Asahi weather in October

In October, Asahi sees average daytime highs of 21°C and overnight lows near 18°C, with 226 mm of rain across 13.9 wet days and about 11.1 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 19°C by the end. The sky is clear or mostly clear about 32% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 36 min by month's end. Set against the rest of the year, October is Asahi's 7th-clearest and 5th-windiest month. For the whole year in context, see Asahi's year-round climate.

Daytime high
21°
5th warmest
Overnight low
18°
8th coldest
Rainfall
226 mm
13.9 wet days
Daylight
11 h 06 min
5:50 AM – 4:55 PM
Cloud cover
61%
7th clearest
Wind
18 km/h
5th windiest
Solar energy
3.13 kWh/m²
Travel score
5.9
out of 10

Asahi is city in Chiba Prefecture, Japan.

Density
496/km²
people per km²
Founded
2005

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 19°C by the end.

A typical October day in Asahi reaches about 21°C in the afternoon and slips back to 18°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 24°C. Set against its neighbours, October runs about 4°C cooler than September and about 4°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12320
22320
32320
42320
52220
62219
72219
82219
92219
102219
112219
122219
132118
142118
152118
162118
172118
182118
192117
202017
212017
222017
232017
242017
252016
262016
271916
281916
291916
301916
311915

Asahi weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan10° / 949.39.92.2
Feb10° / 879.610.62.2
Mar12° / 14213.711.73.1
Apr16° / 12°11912.612.94.8
May20° / 16°13411.913.95.9
Jun23° / 20°16512.914.45.9
Jul26° / 23°1331214.26.2
Aug28° / 24°889.913.46.3
Sep25° / 22°17013.112.26.1
Oct21° / 18°22613.911.15.9
Nov17° / 13°12211.810.15.1
Dec12° / 91109.63.4

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 13% of October, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23961
33961
43961
54159
64258
74258
84258
94357
104357
114357
124456
134456
144555
154555
164654
174555
184654
194654
204654
214852
224852
234852
244852
254951
265050
275050
285149
295149
305248
315248

Chance of precipitation in October

Any precipitation

Asahi gets around 226 mm of rain over 13.9 wet days in October, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 44% and peaks near 46% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
146
246
346
446
546
646
746
846
946
1046
1146
1246
1346
1445
1545
1645
1745
1845
1945
2044
2144
2244
2344
2443
2543
2642
2742
2842
2941
3041
3140

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 32% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1121830318
2131830317
3141930307
4151930296
5162030295
6172130285
7182230264
8192330254
9202429233
10212529223
11222728203
12242828182
13252927162
14273026152
15283126132
16303225121
17313324101
1833332491
1935342381
2037342271
2139342161
2241332150
2343332040
2445331930
2546321930
2648311830
2750311720
2852301620
2953291620
3055291510
3157281410

Wind in October

Winds average 18 km/h in October.

Across October, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze
3117light breeze

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over October. Sunrise moves from 5:37 AM to 6:04 AM, and sunset from 5:16 PM to 4:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:375:16
211.65:385:14
311.65:395:13
411.55:405:11
511.55:405:10
611.55:415:08
711.45:425:07
811.45:435:06
911.35:445:04
1011.35:455:03
1111.35:465:01
1211.25:475:00
1311.25:474:59
1411.25:484:57
1511.15:494:56
1611.15:504:55
1711.05:514:54
1811.05:524:52
1911.05:534:51
2010.95:544:50
2110.95:554:49
2210.95:564:47
2310.85:574:46
2410.85:584:45
2510.85:584:44
2610.75:594:43
2710.76:004:42
2810.76:014:41
2910.66:024:40
3010.66:034:39
3110.66:044:38

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.13 kWh/m².

For context, solar energy here swings from a low near 2.28 kWh/m² to a high of 5.54 kWh/m² in May across the year — October's 3.13 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.4Moderate
43.4Moderate
53.4Moderate
63.4Moderate
73.3Moderate
83.3Moderate
93.3Moderate
103.2Moderate
113.2Moderate
123.2Moderate
133.2Moderate
143.1Moderate
153.1Moderate
163.1Moderate
173.1Moderate
183.1Moderate
193.1Moderate
203.0Moderate
213.0Moderate
223.0Moderate
233.0Moderate
243.0Moderate
253.0Moderate
263.0Moderate
273.0Moderate
282.9Moderate
292.9Moderate
302.9Moderate
312.9Moderate
Planning a trip in October

Hazard calendar for Asahi

In seasonPeak

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

Asahi 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 October a good time to visit Asahi?

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

5.9
Sightseeing
4th-best month of the year
3.6
Beach & pool
5th-best month of the year

October is a reasonable time to visit Asahi for sightseeing.

What to pack for Asahi in October

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

In October, Asahi sees daytime highs around 21°C and nights near 18°C. Worth packing: rain gear. About 14 days see rain.

rain gear

Sea temperature near Asahi in October

The nearest coast averages about 23°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 25°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 5 to Nov 22 — about 5.6 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Cool
Apr16Cool
May19Cool
Jun21Refreshing
Jul23Refreshing
Aug25Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Asahi in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Asahi peaks around August 12 at about 10 (extreme) — 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 highVery highHighModerateAug 12UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Asahi in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Asahi is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1920 µg/m³Dec 178 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar18Moderate
Apr20Moderate
May19Moderate
Jun14Moderate
Jul12Good
Aug11Good
Sep10Good
Oct10Good
Nov9Good
Dec7Good
Location & terrain

Where is Asahi?

Asahi sits at 35.7°N, 140.7°E, 5 m above sea level, in Japan. The nearest listed city is Sōsa, 9.0 km away.

Topography around Asahi

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

Within 3 km, the terrain around Asahi has only modest variations in elevation — a maximum elevation change of 19 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 71 m; within 80 km, large variations in elevation — a maximum elevation change of 840 m.

The land around Asahi is covered by cropland (41%) and artificial surfaces (39%) within 3 km, water (34%), cropland (27%) and trees (22%) within 16 km, and water (44%) and trees (24%) within 80 km.

3 km
19 m
16 km
71 m
80 km
840 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Sōsa 9.0 km · Yōkaichiba 9.0 km · Omigawa 15 km · Hasaki 17 km · Choshi 17 km · Yokoshiba 17 km · Kamisu 20 km · Sawara 23 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 Asahi (35.7167°, 140.65°, 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).