Kainan weather in January

In January, Kainan sees average daytime highs of 9°C and overnight lows near 4°C, with 82 mm of precipitation across 11.4 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 23% 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 Kainan's 6th-clearest and 1st-windiest month. For the whole year in context, see Kainan's year-round climate.

Daytime high
12th warmest
Overnight low
1st coldest
Precipitation
82 mm
11.4 wet days
Daylight
10 hours
7:10 AM – 5:07 PM
Cloud cover
59%
6th clearest
Wind
15 km/h
1st windiest
Solar energy
2.71 kWh/m²
Travel score
1.8
out of 10

Kainan is city in Wakayama Prefecture, Japan.

Density
479/km²
people per km²
Founded
2005

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 Kainan reaches about 9°C in the afternoon and slips back to 4°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 12°C. Set against its neighbours, January runs about 3°C cooler than December and about 1°C cooler than February.

10°15°151015202531
Avg high (°C)Avg low (°C)
1104
2104
3104
4104
5104
694
794
894
994
1094
1194
1294
1394
1494
1594
1694
1794
1894
1993
2093
2193
2293
2393
2493
2593
2693
2793
2893
2993
3093
3193

How January really feels in Kainan

Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 16 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
16
wind chill below the day's low

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

Kainan 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 / 8211.41.6101.8
Feb10° / 8510.71.710.72.1
Mar13° / 12512.50.211.73.5
Apr18° / 11°12611012.85.6
May22° / 15°14910.7013.86.5
Jun25° / 20°23214.1014.25.8
Jul29° / 24°19513.50145.1
Aug30° / 25°11411.4013.34.7
Sep27° / 22°18213012.25.8
Oct22° / 16°17910.9011.16.7
Nov17° / 11°1008.8010.25.5
Dec12° / 8610.70.89.83.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 30% of January, with mostly cloudy or overcast conditions the remaining 47%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26139
36139
46040
56139
66040
75941
85941
95842
105743
115644
125545
135545
145446
155347
165248
175149
185149
195050
204951
214951
224951
234852
244852
254852
264852
274852
284852
294951
304951
315050

Chance of precipitation in January

Any precipitationSnow

Kainan gets around 82 mm of rain and snow over 11.4 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 37% and peaks near 41% on the wettest days, and about 2 days bring snow. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1344
2344
3334
4334
5334
6324
7324
8324
9335
10335
11345
12345
13355
14365
15366
16376
17386
18396
19406
20407
21417
22417
23417
24417
25417
26417
27417
28408
29408
30398
31398

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

Across January, daily wind ranges from about 15 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

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 7:10 AM to 7:04 AM, and sunset from 4:55 PM to 5:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.87:104:55
29.87:104:56
39.87:104:56
49.87:104:57
59.87:104:58
69.87:104:59
79.87:104:59
89.87:105:00
99.87:105:01
109.97:105:02
119.97:105:03
129.97:105:04
139.97:105:04
149.97:105:05
159.97:105:06
1610.07:105:07
1710.07:105:08
1810.07:095:09
1910.07:095:10
2010.07:095:11
2110.17:085:12
2210.17:085:13
2310.17:085:14
2410.17:075:14
2510.17:075:15
2610.27:065:16
2710.27:065:17
2810.27:055:18
2910.27:055:19
3010.37:045:20
3110.37:045:21

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.71 kWh/m².

For context, solar energy here swings from a low near 2.43 kWh/m² to a high of 5.56 kWh/m² in May across the year — January's 2.71 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.6Moderate
22.6Moderate
32.6Moderate
42.6Moderate
52.6Moderate
62.6Moderate
72.6Moderate
82.6Moderate
92.6Moderate
102.6Moderate
112.6Moderate
122.6Moderate
132.6Moderate
142.6Moderate
152.6Moderate
162.6Moderate
172.7Moderate
182.7Moderate
192.7Moderate
202.7Moderate
212.7Moderate
222.8Moderate
232.8Moderate
242.8Moderate
252.8Moderate
262.9Moderate
272.9Moderate
282.9Moderate
292.9Moderate
303.0Moderate
313.0Moderate
Planning a trip in January

Hazard calendar for Kainan

In seasonPeak

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

Kainan 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 Kainan?

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

1.8
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 Kainan.

What to pack for Kainan in January

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

In January, Kainan sees daytime highs around 9°C and nights near 4°C. Pack a warm layer. Worth having: rain gear. About 11 days see rain.

a warm layerrain gear

Sea temperature near Kainan in January

The nearest coast averages about 16°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 February near 14°C.

It's comfortable for a long swim from May 31 to Nov 23 — about 5.8 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb14Bracing
Mar15Bracing
Apr16Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov21Refreshing
Dec18Cool

UV index in Kainan 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 Kainan peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highExtremeVery highModerateJun 23UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul10Extreme
Aug7High
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Kainan 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 Kainan is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1625 µg/m³Oct 1914 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar24Moderate
Apr26Moderate
May24Moderate
Jun21Moderate
Jul22Moderate
Aug24Moderate
Sep17Moderate
Oct14Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Kainan?

Kainan sits at 34.2°N, 135.2°E, 3 m above sea level, in Japan. The nearest listed city is Minato, 9.0 km away.

Topography around Kainan

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

Within 3 km, the terrain around Kainan has significant variations in elevation — a maximum elevation change of 535 m around an average of 93 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 881 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,878 m.

The land around Kainan is covered by trees (56%) and artificial surfaces (31%) within 3 km, trees (53%) and water (24%) within 16 km, and trees (46%) and water (40%) within 80 km.

3 km
535 m
16 km
881 m
80 km
1,878 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Minato 9.0 km · Wakayama 10 km · Arida 12 km · Itogawa 14 km · Iwade 14 km · Hannan 20 km · Kinokawa 22 km · Sennan 22 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 Kainan (34.1517°, 135.214°, elevation 3 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).