Hiroshima Weather in September

Hiroshima in September averages 29°C (84°F) during the day and 20°C (68°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Hiroshima in September

The climate data from previous years indicates about 16 days of rain, averaging 170 mm (6.7 in) for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.

Temperature in Hiroshima in September

September in Hiroshima brings high temperatures, with highs of 29°C (84°F) and nights around 20°C (68°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights are mild at around 20°C (68°F), which is comfortable for most people.

Sunshine in Hiroshima in September

The area experiences a moderate amount of sunshine, with approximately 169 hours of sunlight expected. This means a decent mix of sun and overcast.

Wind Speed in Hiroshima in September

September sees wind speeds averaging 2 m/s (4 knots). You'll typically experience pleasant light breezes that move leaves slightly and feel refreshing. As an average, expect variation from very calm days to periods with more apparent air movement.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. April, May, September, October and November typically offer the best weather for Hiroshima.

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• January
• February
• March
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• May
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• October
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For a detailed overview over the year and the best time to visit Japan, check out our Hiroshima's climate page.

Hiroshima Temperature in September

Min Temperature 20°C (68°F)  

Max Temperature 29°C (84°F)  

Chance of Rain 54%  

Precipitation 170 mm (6.7 in)  

Rainy days 16 days  

Humidity 68%  

Windspeed 2 m/s (4 knots)  

Sunshine 169 hours  

Percentage Sunshine 43%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Hiroshima typically drop from around 29°C (84°F) at the start of September to approximately 25°C (77°F) by the end. Nights are warm, with lows typically ranging from 18°C (64°F) to 23°C (73°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Hiroshima in September

Browse day-by-day weather records for Hiroshima spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Hiroshima historical weather extremes in September

Our historical data for Hiroshima spans 1976 to 2025, revealing these weather extremes.

• On September 1, 2010, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
• Hiroshima experienced its chilliest September day on September 29, 2008, reaching only 18°C (64°F).
• The coldest night in September in Hiroshima was on September 28, 1987, with a minimum of 10°C (50°F).
• The wettest day in September Hiroshima was on September 30, 2018 with 94 mm (3.7 in) of precipitation.

What to Wear in Hiroshima in September

Warm but pleasant conditions in Hiroshima in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Hiroshima in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Japan, check out our Hiroshima's climate page.

More climate data for Hiroshima

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Hiroshima climate overview or explore weather in Japan.