yearsofweather

Sydney in September:
warm,

Sydney, Australia · Records from 2006 to 2025. Not a forecast.

Mean high22°Hottest day 35.2° (2023)
Mean low12°Coldest night 5.4° (2012)
Rain days7 days1-15 by year
Rainfall68mmDaylight 11.4 → 12.4 h
Sydney's 12 months iBest: September to November
Trip types Beach Poorcool seaSightseeing on foot Goodmild
Sea temperature18.7°17.9-19.8° by year (last 6)
Sunrise / sunset (15th)05:55 / 17:46Daylight 11.4 → 12.4 h

Sydney in September

Spring starts officially on September 1. The sea is at its coldest and rainy days are among the fewest of the year. Flowers start to bloom, which suits a walk in the Botanic Garden, and a sudden hot spell can happen.

Highs of 22°C and lows of 12°C: short sleeves by day, with cool nights. 7 rain days in a typical September: noticeable, but most days stayed dry. Averages hide a lot here: one year saw 1, another 15.

Highs passed 30°C on 2 days on average. September 2013 averaged 24.6°C by day, 2.5°C above the 20-year mean.

Date by date i

‹ August September 2027 October ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-4rain on 28% of days21° 11°
5-11rain on 26% of days21° 12°
12-18rain on 19% of days23° 12°
19-25rain on 19% of days23° 13°
26-30rain on 21% of days23° 13°

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

1-4rain on 28% of days21° 11°
5-11rain on 26% of days21° 12°
12-18rain on 19% of days23° 12°
19-25rain on 19% of days23° 13°
26-30rain on 21% of days23° 13°
Tap another date to change

2006none
2007none
20085mm
20095mm
20101mm
2011none
2012none
2013none
20144mm
201512mm
20162mm
2017none
201814mm
2019none
2020none
2021none
202214mm
2023none
2024none
2025none
Holidays in September (2027)
  • September 6 Labor Day

1 US holidays (flights fill up)

Day by day temperature i

9°18°28°37° 1815222930

Mean high Mean low Coldest to warmest high in 20 years

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
5 d 6 d
2007
3 d 5 d
2008
2 d 5 d
2009
2 d 5 d
2010
3 d 7 d
2011
2 d 8 d
2012
0 d 6 d
2013
1 d 6 d
2014
4 d 7 d
2015
1 d 7 d
2016
1 d 11 d
2017
0 d 1 d
2018
3 d 9 d
2019
0 d 3 d
2020
1 d 6 d
2021
1 d 9 d
2022
2 d 15 d
2023
1 d 4 d
2024
0 d 6 d
2025
4 d 6 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
3
3
8
8
4
8
6
6
5
5
2
2
5
6
3
2
4
5
4
3
3
4
2
3
7
4
3
4
6
4
Rain days on trip
53223201411030112104

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

One row per year, one cell per day. 2017 had 1 rain day, 2022 had 15.

Sydney through the year

MonthHighLowRain daysRainfallSea
January 27°20°10 days98mm 24°
February 28°20°10 days137mm 24°
March 26°19°12 days179mm 24°
April 24°15°10 days145mm 23°
May 21°13°8 days99mm 21°
June 18°10°10 days155mm 20°
July 18°9°8 days104mm 18°
August 20°10°7 days85mm 18°
SeptemberGood 22°12°7 days68mm 19°
OctoberGood 24°15°9 days69mm 20°
NovemberGood 25°17°10 days94mm 20°
December 27°18°9 days79mm 22°

Common questions

Does it rain a lot in Sydney in September?

Over the past 20 years September averaged 7 rain days (1 mm or more) out of 30. Individual years ran from 1 in the driest to 15 in the wettest.

What should I wear in Sydney in September?

Days averaged 22°C and nights 12°C. Pack a compact umbrella, a light layer for the evenings, and T-shirts.

Can you swim in Sydney in September?

Sea surface temperature averaged 18.7°C in September, more for a paddle than a swim. Year to year it ranged 17.9-19.8°C. Check local flags for waves and jellyfish on the day.

Is September a good time to visit Sydney?

On warmth and rain days alone, Sydney's easiest months were September to November. September ranked 2 of 12, close to the top.