Ryōtsu-minato weather in January

In January, Ryōtsu-minato sees average daytime highs of 6°C and overnight lows near 3°C, with 132 mm of precipitation across 21.4 wet days and about 9.7 hours of daylight. It is the 12th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 6°C through the month. The sky is clear or mostly clear about 6% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 24 min at the start of January to 10 hours by month's end. Set against the rest of the year, January is Ryōtsu-minato's 12th-clearest and 1st-windiest month. For the whole year in context, see Ryōtsu-minato's year-round climate.

Daytime high
12th warmest
Overnight low
2nd coldest
Precipitation
132 mm
21.4 wet days
Daylight
9 h 36 min
7:07 AM – 4:44 PM
Cloud cover
73%
12th clearest
Wind
21 km/h
1st windiest
Solar energy
2.06 kWh/m²
Travel score
0.2
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 6°C through the month.

A typical January day in Ryōtsu-minato reaches about 6°C in the afternoon and slips back to 3°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 2°C and 9°C. Set against its neighbours, January runs about 3°C cooler than December and on par with February.

-5°10°15°151015202531
Avg high (°C)Avg low (°C)
173
263
363
463
563
663
763
863
963
1063
1163
1263
1363
1453
1552
1652
1752
1852
1952
2052
2152
2252
2352
2452
2552
2652
2752
2852
2952
3052
3152

How January really feels in Ryōtsu-minato

Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 31 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
31
wind chill below the day's low

The story in January is cold — wind chill drags the overnight "feels like" below the raw low.

Ryōtsu-minato weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 13221.49.89.70.2
Feb / 9117.68.210.50.3
Mar / 10116.23.311.71.4
Apr13° / 8912.20.2133.5
May18° / 13°92110145.8
Jun22° / 18°12410.5014.66.4
Jul26° / 22°20514.3014.45.8
Aug28° / 24°14612.1013.55.6
Sep25° / 21°14212.5012.36.2
Oct19° / 15°13613.20115.7
Nov14° / 10°13717.30.19.93.3
Dec / 15421.64.89.41.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 22% of January, with mostly cloudy or overcast conditions the remaining 72%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
33070
43070
53070
63070
72971
82971
92971
102971
112872
122872
132872
142872
152773
162773
172773
182773
192674
202674
212674
222773
232773
242773
252773
262872
272872
282872
292971
302971
312971

Chance of precipitation in January

Any precipitationSnow

Ryōtsu-minato gets around 132 mm of rain and snow over 21.4 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 69% and peaks near 70% on the wettest days, and about 10 days bring snow.

0%20%40%60%80%151015202531
Rain chance (%)Snow chance (%)
17024
27025
37025
47026
57027
67028
77028
87029
97030
107030
116930
126931
136831
146831
156732
166732
176732
186733
196633
206633
216733
226733
236733
246834
256834
266935
276935
286935
297036
307036
317036

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 21 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 20 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
121breezy
221breezy
321breezy
421breezy
521breezy
621breezy
721breezy
821breezy
921breezy
1021breezy
1120breezy
1220breezy
1320breezy
1420breezy
1520breezy
1620breezy
1720breezy
1820breezy
1920breezy
2020breezy
2120breezy
2220breezy
2320breezy
2420breezy
2520breezy
2620breezy
2720breezy
2820breezy
2920breezy
3020breezy
3120breezy

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 24 min at the start of January to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over January. Sunrise moves from 7:07 AM to 6:59 AM, and sunset from 4:31 PM to 5:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.47:074:31
29.47:084:32
39.47:084:33
49.47:084:34
59.47:084:34
69.57:084:35
79.57:084:36
89.57:084:37
99.57:084:38
109.57:084:39
119.57:084:40
129.57:084:41
139.67:074:41
149.67:074:42
159.67:074:43
169.67:074:44
179.67:064:45
189.77:064:46
199.77:064:47
209.77:054:48
219.77:054:49
229.87:044:51
239.87:044:52
249.87:034:53
259.87:034:54
269.97:024:55
279.97:024:56
289.97:014:57
2910.07:004:58
3010.07:004:59
3110.06:595:00

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.06 kWh/m².

For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 5.85 kWh/m² in May across the year — January's 2.06 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
11.9Dim
21.9Dim
31.9Dim
41.9Dim
51.9Dim
61.9Dim
71.9Dim
81.9Dim
91.9Dim
101.9Dim
111.9Dim
121.9Dim
132.0Dim
142.0Dim
152.0Dim
162.0Moderate
172.0Moderate
182.1Moderate
192.1Moderate
202.1Moderate
212.1Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.2Moderate
262.3Moderate
272.3Moderate
282.3Moderate
292.4Moderate
302.4Moderate
312.4Moderate
Planning a trip in January

Hazard calendar for Ryōtsu-minato

In seasonPeak

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

Ryōtsu-minato 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 Ryōtsu-minato?

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

0.2
Sightseeing
12th-best month of the year
0.0
Beach & pool
9th-best month of the year

January is a weaker month for outdoor sightseeing in Ryōtsu-minato.

What to pack for Ryōtsu-minato in January

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

In January, Ryōtsu-minato sees daytime highs around 6°C and nights near 3°C. Pack a warm layer and rain gear. Worth having: a heavy coat and a windbreaker. About 21 days see rain.

a warm layerrain geara heavy coata windbreaker

Sea temperature near Ryōtsu-minato in January

The nearest coast averages about 12°C in January — 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 March near 10°C.

It's comfortable for a long swim from Jun 24 to Oct 29 — about 4.2 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb10Bracing
Mar10Bracing
Apr11Bracing
May14Bracing
Jun19Cool
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov18Cool
Dec15Cool

UV index in Ryōtsu-minato 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 Ryōtsu-minato peaks around August 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 14UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug10Very high
Sep8Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Ryōtsu-minato 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 Ryōtsu-minato is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1220 µg/m³Oct 129 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar20Moderate
Apr20Moderate
May18Moderate
Jun14Moderate
Jul12Moderate
Aug10Good
Sep9Good
Oct9Good
Nov10Good
Dec9Good
Location & terrain

Where is Ryōtsu-minato?

Ryōtsu-minato sits at 38.1°N, 138.4°E, 4 m above sea level, in Japan. The nearest listed city is Sado, 9.0 km away.

Topography around Ryōtsu-minato

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

Within 3 km, the terrain around Ryōtsu-minato has only modest variations in elevation — a maximum elevation change of 102 m around an average of 11 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,155 m; within 80 km, large variations in elevation — a maximum elevation change of 1,125 m.

The land around Ryōtsu-minato is covered by water (50%) and trees (23%) within 3 km, trees (55%) and water (34%) within 16 km, and water (78%) within 80 km.

3 km
102 m
16 km
1,155 m
80 km
1,125 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Sado 9.0 km · Maki 53 km · Niigata 55 km · Yoshida-kasugachō 59 km · Shirone 62 km · Tsubame 63 km · Kameda-honchō 63 km · Niitsu-honchō 67 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 Ryōtsu-minato (38.0782°, 138.4394°, elevation 4 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).