Itoigawa weather in January

In January, Itoigawa sees average daytime highs of 3°C and overnight lows near -0°C, with 288 mm of precipitation across 26.3 wet days and about 9.7 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 3°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 30 min at the start of January to 10 h 06 min by month's end. Set against the rest of the year, January is Itoigawa's 12th-clearest and 1st-windiest month. For the whole year in context, see Itoigawa's year-round climate.

Daytime high
12th warmest
Overnight low
-0°
2nd coldest
Precipitation
288 mm
26.3 wet days
Daylight
9 h 42 min
7:06 AM – 4:49 PM
Cloud cover
77%
12th clearest
Wind
12 km/h
1st windiest
Solar energy
2.17 kWh/m²
Travel score
0.0
out of 10

Itoigawa is city in Niigata prefecture, Japan.

Density
55/km²
people per km²
Founded
1954

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 3°C through the month.

A typical January day in Itoigawa reaches about 3°C in the afternoon and slips back to -0°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between -0°C and 6°C. Set against its neighbours, January runs about 3°C cooler than December and on par with February.

-5°10°151015202531
Avg high (°C)Avg low (°C)
141
240
340
440
540
640
740
830
930
1030
1130
1230
1330
1430
1530
1630
1730
1830
1930
2030
2130
223-1
233-1
243-1
253-1
263-1
273-1
283-1
293-1
303-1
313-1

How January really feels in Itoigawa

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.

Itoigawa weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°28826.322.89.70.0
Feb / -1°21921.818.710.60.0
Mar / 20020.512.911.70.4
Apr11° / 14314.82.412.92.6
May17° / 12°13914.20144.9
Jun21° / 17°17314.3014.55.5
Jul25° / 21°25418.8014.35.3
Aug27° / 23°19718.1013.45.3
Sep23° / 19°23518.2012.35.3
Oct18° / 14°21617.30114.7
Nov12° / 21319.12.4102.5
Dec / 27424.315.19.50.4

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 12% of January, with mostly cloudy or overcast conditions the remaining 82%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12080
22080
31981
41981
51981
61981
71981
81981
91981
101981
111981
121981
131882
141882
151882
161783
171783
181783
191783
201783
211783
221783
231783
241783
251783
261783
271783
281783
291783
301882
311882

Chance of precipitation in January

Any precipitationSnow

Itoigawa gets around 288 mm of rain and snow over 26.3 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 84% and peaks near 86% on the wettest days, and about 23 days bring snow.

0%20%40%60%80%100%151015202531
Rain chance (%)Snow chance (%)
18468
28469
38570
48570
58571
68671
78671
88672
98672
108572
118572
128572
138573
148473
158473
168474
178474
188474
198474
208474
218475
228475
238475
248476
258476
268476
278476
288476
298476
308476
318476

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, the windiest month of the year.

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
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
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 9 h 30 min at the start of January to 10 h 06 min 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 4:37 PM to 5:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.57:074:37
29.57:074:37
39.57:074:38
49.57:074:39
59.57:074:40
69.67:074:41
79.67:074:41
89.67:074:42
99.67:074:43
109.67:074:44
119.67:074:45
129.67:074:46
139.77:074:47
149.77:074:48
159.77:074:48
169.77:064:49
179.77:064:50
189.87:064:51
199.87:054:52
209.87:054:53
219.87:054:54
229.97:044:55
239.97:044:56
249.97:034:57
259.97:034:59
2610.07:025:00
2710.07:025:01
2810.07:015:02
2910.07:005:03
3010.17:005:04
3110.16:595:05

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.17 kWh/m².

For context, solar energy here swings from a low near 1.88 kWh/m² to a high of 5.67 kWh/m² in May across the year — January's 2.17 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.0Dim
22.0Dim
32.0Dim
42.0Dim
52.0Dim
62.0Moderate
72.0Moderate
82.0Moderate
92.0Moderate
102.0Moderate
112.0Moderate
122.1Moderate
132.1Moderate
142.1Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.2Moderate
192.2Moderate
202.2Moderate
212.2Moderate
222.3Moderate
232.3Moderate
242.3Moderate
252.3Moderate
262.4Moderate
272.4Moderate
282.4Moderate
292.5Moderate
302.5Moderate
312.5Moderate
Planning a trip in January

Hazard calendar for Itoigawa

In seasonPeak

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

Itoigawa 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 Itoigawa?

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

0.0
Sightseeing
11th-best month of the year
0.0
Beach & pool
9th-best month of the year

January is a weaker month for outdoor sightseeing in Itoigawa.

What to pack for Itoigawa in January

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

In January, Itoigawa sees daytime highs around 3°C and nights near -0°C. Pack a warm layer and rain gear. Worth having: a heavy coat. About 26 days see rain.

a warm layerrain geara heavy coat

Sea temperature near Itoigawa in January

The nearest coast averages about 13°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 27°C and coldest in March near 10°C.

It's comfortable for a long swim from Jun 20 to Nov 1 — about 4.4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb11Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun20Cool
Jul23Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec15Cool

UV index in Itoigawa 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 Itoigawa peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 12UV 10Dec 20UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep9Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Itoigawa 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 Itoigawa is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1721 µg/m³Dec 1510 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar20Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug13Moderate
Sep12Good
Oct11Good
Nov11Good
Dec10Good
Location & terrain

Where is Itoigawa?

Itoigawa sits at 37.0°N, 137.8°E, 15 m above sea level, in Japan. The nearest listed city is Nyūzen, 33 km away.

Topography around Itoigawa

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

Within 3 km, the terrain around Itoigawa has significant variations in elevation — a maximum elevation change of 312 m around an average of 44 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,586 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,069 m.

The land around Itoigawa is covered by trees (35%), water (30%) and artificial surfaces (24%) within 3 km, trees (50%) and water (45%) within 16 km, and trees (49%) and water (40%) within 80 km.

3 km
312 m
16 km
1,586 m
80 km
3,069 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Nyūzen 33 km · Arai 34 km · Myoko 36 km · Jōetsu 37 km · Kurobe-shi 38 km · Uozu 48 km · Iiyama 50 km · Nagano 52 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 Itoigawa (37.0333°, 137.85°, elevation 15 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).