Niigata weather in August

In August, Niigata sees average daytime highs of 28°C and overnight lows near 24°C, with 160 mm of rain across 12.9 wet days and about 13.5 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 34% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 14 hours at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Niigata's 1st-clearest and 10th-windiest month. For the whole year in context, see Niigata's year-round climate.

Daytime high
28°
1st warmest
Overnight low
24°
12th coldest
Rainfall
160 mm
12.9 wet days
Daylight
13 h 30 min
5:04 AM – 6:32 PM
Cloud cover
58%
1st clearest
Wind
11 km/h
10th windiest
Solar energy
5.19 kWh/m²
Travel score
5.7
out of 10
Air quality
Good
PM2.5 10 µg/m³ · 2010

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 28°C through the month.

A typical August day in Niigata reaches about 28°C in the afternoon and slips back to 24°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 31°C. Set against its neighbours, August runs about 2°C warmer than July and about 3°C warmer than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12824
22825
32825
42825
52825
62825
72825
82825
92825
102825
112825
122825
132825
142825
152825
162825
172824
182824
192824
202824
212824
222824
232824
242824
252824
262824
272824
282724
292724
302724
312723

How August really feels in Niigata

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.

Niigata weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 17726.510.39.70.3
Feb / 11421.28.810.50.4
Mar / 11018.62.511.71.4
Apr13° / 9012.60.2133.5
May18° / 13°9911.80145.6
Jun22° / 18°12311.2014.66.3
Jul26° / 23°22615.2014.45.8
Aug28° / 24°16012.9013.55.7
Sep25° / 21°14614.2012.35.9
Oct20° / 16°15515.80115.4
Nov14° / 10°16419.70.2103.2
Dec / 19525.44.19.41.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of August, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24852
34852
44852
55050
65050
75050
85050
95050
105149
115050
125149
135050
145149
154951
165050
175050
185050
195050
205050
215050
225050
234951
245050
254951
264951
274951
284852
294852
304852
314852

Chance of precipitation in August

Any precipitation

Niigata gets around 160 mm of rain over 12.9 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 42% and peaks near 49% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
135
235
334
434
534
635
735
836
936
1037
1138
1239
1340
1441
1542
1643
1743
1844
1945
2045
2146
2246
2347
2447
2547
2648
2748
2848
2949
3049
3149

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 44% of days. Sticky, muggy-or-worse air turns up on roughly 94% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
102134837
202134738
302134639
402134540
502144440
602144440
702144440
802154439
902154439
1003154438
1103154437
1203164536
1303164536
1404164535
1504174534
1605174632
1705184531
1806184530
1916194529
2017204428
2117214427
2218224426
2318244324
2419254323
2519264222
26110284220
27110294119
28111314117
29111324016
30112334014
31113343913

Wind in August

Winds average 11 km/h in August.

Across August, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 hours 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 66 minutes over August. Sunrise moves from 4:50 AM to 5:17 AM, and sunset from 6:49 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.04:506:49
214.04:516:48
313.94:526:47
413.94:536:46
513.94:546:45
613.84:556:44
713.84:566:43
813.84:576:42
913.74:576:41
1013.74:586:40
1113.74:596:39
1213.65:006:37
1313.65:016:36
1413.65:026:35
1513.55:036:34
1613.55:046:32
1713.45:046:31
1813.45:056:30
1913.45:066:28
2013.35:076:27
2113.35:086:26
2213.35:096:24
2313.25:106:23
2413.25:116:21
2513.15:126:20
2613.15:126:18
2713.15:136:17
2813.05:146:15
2913.05:156:14
3012.95:166:12
3112.95:176:11

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.19 kWh/m².

For context, solar energy here swings from a low near 1.62 kWh/m² to a high of 5.68 kWh/m² in May across the year — August's 5.19 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.4Bright
95.4Bright
105.4Bright
115.3Bright
125.3Bright
135.3Bright
145.2Bright
155.2Bright
165.2Bright
175.1Bright
185.1Bright
195.1Bright
205.0Bright
215.0Bright
225.0Bright
234.9Bright
244.9Bright
254.9Bright
264.8Bright
274.8Bright
284.8Bright
294.7Bright
304.7Bright
314.7Bright
Planning a trip in August

Hazard calendar for Niigata

In seasonPeak

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

Niigata 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 Niigata?

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

5.7
Sightseeing
4th-best month of the year
6.4
Beach & pool
1st-best month of the year

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

What to pack for Niigata in August

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

In August, Niigata sees daytime highs around 28°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

Sea temperature near Niigata 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 at the nearest coast (about 16 km away) is warmest in August at about 26°C and coldest in March near 10°C.

It's comfortable for a long swim from Jun 22 to Oct 30 — about 4.3 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb10Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun19Cool
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov18Cool
Dec15Cool

UV index in Niigata 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 Niigata peaks around August 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 13UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug9Very high
Sep8Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Niigata 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 Niigata is worst in April — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 7 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Niigata's WHO annual average of 10 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1216 µg/m³Oct 127 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar15Moderate
Apr16Moderate
May14Moderate
Jun11Good
Jul9Good
Aug8Good
Sep7Good
Oct7Good
Nov7Good
Dec7Good
Location & terrain

Where is Niigata?

Niigata sits at 37.9°N, 139.0°E, 1 m above sea level, in Japan. The nearest listed city is Kameda-honchō, 8.0 km away.

Topography around Niigata

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

Within 3 km, the terrain around Niigata has only modest variations in elevation — a maximum elevation change of 29 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 42 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,110 m.

The land around Niigata is covered by artificial surfaces (55%) and water (39%) within 3 km, water (52%) and cropland (24%) within 16 km, and water (45%) and trees (44%) within 80 km.

3 km
29 m
16 km
42 m
80 km
2,110 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Kameda-honchō 8.0 km · Niitsu-honchō 15 km · Shirone 18 km · Agano 19 km · Suibara 19 km · Maki 24 km · Gosen 24 km · Shibata 26 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 Niigata (37.9226°, 139.0412°, elevation 1 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).