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,500 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,183 m.

The land around Komagane is covered by artificial surfaces (33%), cropland (31%) and trees (26%) within 3 km, trees (80%) within 16 km, and trees (90%) within 80 km.

3 km
298 m
16 km
2,500 m
80 km
3,183 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Ina 12 km · Minamiminowa 18 km · Kinoshita 21 km · Iida 24 km · Tatsuno 30 km · Chino 37 km · Okaya 39 km · Suwa 39 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 Komagane (35.7166°, 137.9375°, elevation 640 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).