Nagasu weather in December

In December, Nagasu sees average daytime highs of 13°C and overnight lows near 6°C, with 72 mm of precipitation across 7.7 wet days and about 9.9 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 15°C in the first days to 11°C by the end. The sky is clear or mostly clear about 26% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 hours at the start of December to 9 h 54 min by month's end. Set against the rest of the year, December is Nagasu's 4th-clearest and 4th-windiest month. For the whole year in context, see Nagasu's year-round climate.

Daytime high
13°
10th warmest
Overnight low
3rd coldest
Precipitation
72 mm
7.7 wet days
Daylight
9 h 48 min
7:19 AM – 5:10 PM
Cloud cover
59%
4th clearest
Wind
10 km/h
4th windiest
Solar energy
2.22 kWh/m²
Travel score
3.7
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 December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 15°C in the first days to 11°C by the end.

A typical December day in Nagasu reaches about 13°C in the afternoon and slips back to 6°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 17°C. Set against its neighbours, December runs about 5°C cooler than November and about 2°C warmer than January.

10°15°20°151015202531
Avg high (°C)Avg low (°C)
1158
2158
3158
4148
5148
6147
7147
8147
9147
10137
11137
12137
13136
14136
15136
16136
17126
18126
19126
20126
21126
22126
23125
24125
25125
26125
27125
28125
29125
30115
31115

How December really feels in Nagasu

Once humidity and wind are folded in, December 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

December 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 December compares with the rest of the year at a glance. December is the 10th-warmest and 11th-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 December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 19% of December, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35149
45149
55050
64951
74951
84852
94753
104654
114753
124654
134555
144555
154456
164456
174357
184357
194357
204258
214258
224357
234258
244258
254357
264258
274258
284258
294258
304258
314258

Chance of precipitation in December

Any precipitation

Nagasu gets around 72 mm of rain and snow over 7.7 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 25% and peaks near 28% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)
128
228
328
428
528
627
727
827
926
1026
1125
1225
1325
1424
1524
1624
1723
1823
1923
2023
2123
2223
2323
2423
2523
2623
2723
2822
2922
3022
3122

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19541
29631
39631
49631
59631
69721
79721
89820
99820
109820
119820
129910
139910
149910
159910
169910
179910
189910
199910
209910
219910
229910
239910
249910
259910
2610000
2710000
2810000
2910000
3010000
3110000

Wind in December

Winds average 10 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 hours at the start of December to 9 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:08 AM to 7:26 AM, and sunset from 5:08 PM to 5:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.07:085:08
210.07:095:07
310.07:105:07
49.97:115:07
59.97:125:07
69.97:125:08
79.97:135:08
89.97:145:08
99.97:155:08
109.97:155:08
119.97:165:08
129.97:175:08
139.97:175:09
149.87:185:09
159.87:195:09
169.87:195:10
179.87:205:10
189.87:205:10
199.87:215:11
209.87:215:11
219.87:225:11
229.87:225:12
239.87:235:12
249.87:235:13
259.87:245:13
269.87:245:14
279.87:255:15
289.87:255:15
299.87:255:16
309.87:255:16
319.97:265:17

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.22 kWh/m² — the year's lowest.

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 — December's 2.22 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.4Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.3Moderate
62.3Moderate
72.3Moderate
82.2Moderate
92.2Moderate
102.2Moderate
112.2Moderate
122.2Moderate
132.2Moderate
142.2Moderate
152.2Moderate
162.2Moderate
172.2Moderate
182.2Moderate
192.2Moderate
202.2Moderate
212.2Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.2Moderate
262.3Moderate
272.3Moderate
282.3Moderate
292.3Moderate
302.3Moderate
312.3Moderate
Planning a trip in December

Hazard calendar for Nagasu

In seasonPeak

In December, 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 December a good time to visit Nagasu?

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

3.7
Sightseeing
10th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Nagasu.

What to pack for Nagasu in December

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

In December, Nagasu sees daytime highs around 13°C and nights near 6°C. Worth packing: a warm layer. About 8 days see rain.

a warm layer

Sea temperature near Nagasu in December

The nearest coast averages about 17°C in December — 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 December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. 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 December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December 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
December 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).