Nagaoka weather in January

In January, Nagaoka sees average daytime highs of 5°C and overnight lows near -0°C, with 179 mm of precipitation across 25 wet days and about 9.7 hours of daylight. It is the 12th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 5°C through the month. The sky is clear or mostly clear about 4% 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 Nagaoka's 12th-clearest and 1st-windiest month. For the whole year in context, see Nagaoka's year-round climate.

Daytime high
12th warmest
Overnight low
-0°
2nd coldest
Precipitation
179 mm
25 wet days
Daylight
9 h 42 min
7:03 AM – 4:44 PM
Cloud cover
77%
12th clearest
Wind
11 km/h
1st windiest
Solar energy
2.12 kWh/m²
Travel score
0.1
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 5°C through the month.

A typical January day in Nagaoka reaches about 5°C in the afternoon and slips back to -0°C overnight — a 5°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°151015202531
Avg high (°C)Avg low (°C)
161
261
360
460
560
660
750
850
950
1050
1150
1250
1350
1450
1550
1650
175-1
185-1
195-1
205-1
215-1
225-1
235-1
245-1
255-1
265-1
275-1
285-1
295-1
305-1
315-1

How January really feels in Nagaoka

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.

Nagaoka weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°1792518.29.70.1
Feb / -0°12620.514.610.60.3
Mar10° / 12619.67.611.71.8
Apr16° / 9414.30.812.94.6
May22° / 12°9411.90146.3
Jun26° / 17°11512.5014.56.1
Jul29° / 22°20716.1014.34.6
Aug31° / 23°14614.1013.44.1
Sep27° / 19°14414012.35.6
Oct20° / 12°14314.80115.7
Nov14° / 14518.20.6103.3
Dec / 18123.7109.50.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of January, with mostly cloudy or overcast conditions the remaining 82%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12179
22080
31981
41981
51981
61981
71981
81882
91882
101882
111783
121783
131783
141684
151684
161684
171684
181684
191684
201783
211783
221783
231783
241783
251783
261783
271882
281981
291981
301981
312080

Chance of precipitation in January

Any precipitationSnow

Nagaoka gets around 179 mm of rain and snow over 25 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 80% and peaks near 81% on the wettest days, and about 18 days bring snow.

0%20%40%60%80%151015202531
Rain chance (%)Snow chance (%)
18050
28051
38052
48053
58154
68155
78155
88156
98056
108057
118057
128057
138057
148058
157958
167958
177959
187959
197959
208059
218060
228060
238061
248162
258162
268163
278163
288164
298164
308164
318163

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

Across January, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

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 7:04 AM to 6:56 AM, and sunset from 4:32 PM to 5:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.57:044:32
29.57:044:32
39.57:044:33
49.57:044:34
59.57:054:35
69.57:054:35
79.57:054:36
89.57:054:37
99.67:054:38
109.67:044:39
119.67:044:40
129.67:044:41
139.67:044:42
149.67:044:42
159.77:044:43
169.77:034:44
179.77:034:45
189.77:034:46
199.77:024:47
209.87:024:48
219.87:024:49
229.87:014:50
239.87:014:51
249.97:004:52
259.97:004:54
269.96:594:55
2710.06:594:56
2810.06:584:57
2910.06:574:58
3010.06:574:59
3110.16:565:00

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 1.74 kWh/m² to a high of 5.68 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
81.9Dim
91.9Dim
101.9Dim
112.0Dim
122.0Dim
132.0Moderate
142.0Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.1Moderate
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 Nagaoka

In seasonPeak

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

Nagaoka 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 Nagaoka?

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

0.1
Sightseeing
12th-best month of the year
0.0
Beach & pool
10th-best month of the year

January is a weaker month for outdoor sightseeing in Nagaoka.

What to pack for Nagaoka in January

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

In January, Nagaoka sees daytime highs around 5°C and nights near -0°C. Pack a warm layer and rain gear. Worth having: a heavy coat. About 25 days see rain.

a warm layerrain geara heavy coat

Sea temperature near Nagaoka 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 at the nearest coast (about 22 km away) is warmest in August at about 27°C and coldest in March near 10°C.

It's comfortable for a long swim from Jun 21 to Oct 31 — about 4.4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun20Cool
Jul23Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov18Cool
Dec15Cool

UV index in Nagaoka 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 Nagaoka peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 12UV 10Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Nagaoka 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 Nagaoka is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1723 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar22Moderate
Apr23Moderate
May22Moderate
Jun19Moderate
Jul17Moderate
Aug14Moderate
Sep12Moderate
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Nagaoka?

Nagaoka sits at 37.5°N, 138.8°E, 23 m above sea level, in Japan. The nearest listed city is Mitsuke, 12 km away.

Topography around Nagaoka

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

Within 3 km, the terrain around Nagaoka has only modest variations in elevation — a maximum elevation change of 53 m around an average of 23 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 741 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,314 m.

The land around Nagaoka is covered by artificial surfaces (64%) within 3 km, trees (59%) and cropland (25%) within 16 km, and trees (56%) and water (32%) within 80 km.

3 km
53 m
16 km
741 m
80 km
2,314 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Mitsuke 12 km · Tochio-honchō 13 km · Ojiya 17 km · Sanjō 21 km · Tsubame 25 km · Uonuma 25 km · Yoshida-kasugachō 26 km · Kashiwazaki 28 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 Nagaoka (37.45°, 138.85°, elevation 23 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).