Yamaguchi weather in January

In January, Yamaguchi sees average daytime highs of 9°C and overnight lows near 2°C, with 62 mm of precipitation across 9.7 wet days and about 10 hours of daylight. It is the 12th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 9°C through the month. The sky is clear or mostly clear about 13% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 48 min at the start of January to 10 h 18 min by month's end. Set against the rest of the year, January is Yamaguchi's 10th-clearest and 1st-windiest month. For the whole year in context, see Yamaguchi's year-round climate.

Daytime high
12th warmest
Overnight low
1st coldest
Precipitation
62 mm
9.7 wet days
Daylight
10 hours
7:25 AM – 5:22 PM
Cloud cover
67%
10th clearest
Wind
11 km/h
1st windiest
Solar energy
2.4 kWh/m²
Travel score
1.7
out of 10

Yamaguchi is capital city of Yamaguchi prefecture.

Density
190/km²
people per km²
Founded
1929

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 9°C through the month.

A typical January day in Yamaguchi reaches about 9°C in the afternoon and slips back to 2°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 5°C and 13°C. Set against its neighbours, January runs about 2°C cooler than December and about 1°C cooler than February.

-5°10°15°151015202531
Avg high (°C)Avg low (°C)
1103
2103
3103
493
592
692
792
892
992
1092
1192
1292
1392
1492
1592
1692
1792
1892
1992
2092
2192
2292
2392
2492
2592
2692
2792
2892
2992
3092
3192

How January really feels in Yamaguchi

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.

Yamaguchi weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 629.72.2101.7
Feb10° / 709.81.810.72.2
Mar14° / 11711.40.411.73.8
Apr19° / 13010.6012.85.9
May23° / 14°15010.5013.86.7
Jun26° / 19°24914.3014.25.7
Jul30° / 23°28316.30144.2
Aug31° / 24°16714.2013.33.9
Sep28° / 20°17812.4012.25.7
Oct23° / 14°978.1011.17.1
Nov17° / 788.2010.25.6
Dec11° / 649.70.99.82.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 25% of January, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24456
34456
44456
54357
64357
74357
84159
94159
104060
113961
123961
133862
143763
153763
163565
173565
183565
193466
203466
213367
223367
233367
243367
253367
263367
273466
283565
293664
303664
313664

Chance of precipitation in January

Any precipitationSnow

Yamaguchi gets around 62 mm of rain and snow over 9.7 wet days in January, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 32% and peaks near 34% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1297
2297
3297
4297
5297
6297
7297
8297
9297
10307
11306
12316
13316
14326
15326
16336
17337
18337
19347
20347
21347
22347
23348
24348
25348
26348
27348
28348
29348
30348
31348

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 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
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 48 min at the start of January to 10 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over January. Sunrise moves from 7:25 AM to 7:19 AM, and sunset from 5:10 PM to 5:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.87:255:10
29.87:255:11
39.87:255:11
49.87:255:12
59.87:255:13
69.87:255:14
79.87:255:14
89.87:265:15
99.87:265:16
109.97:265:17
119.97:255:18
129.97:255:18
139.97:255:19
149.97:255:20
159.97:255:21
1610.07:255:22
1710.07:255:23
1810.07:245:24
1910.07:245:25
2010.07:245:26
2110.17:245:27
2210.17:235:28
2310.17:235:28
2410.17:225:29
2510.17:225:30
2610.27:215:31
2710.27:215:32
2810.27:205:33
2910.27:205:34
3010.37:195:35
3110.37:195:36

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.4 kWh/m².

For context, solar energy here swings from a low near 2.17 kWh/m² to a high of 5.6 kWh/m² in May across the year — January's 2.4 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.3Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.3Moderate
62.3Moderate
72.3Moderate
82.3Moderate
92.3Moderate
102.3Moderate
112.3Moderate
122.3Moderate
132.3Moderate
142.3Moderate
152.3Moderate
162.3Moderate
172.4Moderate
182.4Moderate
192.4Moderate
202.4Moderate
212.4Moderate
222.5Moderate
232.5Moderate
242.5Moderate
252.5Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.7Moderate
302.7Moderate
312.7Moderate
Planning a trip in January

Hazard calendar for Yamaguchi

In seasonPeak

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

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

Yamaguchi's rainy season runs April–September, 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 Yamaguchi?

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

1.7
Sightseeing
12th-best month of the year
0.0
Beach & pool
11th-best month of the year

January is a weaker month for outdoor sightseeing in Yamaguchi.

What to pack for Yamaguchi in January

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

In January, Yamaguchi sees daytime highs around 9°C and nights near 2°C. Pack a warm layer. Worth having: rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Yamaguchi 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 at the nearest coast (about 35 km away) is warmest in August at about 27°C and coldest in February near 12°C.

It's comfortable for a long swim from Jun 7 to Nov 11 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar12Bracing
Apr14Bracing
May17Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Cool
Dec16Cool

UV index in Yamaguchi in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yamaguchi peaks around June 21 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJun 21UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Yamaguchi 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 Yamaguchi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1023 µg/m³Oct 1111 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr23Moderate
May20Moderate
Jun16Moderate
Jul13Moderate
Aug15Moderate
Sep11Good
Oct11Good
Nov13Moderate
Dec12Moderate
Location & terrain

Where is Yamaguchi?

Yamaguchi sits at 34.2°N, 131.5°E, 157 m above sea level, in Japan. The nearest listed city is Ogōri-shimogō, 11 km away.

Topography around Yamaguchi

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

Within 3 km, the terrain around Yamaguchi has significant variations in elevation — a maximum elevation change of 424 m around an average of 118 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 780 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,369 m.

The land around Yamaguchi is covered by trees (60%) and artificial surfaces (35%) within 3 km, trees (83%) within 16 km, and water (51%) and trees (42%) within 80 km.

3 km
424 m
16 km
780 m
80 km
1,369 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Ogōri-shimogō 11 km · Hōfu 17 km · Mine 23 km · Hagi 25 km · Sanyōonoda 33 km · Onoda 33 km · Nagato 33 km · Ube 33 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 Yamaguchi (34.1833°, 131.4667°, elevation 157 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).