★ January33° · ☂ 2 ★ February34° · ☂ 3 March 35° · ☂ 3 April 36° · ☂ 6 May 35° · ☂ 12 June 34° · ☂ 13 July 34° · ☂ 15 August 33° · ☂ 15 September 33° · ☂ 18 October 33° · ☂ 14 November 33° · ☂ 5 ★ December32° · ☂ 1 Bangkok in September:seriously hot, Bangkok, Thailand · Records from 2006 to 2025. Not a forecast.
Mean high 33° Hottest day 37.6° (2006)
Mean low 25° Coldest night 22.9° (2007)
Rain days 18 days 11-24 by year
Rainfall 385mm Daylight 12.4 → 12.0 h
Bangkok's 12 months i Best: December to February
1 2 3 4 5 6 7 8 9 10 11 12
Trip types Sightseeing on foot Poorhot, frequent rain and muggy
Humidity 80% 30 muggy days
Clear days 0 days 24 overcast days
Mean wind 8 km/h Rarely windy
Sunrise / sunset (15th) 06:07 / 18:20 Daylight 12.4 → 12.0 h
Bangkok in September The rainiest month in Bangkok. When heavy rain drags on, water collects in alleys with weak drainage. Sandals or slippers are easiest, and for important appointments leave extra travel time.
Days averaged 33°C and nights 25°C. Midday was for air conditioning, a cold drink or a long lunch out of the sun. The month averaged 18 rain days. Carry an umbrella. It varied a lot from year to year. September 2015 had 11 rain days; 2023 had 24.
29 days past 30°C made it a month for early starts and a long lunch indoors. Rain days averaged 21 mm each, so when it rained it rained properly.
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Wednesday 1 rain in 11 of 20 yrs 11/20 34° 26° September 2 Thursday 2 rain in 12 of 20 yrs 12/20 33° 26° September 3 Friday 3 rain in 10 of 20 yrs 10/20 34° 26° September 4 Saturday 4 rain in 13 of 20 yrs 13/20 34° 26° 1-4 rain on 58% of days 34° 26°
September 5 Sunday 5 rain in 7 of 20 yrs 7/20 34° 26° September 6 Monday 6 rain in 9 of 20 yrs 9/20 34° 26° September 7 Tuesday 7 rain in 12 of 20 yrs 12/20 33° 26° September 8 Wednesday 8 rain in 12 of 20 yrs 12/20 33° 26° September 9 Thursday 9 rain in 11 of 20 yrs 11/20 34° 26° September 10 Friday 10 rain in 15 of 20 yrs 15/20 33° 26° September 11 Saturday 11 rain in 14 of 20 yrs 14/20 33° 25° 5-11 rain on 57% of days 33° 26°
September 12 Sunday 12 rain in 11 of 20 yrs 11/20 33° 26° September 13 Monday 13 rain in 12 of 20 yrs 12/20 33° 26° September 14 Tuesday 14 rain in 17 of 20 yrs 17/20 33° 25° September 15 Wednesday 15 rain in 18 of 20 yrs 18/20 33° 25° September 16 Thursday 16 rain in 16 of 20 yrs 16/20 33° 25° September 17 Friday 17 rain in 12 of 20 yrs 12/20 33° 25° September 18 Saturday 18 rain in 13 of 20 yrs 13/20 33° 25° 12-18 rain on 71% of days 33° 25°
September 19 Sunday 19 rain in 12 of 20 yrs 12/20 33° 25° September 20 Monday 20 rain in 12 of 20 yrs 12/20 32° 25° September 21 Tuesday 21 rain in 13 of 20 yrs 13/20 33° 25° September 22 Wednesday 22 rain in 10 of 20 yrs 10/20 33° 25° September 23 Thursday 23 rain in 15 of 20 yrs 15/20 32° 25° September 24 Friday 24 rain in 12 of 20 yrs 12/20 33° 25° September 25 Saturday 25 rain in 10 of 20 yrs 10/20 33° 25° 19-25 rain on 60% of days 33° 25°
September 26 Sunday 26 rain in 11 of 20 yrs 11/20 33° 25° September 27 Monday 27 rain in 11 of 20 yrs 11/20 33° 25° September 28 Tuesday 28 rain in 12 of 20 yrs 12/20 33° 25° September 29 Wednesday 29 rain in 12 of 20 yrs 12/20 33° 25° September 30 Thursday 30 rain in 8 of 20 yrs 8/20 33° 25°
26-30 rain on 54% of days 33° 25°
1-4 rain on 58% of days 34° 26° 5-11 rain on 57% of days 33° 26° 12-18 rain on 71% of days 33° 25° 19-25 rain on 60% of days 33° 25° 26-30 rain on 54% of days 33° 25°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Friday 1 rain in 11 of 20 yrs 11/20 34° 26° September 2 Saturday 2 rain in 12 of 20 yrs 12/20 33° 26° 1-2 rain on 58% of days 34° 26°
September 3 Sunday 3 rain in 10 of 20 yrs 10/20 34° 26° September 4 Monday 4 rain in 13 of 20 yrs 13/20 34° 26° September 5 Tuesday 5 rain in 7 of 20 yrs 7/20 34° 26° September 6 Wednesday 6 rain in 9 of 20 yrs 9/20 34° 26° September 7 Thursday 7 rain in 12 of 20 yrs 12/20 33° 26° September 8 Friday 8 rain in 12 of 20 yrs 12/20 33° 26° September 9 Saturday 9 rain in 11 of 20 yrs 11/20 34° 26° 3-9 rain on 53% of days 34° 26°
September 10 Sunday 10 rain in 15 of 20 yrs 15/20 33° 26° September 11 Monday 11 rain in 14 of 20 yrs 14/20 33° 25° September 12 Tuesday 12 rain in 11 of 20 yrs 11/20 33° 26° September 13 Wednesday 13 rain in 12 of 20 yrs 12/20 33° 26° September 14 Thursday 14 rain in 17 of 20 yrs 17/20 33° 25° September 15 Friday 15 rain in 18 of 20 yrs 18/20 33° 25° September 16 Saturday 16 rain in 16 of 20 yrs 16/20 33° 25° 10-16 rain on 74% of days 33° 25°
September 17 Sunday 17 rain in 12 of 20 yrs 12/20 33° 25° September 18 Monday 18 rain in 13 of 20 yrs 13/20 33° 25° September 19 Tuesday 19 rain in 12 of 20 yrs 12/20 33° 25° September 20 Wednesday 20 rain in 12 of 20 yrs 12/20 32° 25° September 21 Thursday 21 rain in 13 of 20 yrs 13/20 33° 25° September 22 Friday 22 rain in 10 of 20 yrs 10/20 33° 25° September 23 Saturday 23 rain in 15 of 20 yrs 15/20 32° 25° 17-23 rain on 62% of days 33° 25°
September 24 Sunday 24 rain in 12 of 20 yrs 12/20 33° 25° September 25 Monday 25 rain in 10 of 20 yrs 10/20 33° 25° September 26 Tuesday 26 rain in 11 of 20 yrs 11/20 33° 25° September 27 Wednesday 27 rain in 11 of 20 yrs 11/20 33° 25° September 28 Thursday 28 rain in 12 of 20 yrs 12/20 33° 25° September 29 Friday 29 rain in 12 of 20 yrs 12/20 33° 25° September 30 Saturday 30 rain in 8 of 20 yrs 8/20 33° 25° 24-30 rain on 54% of days 33° 25°
1-2 rain on 58% of days 34° 26° 3-9 rain on 53% of days 34° 26° 10-16 rain on 74% of days 33° 25° 17-23 rain on 62% of days 33° 25° 24-30 rain on 54% of days 33° 25°
Tap another date to change
2006 16mm
2007 12mm
2008 8mm
2009 10mm
2010 2mm
2011 6mm
2012 11mm
2013 none
2014 36mm
2015 21mm
2016 none
2017 14mm
2018 17mm
2019 7mm
2020 2mm
2021 5mm
2022 4mm
2023 22mm
2024 1mm
2025 5mm
Holidays in September (2027) 1 US holidays (flights fill up)
Holidays in September (2028)
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 1 Wed Pick September 1
11 2 Thu Pick September 2
12 3 Fri Pick September 3
10 4 Sat Pick September 4
13 7 Tue Pick September 7
12 8 Wed Pick September 8
12 9 Thu Pick September 9
11 10 Fri Pick September 10
15 11 Sat Pick September 11
14 12 Sun Pick September 12
11 13 Mon Pick September 13
12 14 Tue Pick September 14
17 15 Wed Pick September 15
18 16 Thu Pick September 16
16 17 Fri Pick September 17
12 18 Sat Pick September 18
13 19 Sun Pick September 19
12 20 Mon Pick September 20
12 21 Tue Pick September 21
13 22 Wed Pick September 22
10 23 Thu Pick September 23
15 24 Fri Pick September 24
12 25 Sat Pick September 25
10 26 Sun Pick September 26
11 27 Mon Pick September 27
11 28 Tue Pick September 28
12 29 Wed Pick September 29
12 30 Thu Pick September 30
8 Dates outside your trip are dimmed.
One row per year, one cell per day. 2015 had 11 rain days, 2023 had 24.
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.
Wet pavements were the norm: shoes you do not mind soaking, a jacket with a real hood, and a plastic bag to keep your phone and passport dry.
Common questions Does it rain a lot in Bangkok in September? Over the past 20 years September averaged 18 rain days (1 mm or more) out of 30. Individual years ran from 11 in the driest to 24 in the wettest.
What should I wear in Bangkok in September? Days averaged 33°C and nights 25°C. Pack an umbrella, sandals that can get wet, T-shirts, sunscreen plus a hat, and insect repellent.
Is September a good time to visit Bangkok? On warmth and rain days alone, Bangkok's easiest months were December to February. September ranked 9 of 12.
Is Bangkok humid in September? Mean relative humidity was 80%, with about 30 muggy days (dew point of 20°C or more) in the month.
Previous month Bangkok in August Next month Bangkok in October Whole year Bangkok weather by month Where to go September By country Thailand: all cities this month Compare Compare with Phuket Compare Compare with Chiang Mai