Hiroshima in August
In August, Hiroshima has 131.4 mm (5.17 in) of rain, a daily high of 32.8 °C (91.0 °F) and a daily low of 25.1 °C (77.2 °F), as 1991-2020 means; figures in brackets are converted.
Last updated : what the month is like; shorter source notes.
Best time to visit Hiroshima: August misses our rule: days are 4.8 °C over our 28 °C. Expect 7.6 rain days and days that shorten by 56 min.
What August is like in Hiroshima
- Every 6 August at quarter past eight, when the bomb fell, the Peace Bell and sirens sound. At the ceremony, at home and at work, people pray in silence for a minute. Source: City of Hiroshima, checked .
- As night falls on 6 August every year, thousands of paper lanterns in wooden frames float on the Motoyasu River below the Atomic Bomb Dome. A flame burns inside each one. Source: Cabinet Office, Government of Japan (Highlighting Japan), checked .
- Candles light up seven shrines and temples near the Shinkansen exit of Hiroshima Station at dusk on 5 August, the day before the bomb anniversary. Each one offers prayers for peace. Source: Hiroshima Toshogu, checked .
Key figures
Weather in August, 1991-2020 means
- Daily high
- 32.8 °C (91.0 °F)
- Daily low
- 25.1 °C (77.2 °F)
- Rain
- 131.4 mm (5.17 in) in the month
- Sunshine
- 207.3 h in the month
Climate normals 1991-2020, computed by JMA and submitted to the World Meteorological Organization. Checked .
Station: Hiroshima, 1.6 km from the city centre point.
In August the sea off Hiroshima averages 26.3 °C (79.3 °F), 2.1 °C warmer than in July.
Our 1991-2020 mean of NOAA OISST v2.1, checked .
Daylight on 15 August 2026
- Sunrise
- 05:31 local time
- Sunset
- 18:58 local time
- Day length
- 13 h 27 min
Day length 1-31 August: 13 h 52 min to 12 h 56 min, -56 min.
Source: NOAA Solar Calculator equations, checked .
Month by month
Each month: daily high in °C, then rain in mm, 1991-2020 means.
WMO climate normals 1991-2020, as above, checked .
This month against the year
| Measure | August | Rank |
|---|---|---|
| Daily high | 32.8 °C | warmest |
| Daily low | 25.1 °C | warmest |
| Rain | 131.4 mm | 6th wettest |
| Sunshine | 207.3 hours | 2nd sunniest |
| Day length | 13 h 27 min | 4th longest |
Equal values share a rank. How we rank months
Sunshine share: 50% of the 415.9 hours from sunrise to sunset in August. How we compute sunshine share
Hiroshima in August, on average: 7.6 rain days (1 mm or more).
WMO climate normals 1991-2020, as above, checked .
Day length: NOAA solar equations, checked .
Public holidays this month
| Date | Holiday | Scope |
|---|---|---|
| Tuesday | Mountain Day | national |
| Date | Holiday | Scope |
|---|---|---|
| Wednesday | Mountain Day | national |
Checked against the official list, .
Source: holidays Python library, checked . Library: holidays 0.105.
Same month in 20 cities
Hiroshima is warmer than 17 of our 20 cities in August by mean daily high. How we rank cities
Closest high and low in August: Osaka (0.8 °C apart, equal), Singapore (0.8, equal), Hong Kong (1.6, equal), Tokyo (1.6, equal).
| City | Gap from Hiroshima, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Hiroshima (this page) | — | 32.8 | 25.1 | 131.4 | 207.3 |
| Osaka (closest) | 0.8 | 33.7 | 25.8 | 113.0 | 222.4 |
| Singapore (closest) | 0.8 | 31.4 | 25.3 | 146.9 | no data |
| Hong Kong (closest) | 1.6 | 31.3 | 26.7 | 453.2 | 182.1 |
| Tokyo (closest) | 1.6 | 31.3 | 23.5 | 154.7 | 174.2 |
| Madrid | 3.0 | 32.6 | 19.3 | 10.4 | no data |
| Barcelona | 3.1 | 29.7 | 22.1 | 51.2 | 258.2 |
| Rome | 3.3 | 31.6 | 19.8 | no data | no data |
| Seville | 3.7 | 35.6 | 20.6 | 2.5 | 364.3 |
| New York | 4.5 | 28.5 | 20.5 | 115.8 | no data |
| Los Angeles | 5.2 | 28.9 | 18.6 | 0.0 | no data |
| Chicago | 5.7 | 28.1 | 18.4 | 108.0 | no data |
| Vienna | 8.1 | 26.1 | 15.6 | 69.1 | 266.3 |
| Paris | 8.2 | 25.6 | 16.0 | 58.0 | 215.0 |
| Berlin | 9.2 | 24.9 | 14.7 | 58.1 | 221.3 |
| Prague | 9.2 | 25.7 | 13.8 | 76.2 | 230.4 |
| Munich | 9.4 | 24.7 | 14.5 | 116.5 | 232.1 |
| London | 10.0 | 23.3 | 14.6 | 54.9 | no data |
| Amsterdam | 11.1 | 22.4 | 13.4 | 98.6 | 203.5 |
| Buenos Aires | 15.6 | 17.9 | 8.9 | 70.3 | 171.6 |
Sources (1991-2020): WMO climate normals and NOAA U.S. Climate Normals, checked , ; Hong Kong: our 1991-2020 mean of the Hong Kong Observatory daily climate series on DATA.GOV.HK; Singapore: our 1991-2020 mean of the National Environment Agency monthly climate series on data.gov.sg; both checked . Each city's page names its station. All sources in full on Methodology.
Hong Kong figures: The Government of the Hong Kong Special Administrative Region and the Hong Kong Observatory own the intellectual property rights in the data; attribution to them and DATA.GOV.HK. Licence: Terms and Conditions of Use of DATA.GOV.HK, version 1.2.
Singapore figures: Contains information from the National Environment Agency on data.gov.sg, made available under the terms of the Singapore Open Data Licence version 1.0 (https://data.gov.sg/open-data-licence). The Agency does not endorse our means.
Sources
- 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 .
- holidays Python library, run locally. Attribution: holidays library, Vacanza team. Licence: MIT. Checked .
Cite this page: City by Month. "Hiroshima in August: weather, daylight, holidays". https://citybymonth.com/cities/japan/hiroshima/august/. Last updated 5 November 2026.