Ōmura weather in January

In January, Ōmura sees average daytime highs of 9°C and overnight lows near 6°C, with 65 mm of precipitation across 7.9 wet days and about 10.1 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 19% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of January to 10 h 24 min by month's end. Set against the rest of the year, January is Ōmura's 10th-clearest and 1st-windiest month. For the whole year in context, see Ōmura's year-round climate.

Daytime high
12th warmest
Overnight low
1st coldest
Precipitation
65 mm
7.9 wet days
Daylight
10 h 06 min
7:28 AM – 5:31 PM
Cloud cover
66%
10th clearest
Wind
14 km/h
1st windiest
Solar energy
2.29 kWh/m²
Travel score
2.1
out of 10

Ōmura is city in Nagasaki Prefecture, Japan.

Density
753/km²
people per km²
Founded
1942

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 Ōmura reaches about 9°C in the afternoon and slips back to 6°C overnight — a 4°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 3°C cooler than December and about 1°C cooler than February.

10°15°151015202531
Avg high (°C)Avg low (°C)
1106
2106
3106
4106
5106
6106
7106
8106
9106
10106
11106
12106
1396
1496
1596
1696
1796
1896
1996
2095
2195
2295
2395
2495
2595
2695
2795
2895
2995
3095
3195

How January really feels in Ōmura

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

January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Ōmura 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 / 657.90.510.12.1
Feb10° / 838.40.310.82.4
Mar13° / 13111011.73.7
Apr18° / 13°15010.8012.85.5
May22° / 17°17310.6013.76.4
Jun25° / 21°38116014.15.6
Jul28° / 25°309170144.9
Aug30° / 26°17915013.24.7
Sep27° / 23°18811.5012.26.3
Oct22° / 18°1107011.27.3
Nov17° / 13°947.7010.35.8
Dec12° / 767.709.93.3

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 18% of January, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24258
34258
44258
54060
64060
73961
83862
93763
103664
113664
123466
133466
143466
153367
163466
173466
183466
193367
203367
213466
223367
233367
243466
253565
263565
273565
283565
293565
303664
313763

Chance of precipitation in January

Any precipitationSnow

Ōmura gets around 65 mm of rain and snow over 7.9 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 26% and peaks near 29% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1221
2221
3221
4221
5221
6221
7221
8221
9231
10231
11241
12241
13251
14261
15262
16272
17272
18282
19282
20282
21292
22292
23292
24292
25292
26292
27282
28282
29282
30272
31272

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 (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
14991
15991
16991
17991
18991
19991
20991
21991
22991
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in January

Winds average 14 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 54 min at the start of January to 10 h 24 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 7:27 AM to 7:22 AM, and sunset from 5:19 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.97:275:19
29.97:285:20
39.97:285:21
49.97:285:21
59.97:285:22
69.97:285:23
79.97:285:24
89.97:285:24
99.97:285:25
1010.07:285:26
1110.07:285:27
1210.07:285:28
1310.07:285:28
1410.07:285:29
1510.07:285:30
1610.17:285:31
1710.17:285:32
1810.17:285:33
1910.17:275:34
2010.17:275:35
2110.17:275:35
2210.27:265:36
2310.27:265:37
2410.27:265:38
2510.27:255:39
2610.37:255:40
2710.37:245:41
2810.37:245:42
2910.37:235:43
3010.37:235:44
3110.47:225:45

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.29 kWh/m².

For context, solar energy here swings from a low near 2.15 kWh/m² to a high of 5.31 kWh/m² in May across the year — January's 2.29 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.2Moderate
22.2Moderate
32.2Moderate
42.2Moderate
52.2Moderate
62.2Moderate
72.2Moderate
82.2Moderate
92.2Moderate
102.2Moderate
112.2Moderate
122.2Moderate
132.2Moderate
142.2Moderate
152.2Moderate
162.2Moderate
172.2Moderate
182.3Moderate
192.3Moderate
202.3Moderate
212.3Moderate
222.4Moderate
232.4Moderate
242.4Moderate
252.4Moderate
262.5Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.6Moderate
312.6Moderate
Planning a trip in January

Hazard calendar for Ōmura

In seasonPeak

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

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

Ōmura's rainy season runs May–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 Ōmura?

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

2.1
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 Ōmura.

What to pack for Ōmura in January

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

In January, Ōmura sees daytime highs around 9°C and nights near 6°C. Pack a warm layer. About 8 days see rain.

a warm layer

Sea temperature near Ōmura 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 at the nearest coast (about 31 km away) is warmest in August at about 27°C and coldest in February near 15°C.

It's comfortable for a long swim from May 27 to Nov 29 — about 6.1 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar16Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov21Refreshing
Dec19Cool

UV index in Ōmura in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ōmura peaks around July 16 at about 10 (extreme) — 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 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJul 16UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun9Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Ōmura 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 Ōmura is worst in April — around 24 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateGoodModerateApr 1324 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr24Moderate
May21Moderate
Jun17Moderate
Jul12Good
Aug12Moderate
Sep12Good
Oct11Good
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Ōmura?

Ōmura sits at 32.9°N, 130.0°E, 17 m above sea level, in Japan. The nearest listed city is Isahaya, 12 km away.

Topography around Ōmura

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

Within 3 km, the terrain around Ōmura has only modest variations in elevation — a maximum elevation change of 229 m around an average of 33 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,058 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,406 m.

The land around Ōmura is covered by artificial surfaces (48%) and water (24%) within 3 km, trees (52%) and water (32%) within 16 km, and water (55%) and trees (32%) within 80 km.

3 km
229 m
16 km
1,058 m
80 km
1,406 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Isahaya 12 km · Obita 13 km · Togitsu 14 km · Nagasaki 20 km · Ureshinomachi-shimojuku 22 km · Kashima 24 km · Saikai 26 km · Arita 30 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 Ōmura (32.9214°, 129.9539°, elevation 17 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).