Ōyama weather in January

In January, Ōyama sees average daytime highs of 11°C and overnight lows near 8°C, with 94 mm of rain across 8.3 wet days and about 9.9 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 11°C through the month. The sky is clear or mostly clear about 58% 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 Ōyama's 2nd-clearest and 1st-windiest month. For the whole year in context, see Ōyama's year-round climate.

Daytime high: 11°; 12th warmest
Overnight low: 8°; 2nd coldest
Rainfall: 94 mm; 8.3 wet days
Daylight: 9 h 54 min; 6:59 AM – 4:54 PM
Cloud cover: 40%; 2nd clearest
Wind: 32 km/h; 1st windiest
Solar energy: 2.98 kWh/m²
Travel score: 2.8; out of 10

← December Ōyama year-round climate February →Best places to visit in January

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 11°C through the month.

A typical January day in Ōyama reaches about 11°C in the afternoon and slips back to 8°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 13°C. Set against its neighbours, January runs about 3°C cooler than December and on par with February.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	12	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	10
Avg low (°C)	9	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	7	7	7	7	7	7	7	7	7	7	7	7

	Avg high (°C)	Avg low (°C)
1	12	9
2	11	8
3	11	8
4	11	8
5	11	8
6	11	8
7	11	8
8	11	8
9	11	8
10	11	8
11	11	8
12	11	8
13	11	8
14	11	8
15	11	8
16	11	8
17	11	8
18	11	8
19	11	8
20	10	7
21	10	7
22	10	7
23	10	7
24	10	7
25	10	7
26	10	7
27	10	7
28	10	7
29	10	7
30	10	7
31	10	7

Ōyama weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	11° / 8°	94	8.3	9.9	2.8
Feb	11° / 8°	112	9.3	10.7	2.9
Mar	14° / 10°	180	12.9	11.7	3.7
Apr	17° / 14°	177	11.8	12.8	5.1
May	20° / 18°	208	11.6	13.8	6.0
Jun	22° / 21°	290	14.5	14.3	5.6
Jul	26° / 24°	240	13.6	14.1	6.1
Aug	27° / 26°	137	13.2	13.3	6.2
Sep	25° / 24°	240	15.6	12.2	5.9
Oct	22° / 20°	259	14.1	11.1	6.1
Nov	18° / 15°	160	12.1	10.2	5.6
Dec	13° / 10°	94	9.5	9.7	4.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 58% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 13% of January, with mostly cloudy or overcast conditions the remaining 30%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	76	76	76	76	75	75	74	74	73	72	71	70	70	69	68	67	67	66	66	66	66	67	67	68	68	69	68	69	69	70	70
Cloudier (%)	24	24	24	24	25	25	26	26	27	28	29	30	30	31	32	33	33	34	34	34	34	33	33	32	32	31	32	31	31	30	30

	Clearer (%)	Cloudier (%)
1	76	24
2	76	24
3	76	24
4	76	24
5	75	25
6	75	25
7	74	26
8	74	26
9	73	27
10	72	28
11	71	29
12	70	30
13	70	30
14	69	31
15	68	32
16	67	33
17	67	33
18	66	34
19	66	34
20	66	34
21	66	34
22	67	33
23	67	33
24	68	32
25	68	32
26	69	31
27	68	32
28	69	31
29	69	31
30	70	30
31	70	30

Chance of precipitation in January

Any precipitation

Ōyama gets around 94 mm of rain over 8.3 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 30% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	25	25	25	25	25	25	26	26	27	27	28	29	29	29	30	30	30	30	29	29	29	29	29	28	28	28	28	28	28	28	28

	Rain chance (%)
1	25
2	25
3	25
4	25
5	25
6	25
7	26
8	26
9	27
10	27
11	28
12	29
13	29
14	29
15	30
16	30
17	30
18	30
19	29
20	29
21	29
22	29
23	29
24	28
25	28
26	28
27	28
28	28
29	28
30	28
31	28

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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

Wind in January

Winds average 32 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 31 km/h on the calmest days to 32 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	32	32	32	32	32	32	32	32	32	32	32	32	32	31	31	31	31	31	31	32	32	32	32	32	32	32	32	32	32	32	32
Feels	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy	windy

	Wind speed (km/h)	Feels
1	32	windy
2	32	windy
3	32	windy
4	32	windy
5	32	windy
6	32	windy
7	32	windy
8	32	windy
9	32	windy
10	32	windy
11	32	windy
12	32	windy
13	32	windy
14	31	windy
15	31	windy
16	31	windy
17	31	windy
18	31	windy
19	31	windy
20	32	windy
21	32	windy
22	32	windy
23	32	windy
24	32	windy
25	32	windy
26	32	windy
27	32	windy
28	32	windy
29	32	windy
30	32	windy
31	32	windy

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 6:59 AM to 6:53 AM, and sunset from 4:42 PM to 5:08 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	9.7	9.7	9.7	9.7	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.9	9.9	9.9	9.9	9.9	9.9	10.0	10.0	10.0	10.0	10.0	10.1	10.1	10.1	10.1	10.2	10.2	10.2	10.2	10.3
Sunrise (AM)	6:59	6:59	6:59	6:59	6:59	6:59	7:00	7:00	7:00	7:00	7:00	6:59	6:59	6:59	6:59	6:59	6:59	6:58	6:58	6:58	6:57	6:57	6:57	6:56	6:56	6:55	6:55	6:54	6:54	6:53	6:53
Sunset (PM)	4:42	4:43	4:43	4:44	4:45	4:46	4:46	4:47	4:48	4:49	4:50	4:50	4:51	4:52	4:53	4:54	4:55	4:56	4:57	4:58	4:59	5:00	5:01	5:01	5:02	5:03	5:04	5:05	5:06	5:07	5:08

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.7	6:59	4:42
2	9.7	6:59	4:43
3	9.7	6:59	4:43
4	9.7	6:59	4:44
5	9.8	6:59	4:45
6	9.8	6:59	4:46
7	9.8	7:00	4:46
8	9.8	7:00	4:47
9	9.8	7:00	4:48
10	9.8	7:00	4:49
11	9.8	7:00	4:50
12	9.9	6:59	4:50
13	9.9	6:59	4:51
14	9.9	6:59	4:52
15	9.9	6:59	4:53
16	9.9	6:59	4:54
17	9.9	6:59	4:55
18	10.0	6:58	4:56
19	10.0	6:58	4:57
20	10.0	6:58	4:58
21	10.0	6:57	4:59
22	10.0	6:57	5:00
23	10.1	6:57	5:01
24	10.1	6:56	5:01
25	10.1	6:56	5:02
26	10.1	6:55	5:03
27	10.2	6:55	5:04
28	10.2	6:54	5:05
29	10.2	6:54	5:06
30	10.2	6:53	5:07
31	10.3	6:53	5:08

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.98 kWh/m².

For context, solar energy here swings from a low near 2.6 kWh/m² to a high of 5.59 kWh/m² in May across the year — January's 2.98 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	2.8	2.8	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	2.9	3.0	3.0	3.0	3.0	3.1	3.1	3.1	3.2	3.2	3.2	3.3	3.3
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	2.8	Moderate
2	2.8	Moderate
3	2.9	Moderate
4	2.9	Moderate
5	2.9	Moderate
6	2.9	Moderate
7	2.9	Moderate
8	2.9	Moderate
9	2.9	Moderate
10	2.9	Moderate
11	2.9	Moderate
12	2.9	Moderate
13	2.9	Moderate
14	2.9	Moderate
15	2.9	Moderate
16	2.9	Moderate
17	2.9	Moderate
18	2.9	Moderate
19	2.9	Moderate
20	3.0	Moderate
21	3.0	Moderate
22	3.0	Moderate
23	3.0	Moderate
24	3.1	Moderate
25	3.1	Moderate
26	3.1	Moderate
27	3.2	Moderate
28	3.2	Moderate
29	3.2	Moderate
30	3.3	Moderate
31	3.3	Moderate

Planning a trip in January

Hazard calendar for Ōyama

In seasonPeak

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

Ōyama 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 Ōyama?

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

2.8

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 Ōyama.

What to pack for Ōyama in January

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

In January, Ōyama sees daytime highs around 11°C and nights near 8°C. Pack a warm layer and a windbreaker. Worth having: rain gear. About 8 days see rain.

a warm layera windbreakerrain gear

Sea temperature near Ōyama 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 16°C.

It's comfortable for a long swim from May 25 to Nov 29 — about 6.2 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	16	16	16	17	19	22	25	27	26	24	21	19
Comfort	Cool	Cool	Cool	Cool	Cool	Refreshing	Warm	Warm	Warm	Refreshing	Refreshing	Cool

	Sea temperature (°C)	Comfort
Jan	16	Cool
Feb	16	Cool
Mar	16	Cool
Apr	17	Cool
May	19	Cool
Jun	22	Refreshing
Jul	25	Warm
Aug	27	Warm
Sep	26	Warm
Oct	24	Refreshing
Nov	21	Refreshing
Dec	19	Cool

UV index in Ōyama 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 Ōyama peaks around July 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 3 (moderate).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	3	4	5	7	9	10	10	10	9	6	4	3
Level	Moderate	Moderate	Moderate	High	Very high	Very high	Extreme	Very high	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	3	Moderate
Feb	4	Moderate
Mar	5	Moderate
Apr	7	High
May	9	Very high
Jun	10	Very high
Jul	10	Extreme
Aug	10	Very high
Sep	9	Very high
Oct	6	High
Nov	4	Moderate
Dec	3	Moderate

Air quality in Ōyama 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 Ōyama is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	11	14	19	21	19	16	12	11	10	11	10	9
Level	Good	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	11	Good
Feb	14	Moderate
Mar	19	Moderate
Apr	21	Moderate
May	19	Moderate
Jun	16	Moderate
Jul	12	Good
Aug	11	Good
Sep	10	Good
Oct	11	Good
Nov	10	Good
Dec	9	Good

Location & terrain

Where is Ōyama?

Ōyama sits at 34.6°N, 138.2°E, 50 m above sea level, in Japan. The nearest listed city is Omaezaki, 1.0 km away.

Topography around Ōyama

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

Within 3 km, the terrain around Ōyama has only modest variations in elevation — a maximum elevation change of 51 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 154 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,311 m.

The land around Ōyama is covered by water (70%) within 3 km, water (80%) within 16 km, and water (55%) and trees (37%) within 80 km.

3 km

51 m

water 70%

16 km

154 m

water 80%

80 km

2,311 m

water 55%

treesgrasslandcroplandartificial surfacesbare terrainwater

← December Ōyama year-round climate February →Best places to visit in January

January weather nearby: Omaezaki 1.0 km · Sagara 9.0 km · Kikugawa 14 km · Maruobara 17 km · Sumiyoshi 17 km · Shimada 24 km · Kanaya 25 km · Kakegawa 26 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

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 Ōyama (34.6036°, 138.2172°, elevation 50 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).

	Avg high (°C)	Avg low (°C)
1	12	9
2	11	8
3	11	8
4	11	8
5	11	8
6	11	8
7	11	8
8	11	8
9	11	8
10	11	8
11	11	8
12	11	8
13	11	8
14	11	8
15	11	8
16	11	8
17	11	8
18	11	8
19	11	8
20	10	7
21	10	7
22	10	7
23	10	7
24	10	7
25	10	7
26	10	7
27	10	7
28	10	7
29	10	7
30	10	7
31	10	7

	Clearer (%)	Cloudier (%)
1	76	24
2	76	24
3	76	24
4	76	24
5	75	25
6	75	25
7	74	26
8	74	26
9	73	27
10	72	28
11	71	29
12	70	30
13	70	30
14	69	31
15	68	32
16	67	33
17	67	33
18	66	34
19	66	34
20	66	34
21	66	34
22	67	33
23	67	33
24	68	32
25	68	32
26	69	31
27	68	32
28	69	31
29	69	31
30	70	30
31	70	30

	Rain chance (%)
1	25
2	25
3	25
4	25
5	25
6	25
7	26
8	26
9	27
10	27
11	28
12	29
13	29
14	29
15	30
16	30
17	30
18	30
19	29
20	29
21	29
22	29
23	29
24	28
25	28
26	28
27	28
28	28
29	28
30	28
31	28

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	12	9
2	11	8
3	11	8
4	11	8
5	11	8
6	11	8
7	11	8
8	11	8
9	11	8
10	11	8
11	11	8
12	11	8
13	11	8
14	11	8
15	11	8
16	11	8
17	11	8
18	11	8
19	11	8
20	10	7
21	10	7
22	10	7
23	10	7
24	10	7
25	10	7
26	10	7
27	10	7
28	10	7
29	10	7
30	10	7
31	10	7

	Clearer (%)	Cloudier (%)
1	76	24
2	76	24
3	76	24
4	76	24
5	75	25
6	75	25
7	74	26
8	74	26
9	73	27
10	72	28
11	71	29
12	70	30
13	70	30
14	69	31
15	68	32
16	67	33
17	67	33
18	66	34
19	66	34
20	66	34
21	66	34
22	67	33
23	67	33
24	68	32
25	68	32
26	69	31
27	68	32
28	69	31
29	69	31
30	70	30
31	70	30

	Rain chance (%)
1	25
2	25
3	25
4	25
5	25
6	25
7	26
8	26
9	27
10	27
11	28
12	29
13	29
14	29
15	30
16	30
17	30
18	30
19	29
20	29
21	29
22	29
23	29
24	28
25	28
26	28
27	28
28	28
29	28
30	28
31	28

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	12	9
2	11	8
3	11	8
4	11	8
5	11	8
6	11	8
7	11	8
8	11	8
9	11	8
10	11	8
11	11	8
12	11	8
13	11	8
14	11	8
15	11	8
16	11	8
17	11	8
18	11	8
19	11	8
20	10	7
21	10	7
22	10	7
23	10	7
24	10	7
25	10	7
26	10	7
27	10	7
28	10	7
29	10	7
30	10	7
31	10	7

	Clearer (%)	Cloudier (%)
1	76	24
2	76	24
3	76	24
4	76	24
5	75	25
6	75	25
7	74	26
8	74	26
9	73	27
10	72	28
11	71	29
12	70	30
13	70	30
14	69	31
15	68	32
16	67	33
17	67	33
18	66	34
19	66	34
20	66	34
21	66	34
22	67	33
23	67	33
24	68	32
25	68	32
26	69	31
27	68	32
28	69	31
29	69	31
30	70	30
31	70	30

	Rain chance (%)
1	25
2	25
3	25
4	25
5	25
6	25
7	26
8	26
9	27
10	27
11	28
12	29
13	29
14	29
15	30
16	30
17	30
18	30
19	29
20	29
21	29
22	29
23	29
24	28
25	28
26	28
27	28
28	28
29	28
30	28
31	28

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100