yearsofweather

Singapore in September:
very hot, rain on many days

Singapore · Records from 2006 to 2025. Not a forecast.

Mean high32°Hottest day 34.1° (2016)
Mean low25°Coldest night 23.4° (2009)
Rain days10 days3-18 by year
Rainfall148mmDaylight 12.1 → 12.1 h
Singapore's 12 months iBest: February
Trip types Beach Goodwarm seaSightseeing on foot Poorhot and muggy
Humidity85%30 muggy days
Clear days0 days19 overcast days
Mean wind8 km/hRarely windy
Sea temperature29.6°29.3-30.1° by year (last 6)
Sunrise / sunset (15th)06:56 / 19:04Daylight 12.1 → 12.1 h

Singapore in September

This is when haze risk is highest. In years when winds bring smoke from fires, the sky turns murky and outdoor activity should be cut back. It varies, and some years see none. Rainy days are fewer than in most months.

It was a hot month: 32°C by day and 25°C after dark. Rain fell on 10 days of the month on average. Averages hide a lot here: one year saw 3, another 18.

27 days past 30°C made it a month for early starts and a long lunch indoors.

Date by date i

‹ August September 2027 October ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-4rain on 35% of days32° 25°
5-11rain on 36% of days31° 25°
12-18rain on 27% of days32° 25°
19-25rain on 36% of days32° 25°
26-30rain on 33% of days32° 25°

0-5/206-8/209-11/2012-20/20

1-4rain on 35% of days32° 25°
5-11rain on 36% of days31° 25°
12-18rain on 27% of days32° 25°
19-25rain on 36% of days32° 25°
26-30rain on 33% of days32° 25°
Tap another date to change

200611mm
20075mm
2008none
2009none
201021mm
2011none
20127mm
2013none
201412mm
2015none
20167mm
2017none
2018none
201974mm
202011mm
202130mm
2022none
2023none
20243mm
2025none
Holidays in September (2027)
  • September 6 Labor Day

1 US holidays (flights fill up)

Your trip dates, the past 20 years

Trip dates ~

You can also click two dates on the axis. Hover a cell to see that day's rain.
Trip rain days Month rain days
2006
4 d 9 d
2007
2 d 9 d
2008
3 d 9 d
2009
1 d 8 d
2010
2 d 16 d
2011
2 d 11 d
2012
2 d 6 d
2013
6 d 15 d
2014
0 d 3 d
2015
0 d 3 d
2016
2 d 11 d
2017
3 d 13 d
2018
4 d 9 d
2019
0 d 7 d
2020
5 d 18 d
2021
3 d 14 d
2022
3 d 8 d
2023
3 d 10 d
2024
2 d 8 d
2025
3 d 12 d
Years with rain
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
7
9
5
7
6
7
7
8
9
7
6
4
3
4
8
7
6
6
7
7
9
4
5
8
10
6
7
7
6
7
Rain days on trip
42312226002340533323

No rain1-9 mm10 mm or more Dates outside your trip are dimmed.

One row per year, one cell per day. 2014 had 3 rain days, 2020 had 18.

Singapore through the year

MonthHighLowRain daysRainfallSea
January 31°24°11 days278mm 28°
FebruaryGood 32°25°6 days90mm 28°
March 32°25°10 days191mm 29°
April 32°25°12 days205mm 30°
May 32°26°13 days189mm 31°
June 32°26°12 days166mm 31°
July 32°26°10 days145mm 30°
August 31°25°12 days191mm 30°
September 32°25°10 days148mm 30°
October 32°25°12 days190mm 30°
November 31°25°16 days307mm 30°
December 31°24°17 days325mm 29°

Common questions

Does it rain a lot in Singapore 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 18 in the wettest.

What should I wear in Singapore in September?

Days averaged 32°C and nights 25°C. Pack a compact umbrella, T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.

Can you swim in Singapore in September?

Sea surface temperature averaged 29.6°C in September, warm enough to stay in for a long swim. Year to year it ranged 29.3-30.1°C. Check local flags for waves and jellyfish on the day.

Is September a good time to visit Singapore?

On warmth and rain days alone, Singapore's easiest month was February. September ranked 3 of 12, close to the top.

Is Singapore humid in September?

Mean relative humidity was 85%, with about 30 muggy days (dew point of 20°C or more) in the month.