Chiba weather in August

In August, Chiba sees average daytime highs of 28°C and overnight lows near 24°C, with 118 mm of rain across 11.5 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 9th-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 30% 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 Chiba's 7th-clearest and 10th-windiest month. For the whole year in context, see Chiba's year-round climate.

Daytime high
28°
1st warmest
Overnight low
24°
12th coldest
Rainfall
118 mm
11.5 wet days
Daylight
13 h 24 min
5:03 AM – 6:24 PM
Cloud cover
60%
7th clearest
Wind
14 km/h
10th windiest
Solar energy
5.05 kWh/m²
Travel score
5.6
out of 10

Chiba is city in Chiba prefecture, Japan.

Air quality
Moderate
PM2.5 11 µg/m³ · 2010
Density
3,605/km²
people per km²
Founded
1921

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 Chiba 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 26°C and 31°C. Set against its neighbours, August runs about 1°C warmer than July and about 3°C warmer than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12824
22824
32924
42924
52924
62924
72924
82924
92924
102924
112924
122924
132924
142924
152924
162924
172824
182824
192824
202824
212824
222824
232824
242824
252824
262824
272824
282824
292824
302824
312824

How August really feels in Chiba

Once humidity and wind are folded in, August averages 16 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
16
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.

Chiba weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 877.90.79.91.8
Feb / 828.71.110.71.9
Mar12° / 149130.511.73.0
Apr16° / 11°13812.9012.94.8
May20° / 16°14912.1013.95.9
Jun23° / 19°18914.3014.45.8
Jul27° / 23°15512.9014.25.8
Aug28° / 24°11811.5013.35.6
Sep25° / 22°20714.8012.25.8
Oct21° / 16°25114.4011.15.8
Nov16° / 11°12611.8010.14.8
Dec11° / 808.80.19.63.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24456
34456
44555
54654
64753
74753
84654
94753
104753
114654
124753
134753
144753
154753
164753
174852
184852
194852
204852
214852
224852
234852
244852
254852
264852
274852
284852
294852
304852
314753

Chance of precipitation in August

Any precipitation

Chiba gets around 118 mm of rain over 11.5 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 38% and peaks near 44% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
132
232
332
432
532
632
733
833
934
1034
1135
1236
1336
1437
1537
1638
1738
1839
1939
2040
2140
2241
2341
2442
2542
2642
2743
2843
2943
3044
3144

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 51% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
103105532
20395434
30395434
40395335
50395236
60395137
70395137
80395137
90395137
100395137
1103105037
1203105037
1303105037
1403115036
1503115036
1603115135
1703115135
1813125034
1914125033
2014135032
2114135032
2214145031
2314155030
2414165029
2514165227
2614175226
2714185225
2814195323
2914205322
3015215221
3115225220

Wind in August

Winds average 14 km/h in August.

Across August, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

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 4:51 AM to 5:15 AM, and sunset from 6:40 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:516:40
213.84:526:39
313.84:536:38
413.74:536:37
513.74:546:36
613.74:556:35
713.64:566:34
813.64:576:33
913.64:576:32
1013.64:586:31
1113.54:596:30
1213.55:006:29
1313.55:016:28
1413.45:016:27
1513.45:026:26
1613.45:036:24
1713.35:046:23
1813.35:056:22
1913.35:056:21
2013.25:066:19
2113.25:076:18
2213.25:086:17
2313.15:086:15
2413.15:096:14
2513.05:106:13
2613.05:116:11
2713.05:126:10
2812.95:126:09
2912.95:136:07
3012.95:146:06
3112.85:156:04

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.05 kWh/m².

For context, solar energy here swings from a low near 2.28 kWh/m² to a high of 5.2 kWh/m² in May across the year — August's 5.05 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.1Bright
145.1Bright
155.1Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
204.9Bright
214.9Bright
224.8Bright
234.8Bright
244.8Bright
254.7Bright
264.7Bright
274.7Bright
284.6Bright
294.6Bright
304.5Bright
314.5Bright
Planning a trip in August

Hazard calendar for Chiba

In seasonPeak

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

Chiba 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 Chiba?

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

5.6
Sightseeing
6th-best month of the year
6.6
Beach & pool
1st-best month of the year

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

What to pack for Chiba in August

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

In August, Chiba sees daytime highs around 28°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

Sea temperature near Chiba 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 22 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Chiba 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 Chiba peaks around August 10 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 highModerateAug 10UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Chiba 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 Chiba is worst in April — around 16 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (September, 8 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Chiba's WHO annual average of 11 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1316 µg/m³Sep 98 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar15Moderate
Apr16Moderate
May15Moderate
Jun11Good
Jul8Good
Aug8Good
Sep8Good
Oct10Good
Nov10Good
Dec9Good
Location & terrain

Where is Chiba?

Chiba sits at 35.6°N, 140.1°E, 5 m above sea level, in Japan. The nearest listed city is Yotsukaidō, 7.0 km away.

Topography around Chiba

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

Within 3 km, the terrain around Chiba has only modest variations in elevation — a maximum elevation change of 38 m around an average of 9 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 129 m; within 80 km, large variations in elevation — a maximum elevation change of 890 m.

The land around Chiba is covered by artificial surfaces (73%) within 3 km, artificial surfaces (37%), trees (27%) and water (24%) within 16 km, and water (36%), artificial surfaces (24%) and trees (23%) within 80 km.

3 km
38 m
16 km
129 m
80 km
890 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Yotsukaidō 7.0 km · Makuhari 8.0 km · Ichihara 10 km · Narashino 11 km · Yachiyo 15 km · Honchō 16 km · Sakura 17 km · Shisui 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 Chiba (35.6°, 140.1167°, elevation 5 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).