Katsuura weather in October

In October, Katsuura sees average daytime highs of 21°C and overnight lows near 17°C, with 223 mm of rain across 13.6 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 29% of the time in October, and the air most often feels comfortable.

Daylight stretches from about 11 h 42 min at the start of October to 10 h 36 min by month's end. Set against the rest of the year, October is Katsuura's 7th-clearest and 7th-windiest month. For the whole year in context, see Katsuura's year-round climate.

Daytime high
21°
5th warmest
Overnight low
17°
8th coldest
Rainfall
223 mm
13.6 wet days
Daylight
11 h 06 min
5:51 AM – 4:57 PM
Cloud cover
62%
7th clearest
Wind
14 km/h
7th windiest
Solar energy
3.06 kWh/m²
Travel score
6.0
out of 10

Katsuura is city in Chiba Prefecture, Japan.

Density
180/km²
people per km²
Founded
1958

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 Katsuura reaches about 21°C in the afternoon and slips back to 17°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 24°C. Set against its neighbours, October runs about 5°C cooler than September and about 5°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12420
22320
32319
42319
52319
62319
72319
82319
92219
102218
112218
122218
132218
142218
152118
162117
172117
182117
192117
202117
212117
222016
232016
242016
252016
262016
272016
282015
291915
301915
311915

How October really feels in Katsuura

Once humidity and wind are folded in, October 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

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Katsuura 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 daysSnow daysDaylight (hours)Travel score
Jan10° / 918.60.69.92.3
Feb10° / 879.40.810.72.3
Mar13° / 14413.60.311.73.2
Apr17° / 12°11711.9012.95.0
May21° / 16°13111.8013.86.0
Jun24° / 20°17913.9014.35.8
Jul28° / 24°13913014.15.6
Aug29° / 25°11212.6013.35.2
Sep26° / 22°18514.9012.25.7
Oct21° / 17°22313.6011.16.0
Nov17° / 13°12711.4010.25.2
Dec12° / 859.809.73.5

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23664
33763
43763
53862
63862
73961
84060
94060
104060
114159
124159
134258
144258
154456
164456
174555
184555
194555
204753
214753
224753
234951
244951
255050
265149
275248
285347
295248
305347
315347

Chance of precipitation in October

Any precipitation

Katsuura gets around 223 mm of rain over 13.6 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 48% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
148
247
347
447
546
646
746
846
946
1046
1146
1246
1346
1445
1545
1645
1744
1844
1944
2043
2143
2242
2342
2441
2540
2640
2739
2838
2938
3038
3137

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the comfortable band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 17% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1718313591
2819313470
3920323370
4920323260
51021323150
61122323040
71223322840
81325322730
91426322530
101528312330
111630312120
121732301920
131834291720
141936281520
152037271420
162138271210
172340261110
18244025910
19264124810
20284123710
21304122610
22324122500
23344121400
24364120300
25384019300
26403918200
27423817200
28443717200
29473616100
30493615100
31503514100

Wind in October

Winds average 14 km/h in October.

Across October, daily wind ranges from about 13 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
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 42 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 66 minutes over October. Sunrise moves from 5:38 AM to 6:05 AM, and sunset from 5:17 PM to 4:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.75:385:17
211.65:395:16
311.65:405:14
411.55:415:13
511.55:415:12
611.55:425:10
711.45:435:09
811.45:445:07
911.45:455:06
1011.35:465:05
1111.35:465:03
1211.25:475:02
1311.25:485:01
1411.25:494:59
1511.15:504:58
1611.15:514:57
1711.15:524:55
1811.05:534:54
1911.05:544:53
2011.05:544:52
2110.95:554:51
2210.95:564:49
2310.95:574:48
2410.85:584:47
2510.85:594:46
2610.76:004:45
2710.76:014:44
2810.76:024:43
2910.66:034:42
3010.66:044:41
3110.66:054:40

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.06 kWh/m².

For context, solar energy here swings from a low near 2.27 kWh/m² to a high of 5.45 kWh/m² in August across the year — October's 3.06 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.4Moderate
23.4Moderate
33.4Moderate
43.3Moderate
53.3Moderate
63.3Moderate
73.2Moderate
83.2Moderate
93.2Moderate
103.2Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.1Moderate
153.1Moderate
163.1Moderate
173.0Moderate
183.0Moderate
193.0Moderate
203.0Moderate
213.0Moderate
223.0Moderate
233.0Moderate
242.9Moderate
252.9Moderate
262.9Moderate
272.9Moderate
282.9Moderate
292.9Moderate
302.8Moderate
312.8Moderate
Planning a trip in October

Hazard calendar for Katsuura

In seasonPeak

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

Katsuura 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 Katsuura?

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

6.0
Sightseeing
1st-best month of the year
3.8
Beach & pool
5th-best month of the year

October is a reasonable time to visit Katsuura for sightseeing.

What to pack for Katsuura in October

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

In October, Katsuura sees daytime highs around 21°C and nights near 17°C. Worth packing: rain gear. About 14 days see rain.

rain gear

Sea temperature near Katsuura in October

The nearest coast averages about 24°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 26°C and coldest in February near 16°C.

It's comfortable for a long swim from May 22 to Dec 9 — about 6.6 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan18Cool
Feb16Cool
Mar16Cool
Apr18Cool
May20Cool
Jun22Refreshing
Jul24Refreshing
Aug26Warm
Sep26Warm
Oct24Refreshing
Nov22Refreshing
Dec20Cool

UV index in Katsuura 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 Katsuura peaks around August 11 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 highExtremeVery highHighModerateAug 11UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun9Very high
Jul10Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Katsuura 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 Katsuura is worst in April — around 22 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (September, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1322 µg/m³Sep 911 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun16Moderate
Jul12Good
Aug11Good
Sep11Good
Oct14Moderate
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Katsuura?

Katsuura sits at 35.1°N, 140.3°E, 23 m above sea level, in Japan. The nearest listed city is Isumi, 12 km away.

Topography around Katsuura

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

Within 3 km, the terrain around Katsuura has only modest variations in elevation — a maximum elevation change of 162 m around an average of 30 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 379 m; within 80 km, significant variations in elevation — a maximum elevation change of 394 m.

The land around Katsuura is covered by water (56%) and trees (35%) within 3 km, water (59%) and trees (34%) within 16 km, and water (59%) and trees (21%) within 80 km.

3 km
162 m
16 km
379 m
80 km
394 m
treesgrasslandcroplandartificial surfaceswater
October weather nearby: Isumi 12 km · Ōhara 13 km · Kamogawa 20 km · Mobara 31 km · Minamibōsō 38 km · Sodegaura 40 km · Ōamishirasato 41 km · Ōami 41 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 Katsuura (35.1462°, 140.3151°, elevation 23 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).