Nagasaki weather in December

In December, Nagasaki sees average daytime highs of 12°C and overnight lows near 9°C, with 92 mm of rain across 10.3 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 14°C in the first days to 11°C by the end. The sky is clear or mostly clear about 25% 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 Nagasaki's 7th-clearest and 2nd-windiest month. For the whole year in context, see Nagasaki's year-round climate.

Daytime high
12°
10th warmest
Overnight low
3rd coldest
Rainfall
92 mm
10.3 wet days
Daylight
9 h 54 min
7:21 AM – 5:12 PM
Cloud cover
61%
7th clearest
Wind
18 km/h
2nd windiest
Solar energy
2.17 kWh/m²
Travel score
3.3
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 14°C in the first days to 11°C by the end.

A typical December day in Nagasaki reaches about 12°C in the afternoon and slips back to 9°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 16°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)
11411
21411
31410
41410
51410
61310
71310
81310
9139
10139
11139
12139
13129
14129
15129
16129
17128
18128
19128
20128
21128
22118
23118
24118
25118
26118
27118
28118
29117
30117
31117

How December really feels in Nagasaki

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.

Nagasaki 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 daysSnow daysDaylight (hours)Travel score
Jan10° / 8010.80.610.12.1
Feb11° / 97100.410.82.5
Mar13° / 14912011.83.7
Apr17° / 13°16711.4012.85.3
May21° / 17°19710.8013.76.2
Jun24° / 21°44416.5014.15.5
Jul27° / 24°34616.6013.95.3
Aug29° / 25°18513.7013.25.2
Sep26° / 23°20211.9012.26.4
Oct22° / 18°1127.5011.27.3
Nov17° / 13°1069.1010.35.7
Dec12° / 9210.309.93.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% 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 56%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25248
35149
45149
54951
64852
74753
84852
94753
104654
114555
124654
134456
144456
154357
164258
174159
184258
194159
204159
214060
224060
234159
244159
254159
264060
274060
284060
294060
303961
313961

Chance of precipitation in December

Any precipitation

Nagasaki gets around 92 mm of rain over 10.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
133
233
334
434
534
634
734
833
933
1033
1133
1233
1332
1432
1532
1632
1732
1832
1932
2032
2132
2232
2333
2433
2533
2633
2733
2833
2934
3034
3134

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 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19352
29352
39541
49541
59541
69631
79631
89631
99631
109631
119730
129730
139820
149820
159820
169820
179820
189820
199820
209820
219910
229910
239910
249910
259910
269910
279910
289910
299910
309910
319910

Wind in December

Winds average 18 km/h in December.

Across December, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze
3118light breeze

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 7:10 AM to 7:28 AM, and sunset from 5:10 PM to 5:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.07:105:10
210.07:115:10
310.07:125:10
410.07:135:10
59.97:135:10
69.97:145:10
79.97:155:10
89.97:165:10
99.97:165:11
109.97:175:11
119.97:185:11
129.97:185:11
139.97:195:11
149.97:205:12
159.97:205:12
169.97:215:12
179.97:225:13
189.87:225:13
199.87:235:13
209.87:235:14
219.87:245:14
229.87:245:15
239.87:255:15
249.87:255:16
259.87:265:16
269.87:265:17
279.97:265:17
289.97:275:18
299.97:275:18
309.97:275:19
319.97:285:20

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.17 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.17 kWh/m² to a high of 5.36 kWh/m² in May across the year — December's 2.17 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.3Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.3Moderate
62.2Moderate
72.2Moderate
82.2Moderate
92.2Moderate
102.2Moderate
112.2Moderate
122.2Moderate
132.2Moderate
142.1Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.1Moderate
192.1Moderate
202.1Moderate
212.1Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.2Moderate
262.2Moderate
272.2Moderate
282.2Moderate
292.2Moderate
302.2Moderate
312.2Moderate
Planning a trip in December

Hazard calendar for Nagasaki

In seasonPeak

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

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

Nagasaki'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 Nagasaki?

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

3.3
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 Nagasaki.

What to pack for Nagasaki in December

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

In December, Nagasaki sees daytime highs around 12°C and nights near 9°C. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Nagasaki in December

The nearest coast averages about 19°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 14 km away) is warmest in August at about 28°C and coldest in February near 16°C.

It's comfortable for a long swim from May 21 to Dec 1 — about 6.4 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan17Cool
Feb16Cool
Mar16Cool
Apr17Cool
May20Cool
Jun22Refreshing
Jul25Warm
Aug28Warm
Sep27Warm
Oct24Warm
Nov21Refreshing
Dec19Cool

UV index in Nagasaki 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 Nagasaki 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 Nagasaki 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 Nagasaki 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 Nagasaki?

Nagasaki sits at 32.8°N, 129.9°E, 15 m above sea level, in Japan. The nearest listed city is Obita, 7.0 km away.

Topography around Nagasaki

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

Within 3 km, the terrain around Nagasaki has significant variations in elevation — a maximum elevation change of 418 m around an average of 122 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 587 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,455 m.

The land around Nagasaki is covered by trees (51%) and artificial surfaces (41%) within 3 km, water (51%) and trees (38%) within 16 km, and water (60%) and trees (29%) within 80 km.

3 km
418 m
16 km
587 m
80 km
1,455 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Obita 7.0 km · Togitsu 10 km · Isahaya 18 km · Ōmura 20 km · Saikai 32 km · Unzen 34 km · Minamishimabara 37 km · Hondomachi-hondo 42 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 Nagasaki (32.75°, 129.8833°, elevation 15 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).