January −1° · ☂ 23 February 0° · ☂ 19 March 5° · ☂ 15 April 11° · ☂ 9 May 18° · ☂ 9 ★ June21° · ☂ 8 ★ July25° · ☂ 8 August 27° · ☂ 11 ★ September23° · ☂ 10 October 16° · ☂ 14 November 8° · ☂ 18 December 1° · ☂ 22 Otaru in September:comfortably warm, rain on many days Otaru, Japan · Records from 2006 to 2025. Not a forecast.
Mean high 23° Hottest day 30.1° (2010)
Mean low 15° Coldest night 7.2° (2013)
Rain days 10 days 6-16 by year
Rainfall 123mm Daylight 13.2 → 11.8 h
Otaru's 12 months i Best: June, July and September
1 2 3 4 5 6 7 8 9 10 11 12
Trip types Sightseeing on foot Finemild
Humidity 77% 3 muggy days
Clear days 4 days 10 overcast days
Mean wind 13 km/h Rarely windy
Sunrise / sunset (15th) 05:15 / 17:48 Daylight 13.2 → 11.8 h
Otaru in September The summer peak is over and things quiet down. The sea wind starts to feel cold, so bring a jacket for the evenings. Midday is still warm enough for easy walking.
Afternoons reached 23°C and nights settled at 15°C, warm enough to linger over lunch outdoors. With 10 rain days on average, a wet day was rarely more than a few days away. Counts moved moderately between years: 6 in 2022, 16 in 2011.
Not every year was typical: 2012 ran 2.7°C warmer than the mean, with highs of 25.8°C.
Typhoons i 3 of the last 20 years had a tropical storm pass within 300 km this month.
Fitow (2007), 21 km away tropical storm Jebi (2018), 122 km away tropical storm Kompasu (2010), 148 km away tropical storm 1 2 3 4 5 6 7 3 8 3 9 1 10 11 12
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Wednesday 1 rain in 4 of 20 yrs 4/20 26° 17° September 2 Thursday 2 rain in 6 of 20 yrs 6/20 25° 17° September 3 Friday 3 rain in 6 of 20 yrs 6/20 25° 17° September 4 Saturday 4 rain in 6 of 20 yrs 6/20 25° 17° 1-4 rain on 28% of days 25° 17°
September 5 Sunday 5 rain in 10 of 20 yrs 10/20 25° 17° September 6 Monday 6 rain in 8 of 20 yrs 8/20 25° 17° September 7 Tuesday 7 rain in 10 of 20 yrs 10/20 25° 17° September 8 Wednesday 8 rain in 5 of 20 yrs 5/20 25° 16° September 9 Thursday 9 rain in 4 of 20 yrs 4/20 25° 16° September 10 Friday 10 rain in 7 of 20 yrs 7/20 24° 16° September 11 Saturday 11 rain in 6 of 20 yrs 6/20 24° 15° 5-11 rain on 36% of days 25° 16°
September 12 Sunday 12 rain in 8 of 20 yrs 8/20 24° 15° September 13 Monday 13 rain in 7 of 20 yrs 7/20 24° 15° September 14 Tuesday 14 rain in 7 of 20 yrs 7/20 23° 15° September 15 Wednesday 15 rain in 7 of 20 yrs 7/20 23° 15° September 16 Thursday 16 rain in 7 of 20 yrs 7/20 24° 15° September 17 Friday 17 rain in 8 of 20 yrs 8/20 23° 15° September 18 Saturday 18 rain in 10 of 20 yrs 10/20 23° 14° 12-18 rain on 39% of days 23° 15°
September 19 Sunday 19 rain in 7 of 20 yrs 7/20 22° 14° September 20 Monday 20 rain in 6 of 20 yrs 6/20 22° 13° September 21 Tuesday 21 rain in 7 of 20 yrs 7/20 22° 13° September 22 Wednesday 22 rain in 3 of 20 yrs 3/20 22° 13° September 23 Thursday 23 rain in 9 of 20 yrs 9/20 21° 12° September 24 Friday 24 rain in 5 of 20 yrs 5/20 22° 13° September 25 Saturday 25 rain in 5 of 20 yrs 5/20 21° 12° 19-25 rain on 30% of days 22° 13°
September 26 Sunday 26 rain in 5 of 20 yrs 5/20 21° 12° September 27 Monday 27 rain in 7 of 20 yrs 7/20 21° 12° September 28 Tuesday 28 rain in 10 of 20 yrs 10/20 21° 12° September 29 Wednesday 29 rain in 6 of 20 yrs 6/20 21° 12° September 30 Thursday 30 rain in 9 of 20 yrs 9/20 21° 12°
26-30 rain on 37% of days 21° 12°
1-4 rain on 28% of days 25° 17° 5-11 rain on 36% of days 25° 16° 12-18 rain on 39% of days 23° 15° 19-25 rain on 30% of days 22° 13° 26-30 rain on 37% of days 21° 12°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Friday 1 rain in 4 of 20 yrs 4/20 26° 17° September 2 Saturday 2 rain in 6 of 20 yrs 6/20 25° 17° 1-2 rain on 25% of days 25° 17°
September 3 Sunday 3 rain in 6 of 20 yrs 6/20 25° 17° September 4 Monday 4 rain in 6 of 20 yrs 6/20 25° 17° September 5 Tuesday 5 rain in 10 of 20 yrs 10/20 25° 17° September 6 Wednesday 6 rain in 8 of 20 yrs 8/20 25° 17° September 7 Thursday 7 rain in 10 of 20 yrs 10/20 25° 17° September 8 Friday 8 rain in 5 of 20 yrs 5/20 25° 16° September 9 Saturday 9 rain in 4 of 20 yrs 4/20 25° 16° 3-9 rain on 35% of days 25° 17°
September 10 Sunday 10 rain in 7 of 20 yrs 7/20 24° 16° September 11 Monday 11 rain in 6 of 20 yrs 6/20 24° 15° September 12 Tuesday 12 rain in 8 of 20 yrs 8/20 24° 15° September 13 Wednesday 13 rain in 7 of 20 yrs 7/20 24° 15° September 14 Thursday 14 rain in 7 of 20 yrs 7/20 23° 15° September 15 Friday 15 rain in 7 of 20 yrs 7/20 23° 15° September 16 Saturday 16 rain in 7 of 20 yrs 7/20 24° 15° 10-16 rain on 35% of days 24° 15°
September 17 Sunday 17 rain in 8 of 20 yrs 8/20 23° 15° September 18 Monday 18 rain in 10 of 20 yrs 10/20 23° 14° September 19 Tuesday 19 rain in 7 of 20 yrs 7/20 22° 14° September 20 Wednesday 20 rain in 6 of 20 yrs 6/20 22° 13° September 21 Thursday 21 rain in 7 of 20 yrs 7/20 22° 13° September 22 Friday 22 rain in 3 of 20 yrs 3/20 22° 13° September 23 Saturday 23 rain in 9 of 20 yrs 9/20 21° 12° 17-23 rain on 36% of days 22° 13°
September 24 Sunday 24 rain in 5 of 20 yrs 5/20 22° 13° September 25 Monday 25 rain in 5 of 20 yrs 5/20 21° 12° September 26 Tuesday 26 rain in 5 of 20 yrs 5/20 21° 12° September 27 Wednesday 27 rain in 7 of 20 yrs 7/20 21° 12° September 28 Thursday 28 rain in 10 of 20 yrs 10/20 21° 12° September 29 Friday 29 rain in 6 of 20 yrs 6/20 21° 12° September 30 Saturday 30 rain in 9 of 20 yrs 9/20 21° 12° 24-30 rain on 34% of days 21° 12°
1-2 rain on 25% of days 25° 17° 3-9 rain on 35% of days 25° 17° 10-16 rain on 35% of days 24° 15° 17-23 rain on 36% of days 22° 13° 24-30 rain on 34% of days 21° 12°
Tap another date to change
2006 19mm
2007 none
2008 none
2009 7mm
2010 1mm
2011 21mm
2012 none
2013 7mm
2014 6mm
2015 none
2016 none
2017 none
2018 22mm
2019 none
2020 2mm
2021 none
2022 2mm
2023 8mm
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 11° 18° 25° 32° 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 5 Sun Pick September 5
10 7 Tue Pick September 7
10 10 Fri Pick September 10
7 11 Sat Pick September 11
6 12 Sun Pick September 12
8 13 Mon Pick September 13
7 14 Tue Pick September 14
7 15 Wed Pick September 15
7 16 Thu Pick September 16
7 17 Fri Pick September 17
8 18 Sat Pick September 18
10 19 Sun Pick September 19
7 20 Mon Pick September 20
6 21 Tue Pick September 21
7 22 Wed Pick September 22
3 23 Thu Pick September 23
9 24 Fri Pick September 24
5 25 Sat Pick September 25
5 26 Sun Pick September 26
5 27 Mon Pick September 27
7 28 Tue Pick September 28
10 29 Wed Pick September 29
6 30 Thu Pick September 30
9 Dates outside your trip are dimmed.
One row per year, one cell per day. 2022 had 6 rain days, 2011 had 16.
Common questions Does it rain a lot in Otaru in September? Over the past 20 years September averaged 10 rain days (1 mm or more) out of 30. Individual years ran from 6 in the driest to 16 in the wettest.
What should I wear in Otaru in September? Days averaged 23°C and nights 15°C. Pack a compact umbrella, a waterproof jacket, a light layer for the evenings, and T-shirts.
Is September a good time to visit Otaru? On warmth and rain days alone, Otaru's easiest months were June, July and September. September ranked 2 of 12, close to the top.
How many clear days does Otaru get in September? About 4 clear days (under 30% cloud on average) and 10 overcast days (80% or more).
Previous month Otaru in August Next month Otaru in October Whole year Otaru weather by month Where to go September By country Japan: all cities this month