Monthly climate guide
Hiroshima weather in September
With highs near 26°C (78°F) and lows around 17°C (63°F), September feels warm in Hiroshima. Rainfall averages about 200 mm (very wet) and the sky is often cloudy. Daytime highs are 4°C cooler than August and 5°C warmer than October.
What stands out in September
- Rain is above Hiroshima's usual level, by about 50%.
- It cools down fast from here: October is about 5°C cooler.
- Humidity near 84% makes 26°C feel stickier than it sounds.
- Only 2 months are warmer in Hiroshima than September.
Avg high
26°C
78°F
Avg low
17°C
63°F
Rainfall
200 mm
very wet
Humidity
84%
relative
Sky
72%
cloud · often cloudy
Hiroshima weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 6°C / 43°F | -1°C / 29°F | 62 mm | 84% | 74% |
| February | 8°C / 46°F | -1°C / 30°F | 70 mm | 83% | 75% |
| March | 12°C / 54°F | 1°C / 34°F | 103 mm | 80% | 65% |
| April | 17°C / 63°F | 6°C / 42°F | 128 mm | 78% | 64% |
| May | 22°C / 72°F | 11°C / 52°F | 120 mm | 77% | 63% |
| June | 25°C / 77°F | 16°C / 61°F | 239 mm | 83% | 80% |
| July | 29°C / 83°F | 21°C / 70°F | 255 mm | 86% | 74% |
| August | 30°C / 86°F | 22°C / 71°F | 135 mm | 83% | 65% |
| September | 26°C / 78°F | 17°C / 63°F | 200 mm | 84% | 72% |
| October | 21°C / 69°F | 11°C / 52°F | 130 mm | 83% | 62% |
| November | 15°C / 59°F | 6°C / 42°F | 71 mm | 84% | 64% |
| December | 9°C / 47°F | 0°C / 33°F | 87 mm | 84% | 74% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is September a good time to visit Hiroshima?
Compare the months in the chart above to find your ideal window.
Best time to visit Hiroshima →Other Japan cities in September
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Hiroshima weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/japan/hiroshima/september
<a href="https://weathercompare.eu/weather/japan/hiroshima/september">Hiroshima weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/japan/hiroshima" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Hiroshima weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/japan/hiroshima/september">Hiroshima weather in September</a> – WeatherCompare</p>
Hiroshima in September: quick answers
Is September a good time to visit Hiroshima?
September is one of the wetter months in Hiroshima, with about 200 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Hiroshima in September?
Average highs are about 26°C (78°F) and average lows about 17°C (63°F), based on 10 years of daily data.
Does it rain a lot in Hiroshima in September?
Hiroshima typically gets around 200 mm of rain in September — very wet.
Figures are long-term averages for the area around Hiroshima (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.