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 September:hot, Hiroshima, Japan · Records from 2006 to 2025. Not a forecast.
Mean high 30° Hottest day 37° (2010)
Mean low 22° Coldest night 13° (2011)
Rain days 9 days 4-17 by year
Rainfall 149mm Daylight 12.9 → 11.9 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 Finemuggy and storm risk
Humidity 75% 18 muggy days
Clear days 4 days 11 overcast days
Mean wind 7 km/h Rarely windy
Sunrise / sunset (15th) 05:53 / 18:18 Daylight 12.9 → 11.9 h
Hiroshima in September Tropical cyclones can still affect travel. If flights or the Shinkansen are disrupted, postpone the Miyajima trip first. The heat starts to ease. Check the weather a few days ahead.
September brought serious heat to Hiroshima, 30°C on a typical afternoon and 22°C overnight. Early mornings were the best time to be outside. Out of 30 days, about 9 brought rain; the rest stayed dry. It varied a lot from year to year. September 2010 had 4 rain days; 2016 had 17.
With 14 days above 30°C on average, most of the month felt like high summer. The warmest year was 2024, with highs averaging 33.3°C, 3.8°C above normal. Wet days did not mess around: about 17 mm each, the kind of rain that drives you into a doorway.
Typhoons i 11 of the last 20 years had a tropical storm pass within 300 km this month.
Nanmadol (2022), 89 km away typhoon strength Chanthu (2021), 103 km away tropical storm Talas (2011), 132 km away tropical storm 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
September 1 Wednesday 1 rain in 7 of 20 yrs 7/20 31° 24° September 2 Thursday 2 rain in 5 of 20 yrs 5/20 31° 23° September 3 Friday 3 rain in 7 of 20 yrs 7/20 31° 24° September 4 Saturday 4 rain in 7 of 20 yrs 7/20 31° 24° 1-4 rain on 33% of days 31° 24°
September 5 Sunday 5 rain in 7 of 20 yrs 7/20 31° 24° September 6 Monday 6 rain in 6 of 20 yrs 6/20 31° 23° September 7 Tuesday 7 rain in 6 of 20 yrs 6/20 31° 23° September 8 Wednesday 8 rain in 5 of 20 yrs 5/20 31° 23° September 9 Thursday 9 rain in 3 of 20 yrs 3/20 31° 22° September 10 Friday 10 rain in 6 of 20 yrs 6/20 31° 22° September 11 Saturday 11 rain in 6 of 20 yrs 6/20 31° 23° 5-11 rain on 28% of days 31° 23°
September 12 Sunday 12 rain in 7 of 20 yrs 7/20 30° 23° September 13 Monday 13 rain in 6 of 20 yrs 6/20 30° 23° September 14 Tuesday 14 rain in 5 of 20 yrs 5/20 30° 22° September 15 Wednesday 15 rain in 7 of 20 yrs 7/20 30° 22° September 16 Thursday 16 rain in 8 of 20 yrs 8/20 30° 22° September 17 Friday 17 rain in 9 of 20 yrs 9/20 30° 23° September 18 Saturday 18 rain in 8 of 20 yrs 8/20 30° 22° 12-18 rain on 36% of days 30° 22°
September 19 Sunday 19 rain in 4 of 20 yrs 4/20 30° 21° September 20 Monday 20 rain in 5 of 20 yrs 5/20 28° 20° September 21 Tuesday 21 rain in 5 of 20 yrs 5/20 28° 20° September 22 Wednesday 22 rain in 6 of 20 yrs 6/20 28° 20° September 23 Thursday 23 rain in 3 of 20 yrs 3/20 28° 20° September 24 Friday 24 rain in 5 of 20 yrs 5/20 28° 19° September 25 Saturday 25 rain in 4 of 20 yrs 4/20 28° 20° 19-25 rain on 23% of days 28° 20°
September 26 Sunday 26 rain in 3 of 20 yrs 3/20 29° 20° September 27 Monday 27 rain in 5 of 20 yrs 5/20 28° 20° September 28 Tuesday 28 rain in 3 of 20 yrs 3/20 28° 19° September 29 Wednesday 29 rain in 5 of 20 yrs 5/20 27° 19° September 30 Thursday 30 rain in 8 of 20 yrs 8/20 26° 19°
26-30 rain on 24% of days 28° 19°
1-4 rain on 33% of days 31° 24° 5-11 rain on 28% of days 31° 23° 12-18 rain on 36% of days 30° 22° 19-25 rain on 23% of days 28° 20° 26-30 rain on 24% of days 28° 19°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Friday 1 rain in 7 of 20 yrs 7/20 31° 24° September 2 Saturday 2 rain in 5 of 20 yrs 5/20 31° 23° 1-2 rain on 30% of days 31° 24°
September 3 Sunday 3 rain in 7 of 20 yrs 7/20 31° 24° September 4 Monday 4 rain in 7 of 20 yrs 7/20 31° 24° September 5 Tuesday 5 rain in 7 of 20 yrs 7/20 31° 24° September 6 Wednesday 6 rain in 6 of 20 yrs 6/20 31° 23° September 7 Thursday 7 rain in 6 of 20 yrs 6/20 31° 23° September 8 Friday 8 rain in 5 of 20 yrs 5/20 31° 23° September 9 Saturday 9 rain in 3 of 20 yrs 3/20 31° 22° 3-9 rain on 29% of days 31° 23°
September 10 Sunday 10 rain in 6 of 20 yrs 6/20 31° 22° September 11 Monday 11 rain in 6 of 20 yrs 6/20 31° 23° September 12 Tuesday 12 rain in 7 of 20 yrs 7/20 30° 23° September 13 Wednesday 13 rain in 6 of 20 yrs 6/20 30° 23° September 14 Thursday 14 rain in 5 of 20 yrs 5/20 30° 22° September 15 Friday 15 rain in 7 of 20 yrs 7/20 30° 22° September 16 Saturday 16 rain in 8 of 20 yrs 8/20 30° 22° 10-16 rain on 32% of days 30° 22°
September 17 Sunday 17 rain in 9 of 20 yrs 9/20 30° 23° September 18 Monday 18 rain in 8 of 20 yrs 8/20 30° 22° September 19 Tuesday 19 rain in 4 of 20 yrs 4/20 30° 21° September 20 Wednesday 20 rain in 5 of 20 yrs 5/20 28° 20° September 21 Thursday 21 rain in 5 of 20 yrs 5/20 28° 20° September 22 Friday 22 rain in 6 of 20 yrs 6/20 28° 20° September 23 Saturday 23 rain in 3 of 20 yrs 3/20 28° 20° 17-23 rain on 29% of days 29° 21°
September 24 Sunday 24 rain in 5 of 20 yrs 5/20 28° 19° September 25 Monday 25 rain in 4 of 20 yrs 4/20 28° 20° September 26 Tuesday 26 rain in 3 of 20 yrs 3/20 29° 20° September 27 Wednesday 27 rain in 5 of 20 yrs 5/20 28° 20° September 28 Thursday 28 rain in 3 of 20 yrs 3/20 28° 19° September 29 Friday 29 rain in 5 of 20 yrs 5/20 27° 19° September 30 Saturday 30 rain in 8 of 20 yrs 8/20 26° 19° 24-30 rain on 24% of days 28° 19°
1-2 rain on 30% of days 31° 24° 3-9 rain on 29% of days 31° 23° 10-16 rain on 32% of days 30° 22° 17-23 rain on 29% of days 29° 21° 24-30 rain on 24% of days 28° 19°
Tap another date to change
2006 15mm
2007 11mm
2008 none
2009 none
2010 none
2011 28mm
2012 10mm
2013 none
2014 none
2015 5mm
2016 3mm
2017 87mm
2018 none
2019 none
2020 22mm
2021 52mm
2022 none
2023 none
2024 none
2025 none
Holidays in September (2027) September 18 to September 20 Respect for the Aged Day long weekendSeptember 23 Autumnal Equinox DaySeptember 6 Labor Day 1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)
Holidays in September (2028)
Day by day temperature i 17° 24° 31° 38° 1 8 15 22 29 30
Your trip dates, the past 20 years Trip dates September 1 (Wed) 2 (Thu) 3 (Fri) 4 (Sat) 5 (Sun) 6 (Mon) 7 (Tue) 8 (Wed) 9 (Thu) 10 (Fri) 11 (Sat) 12 (Sun) 13 (Mon) 14 (Tue) 15 (Wed) 16 (Thu) 17 (Fri) 18 (Sat) 19 (Sun) 20 (Mon) 21 (Tue) 22 (Wed) 23 (Thu) 24 (Fri) 25 (Sat) 26 (Sun) 27 (Mon) 28 (Tue) 29 (Wed) 30 (Thu) ~ September 1 (Wed) 2 (Thu) 3 (Fri) 4 (Sat) 5 (Sun) 6 (Mon) 7 (Tue) 8 (Wed) 9 (Thu) 10 (Fri) 11 (Sat) 12 (Sun) 13 (Mon) 14 (Tue) 15 (Wed) 16 (Thu) 17 (Fri) 18 (Sat) 19 (Sun) 20 (Mon) 21 (Tue) 22 (Wed) 23 (Thu) 24 (Fri) 25 (Sat) 26 (Sun) 27 (Mon) 28 (Tue) 29 (Wed) 30 (Thu) 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
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 10 Fri Pick September 10
6 11 Sat Pick September 11
6 12 Sun Pick September 12
7 13 Mon Pick September 13
6 14 Tue Pick September 14
5 15 Wed Pick September 15
7 16 Thu Pick September 16
8 17 Fri Pick September 17
9 18 Sat Pick September 18
8 19 Sun Pick September 19
4 20 Mon Pick September 20
5 21 Tue Pick September 21
5 22 Wed Pick September 22
6 23 Thu Pick September 23
3 24 Fri Pick September 24
5 25 Sat Pick September 25
4 26 Sun Pick September 26
3 27 Mon Pick September 27
5 28 Tue Pick September 28
3 29 Wed Pick September 29
5 30 Thu Pick September 30
8 Dates outside your trip are dimmed.
One row per year, one cell per day. 2010 had 4 rain days, 2016 had 17.
Hiroshima through the year What to pack At 30°C by day and 22°C at night with humid air, sweat hardly dried. Quick-dry fabrics beat heavy cotton, and a spare top saved the evening.
With 9 rain days, a pocket umbrella was insurance rather than a daily tool.
Common questions Does it rain a lot in Hiroshima in September? Over the past 20 years September averaged 9 rain days (1 mm or more) out of 30. Individual years ran from 4 in the driest to 17 in the wettest.
What should I wear in Hiroshima in September? Days averaged 30°C and nights 22°C. Pack a compact umbrella, T-shirts, sunscreen plus a hat, and insect repellent.
Is September a good time to visit Hiroshima? On warmth and rain days alone, Hiroshima's easiest months were May and October. September ranked 6 of 12.
Is Hiroshima humid in September? Mean relative humidity was 75%, with about 18 muggy days (dew point of 20°C or more) in the month.
Previous month Hiroshima in August Next month Hiroshima in October Whole year Hiroshima weather by month Where to go September By country Japan: all cities this month