Hiroshima weather in January

In January, Hiroshima sees average daytime highs of 8°C and overnight lows near 0°C, with 55 mm of precipitation across 9.4 wet days and about 10 hours of daylight. It is the 12th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 8°C through the month. The sky is clear or mostly clear about 14% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 42 min at the start of January to 10 h 18 min by month's end. Set against the rest of the year, January is Hiroshima's 9th-clearest and 1st-windiest month. For the whole year in context, see Hiroshima's year-round climate.

Daytime high
12th warmest
Overnight low
1st coldest
Precipitation
55 mm
9.4 wet days
Daylight
9 h 54 min
7:21 AM – 5:18 PM
Cloud cover
64%
9th clearest
Wind
9 km/h
1st windiest
Solar energy
2.44 kWh/m²
Travel score
1.2
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 January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 8°C through the month.

A typical January day in Hiroshima reaches about 8°C in the afternoon and slips back to 0°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 4°C and 11°C. Set against its neighbours, January runs about 2°C cooler than December and about 1°C cooler than February.

-5°10°15°151015202531
Avg high (°C)Avg low (°C)
181
281
381
481
581
681
781
880
980
1080
1180
1280
1380
1480
1580
1680
1780
1870
1970
2070
2170
2270
2370
2470
2570
2670
2770
2870
2970
3070
3170

How January really feels in Hiroshima

Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 31 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
31
wind chill below the day's low

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

Hiroshima 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 / 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 January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 31% of January, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25149
35149
45149
55050
65050
75050
84951
94951
104951
114753
124654
134654
144555
154456
164456
174258
184258
194258
204159
214159
224060
234060
244060
254060
264060
274060
284060
294159
304258
314159

Chance of precipitation in January

Any precipitationSnow

Hiroshima gets around 55 mm of rain and snow over 9.4 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 31% and peaks near 34% on the wettest days, and about 5 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12814
22814
32814
42814
52814
62714
72714
82815
92815
102815
112915
122916
133016
143116
153117
163217
173318
183319
193419
203419
213420
223420
233420
243420
253420
263420
273420
283420
293320
303319
313319

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 9 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 9 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
19calm
29calm
39calm
49calm
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 January

DaylightNight

Daylight runs from about 9 h 42 min at the start of January to 10 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over January. Sunrise moves from 7:21 AM to 7:15 AM, and sunset from 5:05 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.77:215:05
29.77:215:06
39.87:225:07
49.87:225:08
59.87:225:08
69.87:225:09
79.87:225:10
89.87:225:11
99.87:225:12
109.87:225:12
119.97:225:13
129.97:225:14
139.97:225:15
149.97:225:16
159.97:225:17
169.97:215:18
1710.07:215:18
1810.07:215:19
1910.07:215:20
2010.07:205:21
2110.07:205:22
2210.17:205:23
2310.17:195:24
2410.17:195:25
2510.17:185:26
2610.17:185:27
2710.27:185:28
2810.27:175:29
2910.27:165:30
3010.27:165:31
3110.37:155:32

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.44 kWh/m².

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 — January's 2.44 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
122.4Moderate
132.4Moderate
142.4Moderate
152.4Moderate
162.4Moderate
172.4Moderate
182.4Moderate
192.5Moderate
202.5Moderate
212.5Moderate
222.5Moderate
232.5Moderate
242.6Moderate
252.6Moderate
262.6Moderate
272.6Moderate
282.7Moderate
292.7Moderate
302.7Moderate
312.8Moderate
Planning a trip in January

Hazard calendar for Hiroshima

In seasonPeak

In January, 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 January a good time to visit Hiroshima?

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

1.2
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 Hiroshima.

What to pack for Hiroshima in January

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

In January, Hiroshima sees daytime highs around 8°C and nights near 0°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 9 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Hiroshima 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 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 January

LowModerateHighVery highExtreme

Clear-sky midday UV in January 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 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 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
January 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).