Hiroshima weather in December

In December, Hiroshima sees average daytime highs of 10°C and overnight lows near 2°C, with 64 mm of precipitation across 9.6 wet days and about 9.7 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 12°C in the first days to 9°C by the end. The sky is clear or mostly clear about 22% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of December to 9 h 42 min by month's end. Set against the rest of the year, December is Hiroshima's 3rd-clearest and 4th-windiest month. For the whole year in context, see Hiroshima's year-round climate.

Daytime high
10°
10th warmest
Overnight low
3rd coldest
Precipitation
64 mm
9.6 wet days
Daylight
9 h 42 min
7:15 AM – 4:58 PM
Cloud cover
58%
3rd clearest
Wind
9 km/h
4th windiest
Solar energy
2.18 kWh/m²
Travel score
2.4
out of 10

Hiroshima is capital city of Hiroshima Prefecture, Japan.

Air quality
Moderate
PM2.5 11 µg/m³ · 2010
Density
1,327/km²
people per km²
Founded
1889

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 12°C in the first days to 9°C by the end.

A typical December day in Hiroshima reaches about 10°C in the afternoon and slips back to 2°C overnight — a 8°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, December runs about 6°C cooler than November and about 2°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1134
2124
3124
4124
5123
6113
7113
8113
9113
10113
11113
12103
13102
14102
15102
16102
17102
18102
19102
2092
2192
2292
2392
2491
2591
2691
2791
2891
2991
3091
3191

How December really feels in Hiroshima

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 20 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
20
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Hiroshima 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
Jan / 559.45.3101.2
Feb / 669.7410.71.7
Mar13° / 11011.71.711.73.4
Apr18° / 12410.30.112.85.7
May23° / 13°14310.3013.86.6
Jun25° / 18°21514.3014.35.7
Jul29° / 22°25116.1014.14.6
Aug30° / 23°15714013.34.3
Sep27° / 19°18812.6012.25.9
Oct22° / 13°1098.3011.16.9
Nov16° / 718.10.110.25.1
Dec10° / 649.62.99.72.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 29% of December, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35347
45248
55248
65248
75149
85149
95050
105050
114951
125050
134951
145050
154951
164951
174951
184951
195050
205050
215050
225050
235050
245050
255149
265149
275149
285149
295149
305149
315149

Chance of precipitation in December

Any precipitationSnow

Hiroshima gets around 64 mm of rain and snow over 9.6 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 30% and peaks near 31% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1303
2304
3304
4315
5315
6315
7316
8316
9316
10317
11307
12307
13308
14308
15308
16309
17309
18309
193010
203010
213011
223012
233012
243012
253013
263013
273013
283013
292914
302914
312914

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 54 min at the start of December to 9 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:04 AM to 7:21 AM, and sunset from 4:56 PM to 5:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.97:044:56
29.97:054:56
39.87:064:56
49.87:064:56
59.87:074:56
69.87:084:56
79.87:094:56
89.87:104:56
99.87:104:56
109.87:114:56
119.77:124:56
129.77:124:57
139.77:134:57
149.77:144:57
159.77:144:57
169.77:154:58
179.77:164:58
189.77:164:58
199.77:174:59
209.77:174:59
219.77:185:00
229.77:185:00
239.77:195:01
249.77:195:01
259.77:205:02
269.77:205:02
279.77:205:03
289.77:215:03
299.77:215:04
309.77:215:05
319.77:215:05

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.18 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.18 kWh/m² to a high of 5.59 kWh/m² in May across the year — December's 2.18 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.3Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.2Moderate
62.2Moderate
72.2Moderate
82.2Moderate
92.2Moderate
102.2Moderate
112.2Moderate
122.2Moderate
132.1Moderate
142.1Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.1Moderate
192.1Moderate
202.2Moderate
212.2Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.2Moderate
262.2Moderate
272.2Moderate
282.2Moderate
292.3Moderate
302.3Moderate
312.3Moderate
Planning a trip in December

Hazard calendar for Hiroshima

In seasonPeak

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

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

Hiroshima's rainy season runs April–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 December a good time to visit Hiroshima?

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

2.4
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 Hiroshima.

What to pack for Hiroshima in December

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

In December, Hiroshima sees daytime highs around 10°C and nights near 2°C. Pack a warm layer. Worth having: rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Hiroshima 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 at the nearest coast (about 31 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 13 to Nov 17 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun20Refreshing
Jul24Warm
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov20Refreshing
Dec17Cool

UV index in Hiroshima 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 Hiroshima peaks around July 13 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJul 13UV 10Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Hiroshima 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 Hiroshima is worst in April — around 16 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 8 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Hiroshima's WHO annual average of 11 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1316 µg/m³Oct 178 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar15Moderate
Apr16Moderate
May14Moderate
Jun13Moderate
Jul10Good
Aug10Good
Sep9Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Hiroshima?

Hiroshima sits at 34.4°N, 132.4°E, 16 m above sea level, in Japan. The nearest listed city is Gion, 4.0 km away.

Topography around Hiroshima

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

Within 3 km, the terrain around Hiroshima has significant variations in elevation — a maximum elevation change of 342 m around an average of 30 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 978 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,327 m.

The land around Hiroshima is covered by artificial surfaces (68%) within 3 km, trees (54%) and artificial surfaces (24%) within 16 km, and trees (64%) and water (29%) within 80 km.

3 km
342 m
16 km
978 m
80 km
1,327 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Gion 4.0 km · Fuchū 6.0 km · Kaitaichi 8.0 km · Hatsukaichi 12 km · Kumano 13 km · Miyajima 16 km · Etajima 18 km · Ōno-hara 21 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 Hiroshima (34.4°, 132.45°, elevation 16 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).