Nagasu weather in January

In January, Nagasu sees average daytime highs of 11°C and overnight lows near 4°C, with 62 mm of precipitation across 8.1 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 11°C through the month. The sky is clear or mostly clear about 18% 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 Nagasu's 10th-clearest and 1st-windiest month. For the whole year in context, see Nagasu's year-round climate.

Daytime high
11°
12th warmest
Overnight low
1st coldest
Precipitation
62 mm
8.1 wet days
Daylight
10 hours
7:26 AM – 5:29 PM
Cloud cover
67%
10th clearest
Wind
11 km/h
1st windiest
Solar energy
2.38 kWh/m²
Travel score
2.6
out of 10

Nagasu is town in Tamana district, Kumamoto prefecture, Japan.

Density
830/km²
people per km²
Founded
1957

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 11°C through the month.

A typical January day in Nagasu reaches about 11°C in the afternoon and slips back to 4°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 14°C. Set against its neighbours, January runs about 2°C cooler than December and about 1°C cooler than February.

10°15°151015202531
Avg high (°C)Avg low (°C)
1115
2115
3115
4115
5115
6115
7115
8115
9115
10115
11114
12114
13114
14104
15104
16104
17104
18104
19104
20104
21104
22104
23104
24104
25104
26104
27104
28104
29104
30104
31104

How January really feels in Nagasu

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.

Nagasu 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 daysDaylight (hours)Travel score
Jan11° / 628.110.12.6
Feb12° / 828.810.83.0
Mar15° / 12811.711.74.4
Apr20° / 12°14510.912.86.0
May24° / 16°17211.113.76.6
Jun26° / 20°39316.714.15.3
Jul30° / 24°33016.7144.3
Aug31° / 25°15912.713.24.2
Sep28° / 22°16510.812.25.8
Oct24° / 16°1017.411.27.4
Nov18° / 11°907.810.36.1
Dec13° / 727.79.93.7

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% 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 (%)
14258
24258
34258
44159
54159
64060
74060
83961
93862
103763
113664
123664
133664
143466
153466
163367
173367
183367
193367
203367
213268
223268
233268
243268
253268
263367
273367
283367
293565
303664
313664

Chance of precipitation in January

Any precipitation

Nagasu gets around 62 mm of rain and snow over 8.1 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 30% on the wettest days, and about 0 day brings snow. The odds climb toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
122
222
322
422
522
622
723
823
923
1024
1124
1225
1325
1426
1527
1627
1728
1828
1929
2029
2129
2229
2330
2430
2530
2629
2729
2829
2929
3028
3128

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 10 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
110calm
210calm
310calm
410calm
510calm
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 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 7:26 AM to 7:20 AM, and sunset from 5:17 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.97:265:17
29.97:265:18
39.97:265:19
49.97:265:19
59.97:265:20
69.97:265:21
79.97:265:22
89.97:275:22
99.97:275:23
1010.07:275:24
1110.07:275:25
1210.07:265:26
1310.07:265:26
1410.07:265:27
1510.07:265:28
1610.07:265:29
1710.17:265:30
1810.17:265:31
1910.17:255:32
2010.17:255:33
2110.17:255:33
2210.27:255:34
2310.27:245:35
2410.27:245:36
2510.27:235:37
2610.37:235:38
2710.37:235:39
2810.37:225:40
2910.37:225:41
3010.37:215:42
3110.47:205:43

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.38 kWh/m².

For context, solar energy here swings from a low near 2.22 kWh/m² to a high of 5.2 kWh/m² in May across the year — January's 2.38 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
172.3Moderate
182.3Moderate
192.4Moderate
202.4Moderate
212.4Moderate
222.4Moderate
232.5Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.7Moderate
312.7Moderate
Planning a trip in January

Hazard calendar for Nagasu

In seasonPeak

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

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

Nagasu's rainy season runs June–July, 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 Nagasu?

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

2.6
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 Nagasu.

What to pack for Nagasu in January

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

In January, Nagasu sees daytime highs around 11°C and nights near 4°C. Pack a warm layer. Worth having: rain gear. About 8 days see rain.

a warm layerrain gear

Sea temperature near Nagasu in January

The nearest coast averages about 15°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 27 to Nov 14 — about 5.7 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr16Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Cool
Dec17Cool

UV index in Nagasu 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 Nagasu peaks around July 13 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 13UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Nagasu 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 Nagasu is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (July, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2325 µg/m³Jul 2114 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb20Moderate
Mar25Moderate
Apr25Moderate
May23Moderate
Jun19Moderate
Jul13Moderate
Aug15Moderate
Sep14Moderate
Oct14Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Nagasu?

Nagasu sits at 32.9°N, 130.4°E, 8 m above sea level, in Japan. The nearest listed city is Arao, 5.0 km away.

Topography around Nagasu

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

Within 3 km, the terrain around Nagasu has only modest variations in elevation — a maximum elevation change of 46 m around an average of 4 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 501 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,765 m.

The land around Nagasu is covered by water (49%) and artificial surfaces (21%) within 3 km, water (57%) within 16 km, and trees (57%) and water (25%) within 80 km.

3 km
46 m
16 km
501 m
80 km
1,765 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Arao 5.0 km · Ōmuta 11 km · Tamana 12 km · Shimabara 18 km · Miyama 22 km · Uekimachi-mōno 23 km · Setakamachi-takayanagi 24 km · Yamaga 25 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 Nagasu (32.9326°, 130.4428°, elevation 8 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).