Hiroshima in May
In May, Hiroshima has 169.8 mm (6.69 in) of rain, a daily high of 24.4 °C (75.9 °F) and a daily low of 15.1 °C (59.2 °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: May misses our rule: rain is 19.8 mm over our 150 mm. Expect 8.6 rain days and days that grow by 44 min.
What May is like in Hiroshima
- A flower parade moves along Peace Boulevard on the opening day of the Hiroshima Flower Festival in early May. Booths fill the green strips of the boulevard and Peace Memorial Park. Source: Hiroshima Flower Festival Executive Committee, checked .
- Children wrestle sumo and shrine maidens dance at Hiroshima Gokoku Shrine on the last Friday to Sunday of May. It is the Manto Mitama festival. Source: Hiroshima Gokoku Shrine, checked .
- Rhododendrons bloom from late April to late May at Fureai-no-Sato Mikuni, a park in the hills of north-west Hiroshima. It has some five thousand five hundred bushes of about a hundred and seventy kinds. Source: Dive! Hiroshima (Hiroshima Tourism Association, official), checked .
Key figures
Weather in May, 1991-2020 means
- Daily high
- 24.4 °C (75.9 °F)
- Daily low
- 15.1 °C (59.2 °F)
- Rain
- 169.8 mm (6.69 in) in the month
- Sunshine
- 210.8 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 May the sea off Hiroshima averages 17.0 °C (62.6 °F), 2.4 °C warmer than in April.
Our 1991-2020 mean of NOAA OISST v2.1, checked .
Daylight on 15 May 2026
- Sunrise
- 05:08 local time
- Sunset
- 19:05 local time
- Day length
- 13 h 57 min
Day length 1-31 May: 13 h 33 min to 14 h 17 min, +44 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 | May | Rank |
|---|---|---|
| Daily high | 24.4 °C | 5th warmest |
| Daily low | 15.1 °C | 5th warmest |
| Rain | 169.8 mm | 3rd wettest |
| Sunshine | 210.8 hours | sunniest |
| Day length | 13 h 57 min | 3rd longest |
Equal values share a rank. How we rank months
Sunshine share: 49% of the 432.6 hours from sunrise to sunset in May. How we compute sunshine share
Hiroshima in May, on average: 8.6 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 |
|---|---|---|
| Sunday | Constitution Day | national |
| Monday | Greenery Day | national |
| Tuesday | Children's Day | national |
| Wednesday | Substitute Holiday | national |
| Date | Holiday | Scope |
|---|---|---|
| Monday | Constitution Day | national |
| Tuesday | Greenery Day | national |
| Wednesday | Children's 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 15 of our 20 cities in May by mean daily high. How we rank cities
Closest high and low in May: Osaka (0.7 °C apart, equal), Tokyo (0.7, equal), Los Angeles (0.9).
| City | Gap from Hiroshima, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Hiroshima (this page) | — | 24.4 | 15.1 | 169.8 | 210.8 |
| Osaka (closest) | 0.7 | 24.9 | 16.0 | 136.5 | 203.7 |
| Tokyo (closest) | 0.7 | 23.6 | 14.6 | 139.7 | 179.6 |
| Los Angeles (closest) | 0.9 | 23.2 | 14.5 | 8.1 | no data |
| Barcelona | 1.3 | 22.2 | 14.7 | 41.9 | 240.7 |
| Rome | 1.8 | 23.4 | 12.6 | no data | no data |
| Seville | 1.9 | 27.8 | 14.7 | 33.9 | 324.9 |
| Madrid | 2.1 | 23.5 | 11.9 | 48.3 | no data |
| New York | 2.4 | 21.9 | 12.8 | 100.6 | no data |
| Chicago | 3.9 | 21.4 | 10.3 | 114.0 | no data |
| Paris | 4.1 | 20.2 | 11.1 | 69.0 | 201.0 |
| Vienna | 4.1 | 20.7 | 10.7 | 78.9 | 248.3 |
| Buenos Aires | 4.5 | 19.4 | 11.1 | 93.5 | 157.4 |
| Berlin | 5.3 | 19.6 | 9.3 | 52.3 | 224.3 |
| Prague | 5.3 | 20.1 | 8.9 | 67.0 | 221.5 |
| Munich | 5.4 | 19.4 | 9.3 | 107.0 | 213.0 |
| London | 5.7 | 18.4 | 9.7 | 44.7 | no data |
| Amsterdam | 6.6 | 17.8 | 8.6 | 53.9 | 230.7 |
| Hong Kong | 6.9 | 28.8 | 24.5 | 290.6 | 138.8 |
| Singapore | 9.3 | 32.3 | 25.7 | 164.3 | no data |
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 May: weather, daylight, holidays". https://citybymonth.com/cities/japan/hiroshima/may/. Last updated 5 November 2026.