Okayama weather in January

In January, Okayama sees average daytime highs of 10°C and overnight lows near 2°C, with 40 mm of precipitation across 5.5 wet days and about 9.9 hours of daylight. It is the 12th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 10°C through the month. The sky is clear or mostly clear about 28% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 42 min at the start of January to 10 h 18 min by month's end. Set against the rest of the year, January is Okayama's 4th-clearest and 1st-windiest month. For the whole year in context, see Okayama's year-round climate.

Daytime high
10°
12th warmest
Overnight low
1st coldest
Precipitation
40 mm
5.5 wet days
Daylight
9 h 54 min
7:16 AM – 5:11 PM
Cloud cover
58%
4th clearest
Wind
11 km/h
1st windiest
Solar energy
2.69 kWh/m²
Travel score
2.4
out of 10
Air quality
Moderate
PM2.5 11 µg/m³ · 2010

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 10°C through the month.

A typical January day in Okayama reaches about 10°C in the afternoon and slips back to 2°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 6°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)
1112
2102
3102
4102
5102
6102
7102
8102
9102
10102
11102
12102
13102
14102
15102
16102
17102
18102
19102
20102
21101
22101
23101
24101
25101
26101
27101
28101
29101
30101
31101

How January really feels in Okayama

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.

Okayama 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
Jan10° / 405.50.39.92.4
Feb11° / 486.40.610.72.8
Mar14° / 929.30.111.74.3
Apr20° / 10°1089.7012.86.2
May24° / 15°1259.9013.86.8
Jun27° / 20°17212.2014.35.8
Jul31° / 24°18713.6014.14.0
Aug33° / 25°10810.3013.33.6
Sep29° / 21°16810.8012.25.5
Oct23° / 14°1147.7011.17.2
Nov18° / 576.1010.26.2
Dec12° / 465.30.19.73.7

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 27% of January, with mostly cloudy or overcast conditions the remaining 45%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16436
26436
36436
46337
56436
66337
76238
86238
96040
105941
115842
125743
135743
145644
155545
165347
175347
185248
195149
205149
214951
224951
234951
244951
254951
265050
274951
285050
295050
305050
315149

Chance of precipitation in January

Any precipitationSnow

Okayama gets around 40 mm of rain and snow over 5.5 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 18% and peaks near 21% on the wettest days, and about 0 day brings snow.

0%10%20%30%151015202531
Rain chance (%)Snow chance (%)
1141
2141
3141
4151
5151
6150
7150
8150
9160
10160
11171
12171
13181
14181
15191
16191
17201
18201
19201
20211
21212
22212
23212
24212
25212
26212
27212
28202
29202
30202
31192

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 42 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 36 minutes over January. Sunrise moves from 7:16 AM to 7:10 AM, and sunset from 4:59 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.77:164:59
29.77:165:00
39.77:165:00
49.77:175:01
59.87:175:02
69.87:175:03
79.87:175:03
89.87:175:04
99.87:175:05
109.87:175:06
119.87:175:07
129.87:175:07
139.97:175:08
149.97:165:09
159.97:165:10
169.97:165:11
179.97:165:12
1810.07:165:13
1910.07:155:14
2010.07:155:15
2110.07:155:16
2210.07:145:17
2310.17:145:18
2410.17:145:19
2510.17:135:19
2610.17:135:20
2710.27:125:21
2810.27:125:22
2910.27:115:23
3010.27:105:24
3110.37:105:25

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.69 kWh/m².

For context, solar energy here swings from a low near 2.41 kWh/m² to a high of 5.74 kWh/m² in May across the year — January's 2.69 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.5Moderate
22.5Moderate
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
172.6Moderate
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 Okayama

In seasonPeak

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

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

Okayama's rainy season runs March–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 Okayama?

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

2.4
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 Okayama.

What to pack for Okayama in January

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

In January, Okayama sees daytime highs around 10°C and nights near 2°C. Pack a warm layer. About 6 days see rain.

a warm layer

Sea temperature near Okayama in January

The nearest coast averages about 14°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 41 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 12 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov20Cool
Dec16Cool

UV index in Okayama 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 Okayama peaks around July 13 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJul 13UV 10Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Okayama 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 Okayama is worst in April — around 15 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 8 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Okayama's WHO annual average of 11 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1415 µg/m³Oct 168 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar14Moderate
Apr15Moderate
May14Moderate
Jun12Moderate
Jul10Good
Aug10Good
Sep9Good
Oct8Good
Nov9Good
Dec9Good
Location & terrain

Where is Okayama?

Okayama sits at 34.6°N, 133.9°E, 5 m above sea level, in Japan. The nearest listed city is Tamano, 15 km away.

Topography around Okayama

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

Within 3 km, the terrain around Okayama has only modest variations in elevation — a maximum elevation change of 171 m around an average of 13 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 503 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,811 m.

The land around Okayama is covered by artificial surfaces (79%) within 3 km, trees (41%) and artificial surfaces (26%) within 16 km, and trees (61%) and water (26%) within 80 km.

3 km
171 m
16 km
503 m
80 km
1,811 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Tamano 15 km · Sōja 17 km · Kurashiki 17 km · Setouchi 19 km · Akaiwa 20 km · Naoshima 22 km · Bizen 32 km · Takahashi 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 Okayama (34.65°, 133.9333°, elevation 5 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).