Tomakomai weather in January

In January, Tomakomai sees average daytime highs of -2°C and overnight lows near -7°C, with 44 mm of precipitation across 7.1 wet days and about 9.2 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near -2°C through the month. The sky is clear or mostly clear about 20% of the time in January, and the air most often feels dry.

Daylight stretches from about 8 h 54 min at the start of January to 9 h 42 min by month's end. Set against the rest of the year, January is Tomakomai's 5th-clearest and 3rd-windiest month. For the whole year in context, see Tomakomai's year-round climate.

Daytime high
-2°
12th warmest
Overnight low
-7°
1st coldest
Precipitation
44 mm
7.1 wet days
Daylight
9 h 12 min
7:07 AM – 4:19 PM
Cloud cover
62%
5th clearest
Wind
12 km/h
3rd windiest
Solar energy
2.11 kWh/m²
Travel score
0.0
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near -2°C through the month.

A typical January day in Tomakomai reaches about -2°C in the afternoon and slips back to -7°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between -6°C and 1°C. Set against its neighbours, January runs about 3°C cooler than December and on par with February.

-15°-10°-5°151015202531
Avg high (°C)Avg low (°C)
1-1-6
2-1-6
3-1-6
4-1-6
5-2-7
6-2-7
7-2-7
8-2-7
9-2-7
10-2-7
11-2-7
12-2-7
13-2-7
14-2-7
15-2-8
16-2-8
17-2-8
18-2-8
19-2-8
20-2-8
21-2-8
22-2-8
23-2-8
24-2-8
25-2-8
26-2-8
27-2-8
28-2-8
29-2-8
30-2-8
31-2-8

How January really feels in Tomakomai

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
31 feel bitter (≤ -10°C)

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

Tomakomai 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-2° / -7°447.18.89.20.0
Feb-1° / -7°437.3910.30.0
Mar / -4°6310.39.311.60.0
Apr / 7811.53.213.11.1
May13° / 10911.80.114.43.2
Jun16° / 12°10011.3015.14.8
Jul20° / 16°13813.7014.85.6
Aug22° / 18°19714.5013.75.8
Sep20° / 15°17715012.35.4
Oct14° / 11011.80.210.84.0
Nov / 7810.839.60.9
Dec / -4°638.78.68.90.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 31% of January, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25149
35149
45248
55248
65248
75248
85248
95248
105248
115149
125149
135149
145149
155149
165149
175149
185149
195050
205050
215050
225050
234951
244852
254852
264852
274852
284852
294852
304852
314852

Chance of precipitation in January

Any precipitationSnow

Tomakomai gets around 44 mm of rain and snow over 7.1 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 23% and peaks near 25% on the wettest days, and about 9 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12531
22430
32430
42330
52329
62229
72228
82128
92128
102128
112128
122228
132228
142228
152328
162328
172428
182428
192429
202529
212529
222529
232529
242529
252529
262529
272529
282429
292430
302430
312430

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 12 km/h in January.

Across January, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 8 h 54 min 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 48 minutes over January. Sunrise moves from 7:09 AM to 6:57 AM, and sunset from 4:04 PM to 4:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.97:094:04
28.97:094:05
38.97:094:06
49.07:094:07
59.07:094:08
69.07:094:09
79.07:094:09
89.07:094:10
99.07:094:11
109.17:094:12
119.17:094:13
129.17:084:14
139.17:084:15
149.17:084:17
159.27:074:18
169.27:074:19
179.27:074:20
189.27:064:21
199.37:064:22
209.37:054:23
219.37:054:24
229.47:044:26
239.47:034:27
249.47:034:28
259.57:024:29
269.57:014:31
279.57:004:32
289.67:004:33
299.66:594:34
309.66:584:36
319.76:574:37

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.11 kWh/m².

For context, solar energy here swings from a low near 1.67 kWh/m² to a high of 5.41 kWh/m² in May across the year — January's 2.11 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
102.0Dim
112.0Dim
122.0Moderate
132.0Moderate
142.0Moderate
152.0Moderate
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 Tomakomai

In seasonPeak

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

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

Tomakomai'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 Tomakomai?

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 Tomakomai.

What to pack for Tomakomai in January

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

In January, Tomakomai sees daytime highs around -2°C and nights near -7°C. Pack a warm layer and a heavy coat. About 7 days see rain.

a warm layera heavy coat

Sea temperature near Tomakomai 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 20°C and coldest in March near 3°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan6Bracing
Feb4Bracing
Mar3Bracing
Apr5Bracing
May8Bracing
Jun13Bracing
Jul17Cool
Aug20Refreshing
Sep20Cool
Oct16Cool
Nov13Bracing
Dec10Bracing

UV index in Tomakomai 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 Tomakomai peaks around August 18 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighVery highHighModerateLowAug 18UV 8Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr6High
May7Very high
Jun6High
Jul5Moderate
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Tomakomai 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 Tomakomai is worst in April — around 19 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1119 µg/m³Dec 158 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb14Moderate
Mar19Moderate
Apr19Moderate
May18Moderate
Jun13Moderate
Jul12Good
Aug10Good
Sep9Good
Oct11Good
Nov9Good
Dec8Good
Location & terrain

Where is Tomakomai?

Tomakomai sits at 42.6°N, 141.6°E, 7 m above sea level, in Japan. The nearest listed city is Chitose, 21 km away.

Topography around Tomakomai

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

Within 3 km, the terrain around Tomakomai has only modest variations in elevation — a maximum elevation change of 58 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 439 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,859 m.

The land around Tomakomai is covered by artificial surfaces (47%) and water (31%) within 3 km, water (42%) and trees (41%) within 16 km, and trees (51%) and water (33%) within 80 km.

3 km
58 m
16 km
439 m
80 km
1,859 m
treesgrasslandcroplandartificial surfaceswaterwetland
January weather nearby: Chitose 21 km · Shiraoi 23 km · Eniwa 29 km · Kitahiroshima 38 km · Noboribetsu 40 km · Sapporo 52 km · Ebetsu 53 km · Muroran 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 Tomakomai (42.6369°, 141.6033°, elevation 7 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).