January 11° · ☂ 8 February 12° · ☂ 10 March 16° · ☂ 9 April 20° · ☂ 9 ★ May24° · ☂ 9 June 27° · ☂ 13 July 31° · ☂ 11 August 32° · ☂ 11 September 29° · ☂ 10 ★ October24° · ☂ 6 November 19° · ☂ 8 December 13° · ☂ 9 Nagasaki in September:properly hot, frequent rain Nagasaki, Japan · Records from 2006 to 2025. Not a forecast.
Mean high 29° Hottest day 35.5° (2024)
Mean low 22° Coldest night 16.2° (2012)
Rain days 10 days 3-21 by year
Rainfall 176mm Daylight 12.9 → 11.9 h
Nagasaki'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 79% 21 muggy days
Clear days 7 days 10 overcast days
Mean wind 13 km/h 1 windy day
Sunrise / sunset (15th) 06:04 / 18:28 Daylight 12.9 → 11.9 h
Nagasaki in September Typhoons pass in many years, so boats can stop and island tours get cancelled. Landing on Gunkanjima may be impossible in high waves and refund terms differ by operator, so check them when booking. The heat lingers to the end of the month.
It was a hot month: 29°C by day and 22°C after dark. With 10 rain days on average, a wet day was rarely more than a few days away. A visitor in 2009 met 3 rain days; one in 2025 met 21. The average of 10 hid that gap.
11 days past 30°C made it a month for early starts and a long lunch indoors. September 2024 averaged 32.2°C by day, 2.9°C above the 20-year mean. Wet days did not mess around: about 17 mm each, the kind of rain that drives you into a doorway.
Typhoons i 13 of the last 20 years had a tropical storm pass within 300 km this month.
Namtheun (2016), 9 km away typhoon strength Shanshan (2006), 32 km away typhoon strength Nanmadol (2022), 51 km away typhoon strength 1 2 3 4 1 5 6 6 7 13 8 13 9 5 10 11 12
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Wednesday 1 rain in 9 of 20 yrs 9/20 30° 24° September 2 Thursday 2 rain in 9 of 20 yrs 9/20 30° 24° September 3 Friday 3 rain in 8 of 20 yrs 8/20 30° 23° September 4 Saturday 4 rain in 6 of 20 yrs 6/20 30° 24° 1-4 rain on 40% of days 30° 24°
September 5 Sunday 5 rain in 7 of 20 yrs 7/20 30° 24° September 6 Monday 6 rain in 7 of 20 yrs 7/20 31° 23° September 7 Tuesday 7 rain in 8 of 20 yrs 8/20 30° 23° September 8 Wednesday 8 rain in 5 of 20 yrs 5/20 30° 23° September 9 Thursday 9 rain in 4 of 20 yrs 4/20 30° 23° September 10 Friday 10 rain in 5 of 20 yrs 5/20 30° 23° September 11 Saturday 11 rain in 5 of 20 yrs 5/20 30° 23° 5-11 rain on 29% of days 30° 23°
September 12 Sunday 12 rain in 8 of 20 yrs 8/20 30° 23° September 13 Monday 13 rain in 8 of 20 yrs 8/20 30° 23° September 14 Tuesday 14 rain in 7 of 20 yrs 7/20 30° 23° September 15 Wednesday 15 rain in 11 of 20 yrs 11/20 30° 23° September 16 Thursday 16 rain in 10 of 20 yrs 10/20 30° 23° September 17 Friday 17 rain in 13 of 20 yrs 13/20 29° 23° September 18 Saturday 18 rain in 8 of 20 yrs 8/20 29° 22° 12-18 rain on 46% of days 30° 23°
September 19 Sunday 19 rain in 5 of 20 yrs 5/20 29° 22° September 20 Monday 20 rain in 6 of 20 yrs 6/20 28° 21° September 21 Tuesday 21 rain in 5 of 20 yrs 5/20 28° 21° September 22 Wednesday 22 rain in 9 of 20 yrs 9/20 28° 21° September 23 Thursday 23 rain in 2 of 20 yrs 2/20 28° 21° September 24 Friday 24 rain in 5 of 20 yrs 5/20 28° 21° September 25 Saturday 25 rain in 2 of 20 yrs 2/20 29° 21° 19-25 rain on 24% of days 28° 21°
September 26 Sunday 26 rain in 2 of 20 yrs 2/20 29° 21° September 27 Monday 27 rain in 6 of 20 yrs 6/20 28° 21° September 28 Tuesday 28 rain in 5 of 20 yrs 5/20 28° 21° September 29 Wednesday 29 rain in 8 of 20 yrs 8/20 28° 21° September 30 Thursday 30 rain in 9 of 20 yrs 9/20 27° 21°
26-30 rain on 30% of days 28° 21°
1-4 rain on 40% of days 30° 24° 5-11 rain on 29% of days 30° 23° 12-18 rain on 46% of days 30° 23° 19-25 rain on 24% of days 28° 21° 26-30 rain on 30% of days 28° 21°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Friday 1 rain in 9 of 20 yrs 9/20 30° 24° September 2 Saturday 2 rain in 9 of 20 yrs 9/20 30° 24° 1-2 rain on 45% of days 30° 24°
September 3 Sunday 3 rain in 8 of 20 yrs 8/20 30° 23° September 4 Monday 4 rain in 6 of 20 yrs 6/20 30° 24° September 5 Tuesday 5 rain in 7 of 20 yrs 7/20 30° 24° September 6 Wednesday 6 rain in 7 of 20 yrs 7/20 31° 23° September 7 Thursday 7 rain in 8 of 20 yrs 8/20 30° 23° September 8 Friday 8 rain in 5 of 20 yrs 5/20 30° 23° September 9 Saturday 9 rain in 4 of 20 yrs 4/20 30° 23° 3-9 rain on 32% of days 30° 23°
September 10 Sunday 10 rain in 5 of 20 yrs 5/20 30° 23° September 11 Monday 11 rain in 5 of 20 yrs 5/20 30° 23° September 12 Tuesday 12 rain in 8 of 20 yrs 8/20 30° 23° September 13 Wednesday 13 rain in 8 of 20 yrs 8/20 30° 23° September 14 Thursday 14 rain in 7 of 20 yrs 7/20 30° 23° September 15 Friday 15 rain in 11 of 20 yrs 11/20 30° 23° September 16 Saturday 16 rain in 10 of 20 yrs 10/20 30° 23° 10-16 rain on 39% of days 30° 23°
September 17 Sunday 17 rain in 13 of 20 yrs 13/20 29° 23° September 18 Monday 18 rain in 8 of 20 yrs 8/20 29° 22° September 19 Tuesday 19 rain in 5 of 20 yrs 5/20 29° 22° September 20 Wednesday 20 rain in 6 of 20 yrs 6/20 28° 21° September 21 Thursday 21 rain in 5 of 20 yrs 5/20 28° 21° September 22 Friday 22 rain in 9 of 20 yrs 9/20 28° 21° September 23 Saturday 23 rain in 2 of 20 yrs 2/20 28° 21° 17-23 rain on 34% of days 29° 22°
September 24 Sunday 24 rain in 5 of 20 yrs 5/20 28° 21° September 25 Monday 25 rain in 2 of 20 yrs 2/20 29° 21° September 26 Tuesday 26 rain in 2 of 20 yrs 2/20 29° 21° September 27 Wednesday 27 rain in 6 of 20 yrs 6/20 28° 21° September 28 Thursday 28 rain in 5 of 20 yrs 5/20 28° 21° September 29 Friday 29 rain in 8 of 20 yrs 8/20 28° 21° September 30 Saturday 30 rain in 9 of 20 yrs 9/20 27° 21° 24-30 rain on 26% of days 28° 21°
1-2 rain on 45% of days 30° 24° 3-9 rain on 32% of days 30° 23° 10-16 rain on 39% of days 30° 23° 17-23 rain on 34% of days 29° 22° 24-30 rain on 26% of days 28° 21°
Tap another date to change
2006 55mm
2007 5mm
2008 7mm
2009 none
2010 none
2011 2mm
2012 6mm
2013 none
2014 none
2015 13mm
2016 12mm
2017 114mm
2018 none
2019 none
2020 17mm
2021 30mm
2022 2mm
2023 25mm
2024 none
2025 9mm
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 20° 26° 31° 37° 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
5 11 Sat Pick September 11
5 12 Sun Pick September 12
8 13 Mon Pick September 13
8 14 Tue Pick September 14
7 15 Wed Pick September 15
11 16 Thu Pick September 16
10 17 Fri Pick September 17
13 18 Sat Pick September 18
8 19 Sun Pick September 19
5 20 Mon Pick September 20
6 21 Tue Pick September 21
5 22 Wed Pick September 22
9 23 Thu Pick September 23
2 24 Fri Pick September 24
5 25 Sat Pick September 25
2 26 Sun Pick September 26
2 27 Mon Pick September 27
6 28 Tue Pick September 28
5 29 Wed Pick September 29
8 30 Thu Pick September 30
9 Dates outside your trip are dimmed.
One row per year, one cell per day. 2009 had 3 rain days, 2025 had 21.
Nagasaki through the year What to pack Loose, light-colored clothes, sandals and a hat did most of the work at 29°C. Sights went in the morning, with a break in the middle of the day.
A packable rain jacket weighs almost nothing and covers 10 rain days. Leave the suede at home.
Common questions Does it rain a lot in Nagasaki in September? Over the past 20 years September averaged 10 rain days (1 mm or more) out of 30. Individual years ran from 3 in the driest to 21 in the wettest.
What should I wear in Nagasaki in September? Days averaged 29°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 Nagasaki? On warmth and rain days alone, Nagasaki's easiest months were May and October. September ranked 6 of 12.
Is Nagasaki humid in September? Mean relative humidity was 79%, with about 21 muggy days (dew point of 20°C or more) in the month.
Previous month Nagasaki in August Next month Nagasaki in October Whole year Nagasaki weather by month Where to go September By country Japan: all cities this month