Muroran weather in January

In January, Muroran sees average daytime highs of -1°C and overnight lows near -4°C, with 50 mm of precipitation across 8.5 wet days and about 9.3 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near -1°C through the month. The sky is clear or mostly clear about 18% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 hours at the start of January to 9 h 42 min by month's end. Set against the rest of the year, January is Muroran's 9th-clearest and 2nd-windiest month. For the whole year in context, see Muroran's year-round climate.

Daytime high
-1°
12th warmest
Overnight low
-4°
1st coldest
Precipitation
50 mm
8.5 wet days
Daylight
9 h 12 min
7:09 AM – 4:22 PM
Cloud cover
66%
9th clearest
Wind
22 km/h
2nd windiest
Solar energy
2.12 kWh/m²
Travel score
0.0
out of 10

Muroran is city in Hokkaido, Japan.

Density
1,187/km²
people per km²
Founded
1922

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 -1°C through the month.

A typical January day in Muroran reaches about -1°C in the afternoon and slips back to -4°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between -4°C and 3°C. Set against its neighbours, January runs about 2°C cooler than December and on par with February.

-10°-5°151015202531
Avg high (°C)Avg low (°C)
10-3
20-3
30-3
40-3
50-3
60-3
70-3
80-3
90-3
100-3
11-1-3
12-1-4
13-1-4
14-1-4
15-1-4
16-1-4
17-1-4
18-1-4
19-1-4
20-1-4
21-1-4
22-1-4
23-1-4
24-1-4
25-1-4
26-1-4
27-1-4
28-1-4
29-1-4
30-1-4
31-1-4

How January really feels in Muroran

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
20 feel bitter (≤ -10°C)

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

Muroran 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
Jan-1° / -4°508.510.19.30.0
Feb-0° / -4°437.4710.30.0
Mar / -1°579.1611.60.0
Apr / 769.11.513.10.5
May11° / 11211.1014.42.5
Jun15° / 12°10410.30154.5
Jul20° / 17°15313014.85.6
Aug22° / 19°18112.6013.76.0
Sep20° / 17°16613012.35.8
Oct14° / 11°10310.90.110.84.2
Nov / 80111.79.61.0
Dec / -1°69119.790.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 20% of January, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23961
33961
43862
53862
63862
73862
83763
93763
103862
113862
123961
133961
143862
153862
163862
173961
183961
193961
203961
213961
223961
233961
243961
253862
263862
273862
283961
293862
303862
313862

Chance of precipitation in January

Any precipitationSnow

Muroran gets around 50 mm of rain and snow over 8.5 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 28% and peaks near 32% on the wettest days, and about 10 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
13233
23133
33133
43033
52933
62934
72834
82834
92734
102734
112734
122734
132734
142734
152733
162733
172733
182732
192732
202731
212731
222831
232831
242831
252731
262731
272731
282730
292630
302630
312630

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 22 km/h in January.

Across January, daily wind ranges from about 21 km/h on the calmest days to 23 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
123breezy
223breezy
323breezy
423breezy
523breezy
622breezy
722breezy
822breezy
922breezy
1022breezy
1122breezy
1222breezy
1322breezy
1422breezy
1522breezy
1621breezy
1721breezy
1821breezy
1921breezy
2021breezy
2121breezy
2221breezy
2321breezy
2421breezy
2521breezy
2621breezy
2721breezy
2821breezy
2921breezy
3021breezy
3121breezy

Sunrise & sunset in January

DaylightNight

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

Days grow by about 42 minutes over January. Sunrise moves from 7:11 AM to 6:59 AM, and sunset from 4:08 PM to 4:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.07:114:08
29.07:114:09
39.07:114:09
49.07:114:10
59.07:114:11
69.07:114:12
79.07:114:13
89.17:114:14
99.17:104:15
109.17:104:16
119.17:104:17
129.17:104:18
139.27:104:19
149.27:094:20
159.27:094:21
169.27:094:22
179.37:084:23
189.37:084:24
199.37:074:26
209.37:074:27
219.47:064:28
229.47:054:29
239.47:054:30
249.57:044:31
259.57:034:33
269.57:034:34
279.67:024:35
289.67:014:36
299.67:004:38
309.77:004:39
319.76:594:40

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.12 kWh/m².

For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 5.42 kWh/m² in May across the year — January's 2.12 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
82.0Dim
92.0Dim
102.0Dim
112.0Moderate
122.0Moderate
132.0Moderate
142.0Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.1Moderate
192.1Moderate
202.2Moderate
212.2Moderate
222.2Moderate
232.2Moderate
242.3Moderate
252.3Moderate
262.3Moderate
272.4Moderate
282.4Moderate
292.4Moderate
302.5Moderate
312.5Moderate
Planning a trip in January

Hazard calendar for Muroran

In seasonPeak

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

Muroran sits in the Pacific typhoon belt; the season peaks July–October.

Muroran's rainy season runs May–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Muroran?

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

0.0
Sightseeing
9th-best month of the year
0.0
Beach & pool
7th-best month of the year

January is a weaker month for outdoor sightseeing in Muroran.

What to pack for Muroran in January

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

In January, Muroran sees daytime highs around -1°C and nights near -4°C. Pack a warm layer and a heavy coat. Worth having: rain gear and a windbreaker. About 9 days see rain.

a warm layera heavy coatrain geara windbreaker

Sea temperature near Muroran in January

The nearest coast averages about 6°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 21°C and coldest in February near 4°C.

It's comfortable for a long swim from Aug 9 to Sep 13 — about 1.2 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan6Bracing
Feb4Bracing
Mar4Bracing
Apr6Bracing
May9Bracing
Jun14Bracing
Jul18Cool
Aug21Refreshing
Sep20Refreshing
Oct17Cool
Nov12Bracing
Dec9Bracing

UV index in Muroran in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Muroran peaks around August 18 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighVery highHighModerateLowAug 18UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5High
May8Very high
Jun7High
Jul5Moderate
Aug9Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Muroran 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 Muroran is worst in April — around 17 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (December, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1216 µg/m³Dec 177 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar16Moderate
Apr17Moderate
May14Moderate
Jun9Good
Jul8Good
Aug8Good
Sep8Good
Oct9Good
Nov8Good
Dec6Good
Location & terrain

Where is Muroran?

Muroran sits at 42.3°N, 141.0°E, 8 m above sea level, in Japan. The nearest listed city is Date, 19 km away.

Topography around Muroran

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

Within 3 km, the terrain around Muroran has only modest variations in elevation — a maximum elevation change of 185 m around an average of 21 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 901 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,867 m.

The land around Muroran is covered by water (49%), trees (25%) and artificial surfaces (23%) within 3 km, water (76%) within 16 km, and trees (48%) and water (45%) within 80 km.

3 km
185 m
16 km
901 m
80 km
1,867 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Date 19 km · Noboribetsu 22 km · Shiraoi 39 km · Honchō 53 km · Yakumo 60 km · Niseko 60 km · Tomakomai 62 km · Kamiiso 62 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 Muroran (42.3172°, 140.9881°, elevation 8 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).