Hiroshima, Japan
Hiroshima on one page: facts, climate by month, daylight and public holidays, each with its source.
- Population: 1,166,679 (Hiroshima City, 1 October 2026, estimate)
- Warmest month: August, daily high 32.8 °C (91.0 °F), 1991-2020
- Coldest month: January, daily low 2.0 °C (35.6 °F), 1991-2020
- Wettest month: July, rain 279.8 mm (11.02 in), 1991-2020
- Most daylight: June, 14 h 27 min (15th of each month, 2026)
Warmest, coldest, wettest, most daylight: the highest or lowest of the 12 monthly values. Figures in brackets are converted: °F = °C × 9 ÷ 5 + 32, to 1 decimal; inches = mm ÷ 25.4, to 2 decimals.
Last updated : city answers rechecked against their sources.
What makes Hiroshima special
- What does the name Hiroshima mean?
- It means wide island. Long ago, a strong lord named Mori Terumoto set up the town on the flat land where the Ota River meets the sea. A castle soon rose there, and he moved in. Source: Wikipedia, checked .
- Why are there piles of paper cranes in the peace park?
- They honor Sadako, a young girl who fell ill from the bomb and died. Before she passed, she dreamed of folding a thousand cranes. An old saying grants a wish for that many. People still fold cranes and leave them by her statue. Source: Wikipedia, checked .
- Why is Hiroshima Castle called Carp Castle?
- There are a few stories. The area was once called Koi no ura, and the place name Koi may once have been written as carp. Some say the moat was full of carp. Others point to the black keep. Source: Wikipedia (Japanese), checked .
- How did a cheap pancake help Hiroshima after the bomb?
- Before the war, a thin pancake topped with green onions was a hit here. After the bomb, it gave survivors a cheap meal. The usual fillings were hard to get, so cooks used what they had. It became okonomiyaki, cooked how you like it. Source: Wikipedia, checked .
- How soon did Hiroshima's trams run again after the bomb?
- The bomb wrecked or hurt nearly all of the city's trams. Yet within days, trams ran again. A few trams from that time still carry riders. The trams come from all over Japan and Europe, so the network has a nickname: the Moving Streetcar Museum. Source: Wikipedia, checked .
- Why is the oleander the flower of Hiroshima?
- Some trees lived through the bomb. People call them survivor trees. A willow on the Ota River bank fell, but new buds grew from its roots. The oleander was made the city's flower for being so full of life. Source: Wikipedia, checked .
Facts
| Fact | Value and source |
|---|---|
| Country | Japan Source: GeoNames dump, checked |
| Population | 1,166,679 (Hiroshima City, 1 October 2026, estimate) Source: Hiroshima City, checked |
| Area | 906.69 km² (Hiroshima City, 1 October 2025) Source: Hiroshima City, checked |
| Coordinates | 34.3853° N, 132.4553° E rounded to four decimal places Source: Wikidata Query Service, checked |
| Time zone | Asia/ |
| Languages | Japanese (de facto) Japanese is the language of the courts by law (Court Act, art. 74). Source: Court Act, art. 74, checked |
| Currency | Yen (JPY) list dated 17 September 2026 Source: ISO 4217 list one (SIX Group), checked |
Climate by month
| Month | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|
| Jan | 9.9 | 2.0 | 46.2 | 138.6 |
| Feb | 10.9 | 2.4 | 64.0 | 140.1 |
| Mar | 14.5 | 5.1 | 118.3 | 176.7 |
| Apr | 19.8 | 10.1 | 141.0 | 191.9 |
| May | 24.4 | 15.1 | 169.8 | 210.8 |
| Jun | 27.2 | 19.8 | 226.5 | 154.6 |
| Jul | 30.9 | 24.1 | 279.8 | 173.4 |
| Aug | 32.8 | 25.1 | 131.4 | 207.3 |
| Sep | 29.1 | 21.1 | 162.7 | 167.3 |
| Oct | 23.7 | 14.9 | 109.2 | 178.6 |
| Nov | 17.7 | 8.9 | 69.3 | 153.3 |
| Dec | 12.1 | 4.0 | 54.0 | 140.6 |
Climate normals 1991-2020, computed by JMA and submitted to the World Meteorological Organization. Checked .
High: mean daily maximum temperature. Low: mean daily minimum temperature. Rain: mean monthly precipitation total. Sunshine: mean monthly sunshine duration.
Daylight by month
| Month | Sunrise | Sunset | Day length |
|---|---|---|---|
| Jan | 07:16 | 17:23 | 10 h 06 min |
| Feb | 06:56 | 17:53 | 10 h 57 min |
| Mar | 06:21 | 18:17 | 11 h 56 min |
| Apr | 05:40 | 18:42 | 13 h 02 min |
| May | 05:08 | 19:05 | 13 h 57 min |
| Jun | 04:57 | 19:24 | 14 h 27 min |
| Jul | 05:09 | 19:23 | 14 h 14 min |
| Aug | 05:31 | 18:58 | 13 h 27 min |
| Sep | 05:53 | 18:18 | 12 h 25 min |
| Oct | 06:15 | 17:36 | 11 h 21 min |
| Nov | 06:43 | 17:06 | 10 h 23 min |
| Dec | 07:09 | 17:01 | 9 h 53 min |
Sunrise and sunset computed to the minute. Day length in hours and minutes. How we compute daylight
Source: NOAA Solar Calculator equations, checked .
Airports
| IATA code | Airport | Type | Distance, km |
|---|---|---|---|
| HIJ | Hiroshima Airport | large airport | 43 |
| IWK | Iwakuni Kintaikyo Airport | medium airport | 33 |
Source: OurAirports airports.csv, checked .
Public holidays
| Date | Holiday | Scope |
|---|---|---|
| Thursday | New Year's Day | national |
| Monday | Coming of Age Day | national |
| Wednesday | Foundation Day | national |
| Monday | Emperor's Birthday | national |
| Friday | Vernal Equinox Day | national |
| Wednesday | Showa Day | national |
| Sunday | Constitution Day | national |
| Monday | Greenery Day | national |
| Tuesday | Children's Day | national |
| Wednesday | Substitute Holiday | national |
| Monday | Marine Day | national |
| Tuesday | Mountain Day | national |
| Monday | Respect for the Aged Day | national |
| Tuesday | National Holiday | national |
| Wednesday | Autumnal Equinox Day | national |
| Monday | Sports Day | national |
| Tuesday | Culture Day | national |
| Monday | Labor Thanksgiving Day | national |
| Date | Holiday | Scope |
|---|---|---|
| Friday | New Year's Day | national |
| Monday | Coming of Age Day | national |
| Thursday | Foundation Day | national |
| Tuesday | Emperor's Birthday | national |
| Sunday | Vernal Equinox Day | national |
| Monday | Substitute Holiday | national |
| Thursday | Showa Day | national |
| Monday | Constitution Day | national |
| Tuesday | Greenery Day | national |
| Wednesday | Children's Day | national |
| Monday | Marine Day | national |
| Wednesday | Mountain Day | national |
| Monday | Respect for the Aged Day | national |
| Thursday | Autumnal Equinox Day | national |
| Monday | Sports Day | national |
| Wednesday | Culture Day | national |
| Tuesday | Labor Thanksgiving Day | national |
Checked against the official list, .
Source: holidays Python library, checked . Library: holidays 0.105.
Landmarks
| Place | Kind | Lasting fact and source |
|---|---|---|
| Hiroshima Peace Memorial (Genbaku Dome) | World Heritage site | UNESCO entry |
| Hiroshima Castle | historic site or monument | Heritage-listed since 1953, own site |
| Hiroshima Peace Memorial Museum | museum | Opened 1955, own site |
| Shukkei-en | park or garden | Founded 1620, own site |
| Hiroshima Museum of Art | museum | Opened 1978, own site |
| Hiroshima National Peace Memorial Hall for the Atomic Bomb Victims | historic site or monument | Opened 2002, own site |
| Hiroshima Prefectural Art Museum | museum | Opened 1968, own site |
Sources: as named in each row, checked . How we choose landmarks
Other cities
In Japan
Closest climate
Among the 20 cities with month pages, these have the monthly highs and lows nearest to Hiroshima's, averaged over the year. How we compare climates
Sources
- Wikidata Query Service, Wikimedia Foundation. Attribution: Wikidata. Licence: CC0 1.0. Checked .
- GeoNames dump (cities15000, countryInfo), GeoNames. Attribution: GeoNames, https://www.geonames.org/. Licence: CC BY 4.0. Checked .
- OurAirports airports.csv, OurAirports (David Megginson). Attribution: OurAirports. Licence: Public domain. Checked .
- WMO Climatological Standard Normals for 1991-2020 (NCEI Accession 0253808), WMO Member Nations (each national weather service's own submission); archived by NOAA National Centers for Environmental Information. Attribution: WMO Member Nations (2023). WMO Climatological Standard Normals for 1991-2020 (NCEI Accession 0253808). Station files named in each record. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/800j-vn07. Accessed on the check date shown. Licence: No licence stated. Published by NOAA NCEI for WMO; citation requested. Checked .
- NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked .
- IANA Time Zone Database, read through the PyPI tzdata package, IANA. Attribution: IANA Time Zone Database. Licence: Public-domain data. Checked .
- holidays Python library, run locally, Vacanza team. Attribution: holidays library, Vacanza team. Licence: MIT. Checked .
Official sources
Cite this page: City by Month. "Hiroshima, Japan: facts and climate by month". https://citybymonth.com/cities/japan/hiroshima/. Last updated 5 November 2026.