Hiroshima in September
In September, Hiroshima has 162.7 mm (6.41 in) of rain, a daily high of 29.1 °C (84.4 °F) and a daily low of 21.1 °C (70.0 °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: September misses our rule: days are 1.1 °C over our 28 °C and rain is 12.7 mm over our 150 mm. Expect 8.5 rain days and days that shorten by 1 h 01 min.
What September is like in Hiroshima
- From July to November, soft Karuga eggplants that melt in the mouth are on sale. They grow just in Karuga-cho, in Asakita Ward. Source: City of Hiroshima, checked .
- Ota River shijimi clams grow in clean sandy beds and reach the table from May to October. Their yellow shells show that the riverbed is clean. Source: City of Hiroshima, checked .
- In early September, people sit and draw Hiroshima Toshogu at the shrine's yearly sketching day. Source: Hiroshima Toshogu (official), checked .
Key figures
Weather in September, 1991-2020 means
- Daily high
- 29.1 °C (84.4 °F)
- Daily low
- 21.1 °C (70.0 °F)
- Rain
- 162.7 mm (6.41 in) in the month
- Sunshine
- 167.3 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 September the sea off Hiroshima averages 25.2 °C (77.4 °F), 1.1 °C cooler than in August.
Our 1991-2020 mean of NOAA OISST v2.1, checked .
Daylight on 15 September 2026
- Sunrise
- 05:53 local time
- Sunset
- 18:18 local time
- Day length
- 12 h 25 min
Day length 1-30 September: 12 h 54 min to 11 h 53 min, -1 h 01 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 | September | Rank |
|---|---|---|
| Daily high | 29.1 °C | 3rd warmest |
| Daily low | 21.1 °C | 3rd warmest |
| Rain | 162.7 mm | 4th wettest |
| Sunshine | 167.3 hours | 6th least sunny |
| Day length | 12 h 25 min | 6th longest |
Equal values share a rank. How we rank months
Sunshine share: 45% of the 371.8 hours from sunrise to sunset in September. How we compute sunshine share
Hiroshima in September, on average: 8.5 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 |
|---|---|---|
| Monday | Respect for the Aged Day | national |
| Tuesday | National Holiday | national |
| Wednesday | Autumnal Equinox Day | national |
| Date | Holiday | Scope |
|---|---|---|
| Monday | Respect for the Aged Day | national |
| Thursday | Autumnal Equinox 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 September by mean daily high. How we rank cities
Closest high and low in September: Osaka (0.6 °C apart), Tokyo (1.2), Los Angeles (2.0).
| City | Gap from Hiroshima, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Hiroshima (this page) | — | 29.1 | 21.1 | 162.7 | 167.3 |
| Osaka (closest) | 0.6 | 29.5 | 21.9 | 152.8 | 161.6 |
| Tokyo (closest) | 1.2 | 27.5 | 20.3 | 224.9 | 126.7 |
| Los Angeles (closest) | 2.0 | 28.3 | 17.9 | 3.3 | no data |
| Barcelona | 2.4 | 26.7 | 18.8 | 86.1 | 202.9 |
| Seville | 2.5 | 31.1 | 18.2 | 33.1 | 278.4 |
| Hong Kong | 3.2 | 30.5 | 26.1 | 321.4 | 174.4 |
| Singapore | 3.3 | 31.6 | 25.2 | 124.9 | no data |
| Rome | 3.8 | 26.7 | 16.0 | no data | no data |
| Madrid | 3.9 | 26.9 | 15.5 | 23.6 | no data |
| New York | 4.4 | 24.6 | 16.8 | 109.5 | no data |
| Chicago | 6.1 | 24.2 | 13.9 | 81.0 | no data |
| Paris | 7.9 | 21.5 | 13.0 | 44.7 | 174.0 |
| Vienna | 8.6 | 21.1 | 12.0 | 64.1 | 191.7 |
| London | 8.9 | 20.2 | 12.3 | 49.8 | no data |
| Berlin | 9.7 | 19.9 | 10.9 | 46.6 | 166.6 |
| Amsterdam | 10.0 | 19.2 | 11.0 | 84.4 | 154.2 |
| Buenos Aires | 10.0 | 19.7 | 10.6 | 80.6 | 178.9 |
| Munich | 10.1 | 19.6 | 10.4 | 78.1 | 169.7 |
| Prague | 10.1 | 20.1 | 9.9 | 41.8 | 164.6 |
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 September: weather, daylight, holidays". https://citybymonth.com/cities/japan/hiroshima/september/. Last updated 5 November 2026.