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Hiroshima weather

Hiroshima · 1,200,754 inhabitants · Friday, October 30 · updated 03:02

Raining now Air: Good Low storm risk · Today

18°

Rain

Feels like 18°C

Wind

13 km/h

Gusts

28 km/h

Humidity

87 %

Pressure

1019 hPa

Clouds

77 %

Storm

Rise 06:28 Set 17:19 Day 10 h 51 min UV 4 · Moderate

Morning, afternoon, evening

Trend

Night

Rain

19°18°

Feels like 19°

Wind ↑ SSW 32 km/h

Gusts 41 km/h

Humidity 85 %

💧 17.0 mm

Morning

Rain

19°18°

Feels like 19°

Wind ↑ SSW 24 km/h

Gusts 39 km/h

Humidity 85 %

💧 8.7 mm

⚡ storm

Afternoon

Rain showers

20°19°

Feels like 20°

Wind ↑ SW 27 km/h

Gusts 39 km/h

Humidity 82 %

💧 1.8 mm

Evening

Clear sky

19°17°

Feels like 19°

Wind ↑ W 22 km/h

Humidity 71 %

💧 0.2 mm

09:00

18°

6.9mm

SSW 10

12:00

19°

0.7mm

SW 27

15:00

20°

1.1mm

SW 15

18:00

19°

0.1mm

W 22

21:00

17°

0.1mm

WNW 10

00:00

17°

W 13

03:00

15°

0.1mm

WNW 8

06:00

16°

WNW 10

Hiroshima forecast in charts · next 7 days

The week ahead: highs and lows

≈ A week close to the usual temperatures

Highs Lows Usual for the season (1991–2020 average)

Hourly detail

Temperature (°C) Rain (mm) Wind (km/h)

Hiroshima climate: what a normal year looks like

The hottest stretch is August, when afternoons average 30 °C; the coldest is January, when nights average 2 °C. Between those two months the average temperature changes by 22 °C.

A normal year brings roughly 1,600 mm of rain — more than 79% of the towns of 20,000+ people we compared it with.

From 14 h 27 min of daylight in late June to 9 h 51 min in late December.

Afternoons climb to 25 °C only from July to September, with a typical peak of 30 °C in August.

Forecast highs for the coming week average 19 °C, 3 °C cooler than a normal October (22 °C).

30-year averages (1991–2020)
Month	Typical high	Typical low	Rainfall
Jan	8 °C	3 °C	61 mm
Feb	9 °C	3 °C	76 mm
Mar	12 °C	5 °C	118 mm
Apr	17 °C	10 °C	136 mm
May	21 °C	15 °C	151 mm
Jun	24 °C	19 °C	234 mm
Jul	28 °C	23 °C	240 mm
Aug	30 °C	24 °C	150 mm
Sep	27 °C	21 °C	182 mm
Oct	22 °C	15 °C	114 mm
Nov	17 °C	10 °C	73 mm
Dec	11 °C	5 °C	68 mm
Whole year	19 °C	13 °C	1,600 mm

Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 34.35° N, 132.46° E, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.

Air you breathe in Hiroshima: pollution and pollen

1/6

Good

European Air Quality Index (EAQI), from Copernicus CAMS

PM2.510µg/m³

PM1012µg/m³

Copernicus CAMS model, updated several times a day.

Rain radar around Hiroshima

Rain observed over the last two hours by official weather radars around Hiroshima, followed by the radar forecast for the next hour where the weather service provides one.

Full-screen rain radar and next-hour rain on RainAtlas

Rain radar Last two hours, then forecast where available · drag the timeline

No open weather radar covers Hiroshima yet: the map shows our hour-by-hour rain forecast (ICON, GFS).

Moon over Hiroshima

Waning gibbous

79 % illuminated · 19.3 days

Rise 15:33 Set 05:54

Sat 31/10 69%

Sun 1/11 59%

Mon 2/11 49% Last quarter

Tue 3/11 38%

Wed 4/11 28%

Thu 5/11 19%

Fri 6/11 12%

Sat 7/11 6%

Sun 8/11 2%

Mon 9/11 0%

Tue 10/11 1% New moon

Wed 11/11 3%

Moonrise and moonset in local time (Asia/Tokyo); phase and lit fraction from a synodic calculation.

Look up a past day in Hiroshima

Curious about the weather in Hiroshima on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.

Hiroshima weather at a glance

This page gathers everything about the weather in Hiroshima, Hiroshima: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “rain”, it is 18 °C (feels like 18 °C) and the wind blows at 13 km/h.

Expected range today: 15 °C to 20 °C and around 9 mm of rain; keep an eye on thunderstorms. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms.

Other big cities nearby

Hiroshima weather data for developers

Use the Hiroshima forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.

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Where does this forecast come from? Our engine, checked every day against 1125 weather stations