Yokosuka weather in January

In January, Yokosuka sees average daytime highs of 10°C and overnight lows near 6°C, with 82 mm of precipitation across 7.4 wet days and about 9.9 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 10°C through the month. The sky is clear or mostly clear about 50% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 42 min at the start of January to 10 h 12 min by month's end. Set against the rest of the year, January is Yokosuka's 1st-clearest and 3rd-windiest month. For the whole year in context, see Yokosuka's year-round climate.

Daytime high
10°
12th warmest
Overnight low
2nd coldest
Precipitation
82 mm
7.4 wet days
Daylight
9 h 54 min
6:55 AM – 4:47 PM
Cloud cover
44%
1st clearest
Wind
20 km/h
3rd windiest
Solar energy
2.69 kWh/m²
Travel score
2.5
out of 10

Yokosuka is city in Kanagawa Prefecture, Japan.

Density
4,061/km²
people per km²
Founded
1907

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 10°C through the month.

A typical January day in Yokosuka reaches about 10°C in the afternoon and slips back to 6°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 13°C. Set against its neighbours, January runs about 3°C cooler than December and on par with February.

10°15°151015202531
Avg high (°C)Avg low (°C)
1117
2117
3117
4117
5117
6106
7106
8106
9106
10106
11106
12106
13106
14106
15106
16106
17106
18106
19106
20106
21106
22106
23105
24105
25105
26105
27105
28105
29105
30105
31105

Yokosuka weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 827.40.49.92.5
Feb10° / 838.50.710.72.4
Mar13° / 144130.211.73.3
Apr16° / 13°12611.6012.94.8
May19° / 17°13810.9013.86.0
Jun22° / 20°18212.9014.35.8
Jul25° / 23°14711.5014.16.4
Aug27° / 25°1079.8013.36.5
Sep25° / 22°18513.2012.26.2
Oct21° / 18°22212.7011.16.1
Nov17° / 13°11510.7010.15.3
Dec13° / 738.509.73.7

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% of the time in January, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of January, with mostly cloudy or overcast conditions the remaining 34%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17426
27426
37426
47426
57426
67327
77228
87228
97129
106931
116931
126832
136634
146535
156436
166337
176238
186238
196040
206040
216040
226040
236040
246139
256139
266139
276238
286238
296337
306337
316238

Chance of precipitation in January

Any precipitationSnow

Yokosuka gets around 82 mm of rain and snow over 7.4 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 24% and peaks near 28% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1200
2200
3200
4200
5200
6201
7201
8201
9211
10211
11221
12231
13241
14241
15251
16262
17262
18272
19272
20272
21282
22282
23282
24282
25272
26272
27262
28262
29252
30252
31252

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in January

Winds average 20 km/h in January.

Across January, daily wind ranges from about 19 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
320light breeze
420light breeze
520light breeze
620light breeze
720light breeze
820light breeze
920light breeze
1020light breeze
1120light breeze
1220light breeze
1320light breeze
1420light breeze
1520light breeze
1620light breeze
1720light breeze
1820breezy
1920breezy
2020breezy
2120breezy
2220breezy
2320breezy
2420breezy
2520breezy
2620light breeze
2720light breeze
2820light breeze
2920light breeze
3020light breeze
3120light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 42 min at the start of January to 10 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over January. Sunrise moves from 6:55 AM to 6:48 AM, and sunset from 4:34 PM to 5:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.76:554:34
29.76:554:35
39.76:554:36
49.76:554:36
59.76:554:37
69.76:554:38
79.76:554:39
89.76:564:40
99.76:564:40
109.86:554:41
119.86:554:42
129.86:554:43
139.86:554:44
149.86:554:45
159.86:554:46
169.96:554:47
179.96:544:47
189.96:544:48
199.96:544:49
209.96:544:50
2110.06:534:51
2210.06:534:52
2310.06:524:53
2410.06:524:54
2510.16:524:55
2610.16:514:56
2710.16:514:57
2810.16:504:58
2910.26:494:59
3010.26:495:00
3110.26:485:01

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.69 kWh/m².

For context, solar energy here swings from a low near 2.28 kWh/m² to a high of 5.25 kWh/m² in May across the year — January's 2.69 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.5Moderate
22.6Moderate
32.6Moderate
42.6Moderate
52.6Moderate
62.6Moderate
72.6Moderate
82.6Moderate
92.6Moderate
102.6Moderate
112.6Moderate
122.6Moderate
132.6Moderate
142.6Moderate
152.6Moderate
162.6Moderate
172.6Moderate
182.6Moderate
192.6Moderate
202.6Moderate
212.7Moderate
222.7Moderate
232.7Moderate
242.8Moderate
252.8Moderate
262.8Moderate
272.9Moderate
282.9Moderate
292.9Moderate
302.9Moderate
313.0Moderate
Planning a trip in January

Hazard calendar for Yokosuka

In seasonPeak

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

Yokosuka 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 January a good time to visit Yokosuka?

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

2.5
Sightseeing
11th-best month of the year
0.0
Beach & pool
11th-best month of the year

January is a weaker month for outdoor sightseeing in Yokosuka.

What to pack for Yokosuka in January

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

In January, Yokosuka sees daytime highs around 10°C and nights near 6°C. Pack a warm layer. About 7 days see rain.

a warm layer

Sea temperature near Yokosuka in January

The nearest coast averages about 16°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 18 km away) is warmest in August at about 26°C and coldest in February near 15°C.

It's comfortable for a long swim from May 31 to Nov 26 — about 5.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar16Cool
Apr17Cool
May19Cool
Jun21Refreshing
Jul24Refreshing
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Yokosuka in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yokosuka peaks around July 22 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 highHighModerateJul 22UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Yokosuka in January

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Yokosuka is worst in April — around 26 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1525 µg/m³Dec 1612 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb25Moderate
Mar23Moderate
Apr26Moderate
May21Moderate
Jun18Moderate
Jul13Moderate
Aug12Moderate
Sep12Moderate
Oct14Moderate
Nov14Moderate
Dec12Good
Location & terrain

Where is Yokosuka?

Yokosuka sits at 35.3°N, 139.7°E, 9 m above sea level, in Japan. The nearest listed city is Kurihama, 7.0 km away.

Topography around Yokosuka

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

Within 3 km, the terrain around Yokosuka has only modest variations in elevation — a maximum elevation change of 133 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 237 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,738 m.

The land around Yokosuka is covered by water (41%), artificial surfaces (35%) and trees (23%) within 3 km, water (62%) within 16 km, and water (43%), trees (30%) and artificial surfaces (20%) within 80 km.

3 km
133 m
16 km
237 m
80 km
1,738 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Kurihama 7.0 km · Zushi 8.0 km · Hayama 8.0 km · Sugita 11 km · Kamakura 11 km · Futtsu 14 km · Isogo 15 km · Miura 17 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 Yokosuka (35.2836°, 139.6672°, elevation 9 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).