January 10° · ☂ 5 February 11° · ☂ 7 March 15° · ☂ 9 April 20° · ☂ 9 ★ May24° · ☂ 8 June 27° · ☂ 11 July 31° · ☂ 11 August 33° · ☂ 8 September 30° · ☂ 9 ★ October24° · ☂ 7 November 18° · ☂ 6 December 12° · ☂ 7 Hiroshima in August:seriously hot, occasional rain Hiroshima, Japan · Records from 2006 to 2025. Not a forecast.
Mean high 33° Hottest day 38.2° (2018)
Mean low 25° Coldest night 18.3° (2018)
Rain days 8 days 3-17 by year
Rainfall 177mm Daylight 13.9 → 13.0 h
Hiroshima's 12 months i Best: May and October
1 2 3 4 5 6 7 8 9 10 11 12
Trip types Sightseeing on foot Poorhot, muggy and storm risk
Humidity 75% 30 muggy days
Clear days 5 days 11 overcast days
Mean wind 7 km/h Rarely windy
Sunrise / sunset (15th) 05:31 / 18:59 Daylight 13.9 → 13.0 h
Hiroshima in August The hottest month, but drier than the rainy season. On the evening of August 6 paper lanterns are floated on the Motoyasu River for peace, and visitors can launch one from the bank opposite the Atomic Bomb Dome. Watch tropical cyclone news from late month.
Highs averaged 33°C and lows stayed at 25°C, so the heat hung on long after sunset. Showers came now and then, about 8 rain days in all, and most of the month stayed dry. A visitor in 2010 met 3 rain days; one in 2014 met 17. The average of 8 hid that gap.
26 days past 30°C made it a month for early starts and a long lunch indoors. August 2024 averaged 34.9°C by day, 2.0°C above the 20-year mean. Rain days averaged 22 mm each, so when it rained it rained properly.
Typhoons i 11 of the last 20 years had a tropical storm pass within 300 km this month.
Lupit (2021), 16 km away tropical storm Krosa (2019), 32 km away tropical storm Shanshan (2024), 66 km away typhoon strength 1 2 3 4 1 5 1 6 6 7 11 8 11 9 3 10 11 12
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
August 1 Sunday 1 rain in 1 of 20 yrs 1/20 34° 26° August 2 Monday 2 rain in 2 of 20 yrs 2/20 34° 26° August 3 Tuesday 3 rain in 4 of 20 yrs 4/20 34° 26° August 4 Wednesday 4 rain in 4 of 20 yrs 4/20 34° 26° August 5 Thursday 5 rain in 3 of 20 yrs 3/20 34° 26° August 6 Friday 6 rain in 3 of 20 yrs 3/20 34° 26° August 7 Saturday 7 rain in 6 of 20 yrs 6/20 34° 26° 1-7 rain on 16% of days 34° 26°
August 8 Sunday 8 rain in 3 of 20 yrs 3/20 34° 26° August 9 Monday 9 rain in 6 of 20 yrs 6/20 33° 26° August 10 Tuesday 10 rain in 5 of 20 yrs 5/20 34° 26° August 11 Wednesday 11 rain in 6 of 20 yrs 6/20 33° 26° August 12 Thursday 12 rain in 8 of 20 yrs 8/20 33° 26° August 13 Friday 13 rain in 3 of 20 yrs 3/20 33° 26° August 14 Saturday 14 rain in 5 of 20 yrs 5/20 33° 26° 8-14 rain on 26% of days 33° 26°
August 15 Sunday 15 rain in 7 of 20 yrs 7/20 33° 26° August 16 Monday 16 rain in 6 of 20 yrs 6/20 33° 26° August 17 Tuesday 17 rain in 8 of 20 yrs 8/20 33° 25° August 18 Wednesday 18 rain in 5 of 20 yrs 5/20 33° 25° August 19 Thursday 19 rain in 7 of 20 yrs 7/20 33° 25° August 20 Friday 20 rain in 5 of 20 yrs 5/20 33° 25° August 21 Saturday 21 rain in 5 of 20 yrs 5/20 33° 25° 15-21 rain on 31% of days 33° 25°
August 22 Sunday 22 rain in 7 of 20 yrs 7/20 33° 25° August 23 Monday 23 rain in 9 of 20 yrs 9/20 33° 25° August 24 Tuesday 24 rain in 6 of 20 yrs 6/20 32° 25° August 25 Wednesday 25 rain in 5 of 20 yrs 5/20 32° 25° August 26 Thursday 26 rain in 3 of 20 yrs 3/20 32° 24° August 27 Friday 27 rain in 4 of 20 yrs 4/20 32° 24° August 28 Saturday 28 rain in 5 of 20 yrs 5/20 32° 25° 22-28 rain on 28% of days 32° 25°
August 29 Sunday 29 rain in 7 of 20 yrs 7/20 31° 24° August 30 Monday 30 rain in 8 of 20 yrs 8/20 31° 24° August 31 Tuesday 31 rain in 6 of 20 yrs 6/20 32° 24°
29-31 rain on 35% of days 31° 24°
1-7 rain on 16% of days 34° 26° 8-14 rain on 26% of days 33° 26° 15-21 rain on 31% of days 33° 25° 22-28 rain on 28% of days 32° 25° 29-31 rain on 35% of days 31° 24°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
August 1 Tuesday 1 rain in 1 of 20 yrs 1/20 34° 26° August 2 Wednesday 2 rain in 2 of 20 yrs 2/20 34° 26° August 3 Thursday 3 rain in 4 of 20 yrs 4/20 34° 26° August 4 Friday 4 rain in 4 of 20 yrs 4/20 34° 26° August 5 Saturday 5 rain in 3 of 20 yrs 3/20 34° 26° 1-5 rain on 14% of days 34° 26°
August 6 Sunday 6 rain in 3 of 20 yrs 3/20 34° 26° August 7 Monday 7 rain in 6 of 20 yrs 6/20 34° 26° August 8 Tuesday 8 rain in 3 of 20 yrs 3/20 34° 26° August 9 Wednesday 9 rain in 6 of 20 yrs 6/20 33° 26° August 10 Thursday 10 rain in 5 of 20 yrs 5/20 34° 26° August 11 Friday 11 rain in 6 of 20 yrs 6/20 33° 26° August 12 Saturday 12 rain in 8 of 20 yrs 8/20 33° 26° 6-12 rain on 26% of days 33° 26°
August 13 Sunday 13 rain in 3 of 20 yrs 3/20 33° 26° August 14 Monday 14 rain in 5 of 20 yrs 5/20 33° 26° August 15 Tuesday 15 rain in 7 of 20 yrs 7/20 33° 26° August 16 Wednesday 16 rain in 6 of 20 yrs 6/20 33° 26° August 17 Thursday 17 rain in 8 of 20 yrs 8/20 33° 25° August 18 Friday 18 rain in 5 of 20 yrs 5/20 33° 25° August 19 Saturday 19 rain in 7 of 20 yrs 7/20 33° 25° 13-19 rain on 29% of days 33° 25°
August 20 Sunday 20 rain in 5 of 20 yrs 5/20 33° 25° August 21 Monday 21 rain in 5 of 20 yrs 5/20 33° 25° August 22 Tuesday 22 rain in 7 of 20 yrs 7/20 33° 25° August 23 Wednesday 23 rain in 9 of 20 yrs 9/20 33° 25° August 24 Thursday 24 rain in 6 of 20 yrs 6/20 32° 25° August 25 Friday 25 rain in 5 of 20 yrs 5/20 32° 25° August 26 Saturday 26 rain in 3 of 20 yrs 3/20 32° 24° 20-26 rain on 29% of days 33° 25°
August 27 Sunday 27 rain in 4 of 20 yrs 4/20 32° 24° August 28 Monday 28 rain in 5 of 20 yrs 5/20 32° 25° August 29 Tuesday 29 rain in 7 of 20 yrs 7/20 31° 24° August 30 Wednesday 30 rain in 8 of 20 yrs 8/20 31° 24° August 31 Thursday 31 rain in 6 of 20 yrs 6/20 32° 24°
27-31 rain on 30% of days 32° 24°
1-5 rain on 14% of days 34° 26° 6-12 rain on 26% of days 33° 26° 13-19 rain on 29% of days 33° 25° 20-26 rain on 29% of days 33° 25° 27-31 rain on 30% of days 32° 24°
Tap another date to change
2006 1mm
2007 3mm
2008 9mm
2009 none
2010 none
2011 19mm
2012 1mm
2013 none
2014 none
2015 none
2016 none
2017 none
2018 none
2019 22mm
2020 6mm
2021 1mm
2022 none
2023 14mm
2024 none
2025 none
Holidays in August (2027) August 11 Mountain DayAugust 13 to August 16 Obon 1 Local public holiday or break (busier, pricier)
Holidays in August (2028)
Day by day temperature i 23° 29° 34° 40° 1 8 15 22 29 31
Your trip dates, the past 20 years Trip dates August 1 (Sun) 2 (Mon) 3 (Tue) 4 (Wed) 5 (Thu) 6 (Fri) 7 (Sat) 8 (Sun) 9 (Mon) 10 (Tue) 11 (Wed) 12 (Thu) 13 (Fri) 14 (Sat) 15 (Sun) 16 (Mon) 17 (Tue) 18 (Wed) 19 (Thu) 20 (Fri) 21 (Sat) 22 (Sun) 23 (Mon) 24 (Tue) 25 (Wed) 26 (Thu) 27 (Fri) 28 (Sat) 29 (Sun) 30 (Mon) 31 (Tue) ~ August 1 (Sun) 2 (Mon) 3 (Tue) 4 (Wed) 5 (Thu) 6 (Fri) 7 (Sat) 8 (Sun) 9 (Mon) 10 (Tue) 11 (Wed) 12 (Thu) 13 (Fri) 14 (Sat) 15 (Sun) 16 (Mon) 17 (Tue) 18 (Wed) 19 (Thu) 20 (Fri) 21 (Sat) 22 (Sun) 23 (Mon) 24 (Tue) 25 (Wed) 26 (Thu) 27 (Fri) 28 (Sat) 29 (Sun) 30 (Mon) 31 (Tue) 1-7 8-14 15-21 22-end Whole month
You can also click two dates on the axis. Hover a cell to see that day's rain. By year Driest trips first
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Trip rain days Month rain days Tap a date to start, tap another to end. Each cell is that date in one year. '06 '07 '08 '09 '10 '11 '12 '13 '14 '15 '16 '17 '18 '19 '20 '21 '22 '23 '24 '25
of 20 Dates outside your trip are dimmed.
One row per year, one cell per day. 2010 had 3 rain days, 2014 had 17.
Hiroshima through the year What to pack At 33°C by day and 25°C at night with humid air, sweat hardly dried. Quick-dry fabrics beat heavy cotton, and a spare top saved the evening.
Rain was occasional. A compact umbrella in the bag is enough.
Common questions Does it rain a lot in Hiroshima in August? Over the past 20 years August averaged 8 rain days (1 mm or more) out of 31. Individual years ran from 3 in the driest to 17 in the wettest.
What should I wear in Hiroshima in August? Days averaged 33°C and nights 25°C. Pack a compact umbrella, T-shirts, sunscreen plus a hat, and insect repellent.
Is August a good time to visit Hiroshima? On warmth and rain days alone, Hiroshima's easiest months were May and October. August ranked 7 of 12.
Is Hiroshima humid in August? Mean relative humidity was 75%, with about 30 muggy days (dew point of 20°C or more) in the month.
Previous month Hiroshima in July Next month Hiroshima in September Whole year Hiroshima weather by month Where to go August By country Japan: all cities this month