Sydney in September 2012: Dry, warm, sunny start to Spring

  • Eighth warmest September on record for maximum temperatures
  • 6th warmest September day on record
  • Coldest September night since 1995
  • Sunniest September since 1987.

Rainfall - Driest September since 2009

Sydney Observatory Hill recorded just 23.8 mm of rain during September, well below the historical average of 68.9 mm and the driest September since 16 mm fell during 2009, with dry conditions across the city. Only three days during the month recorded more than 1 mm (average 7 days), with only one day reaching 5 mm, the fewest since 2003 (0 days).

There were only two significant rain events during the month. On the 18th, widespread thunderstorms across the city produced only 3.6 mm at Observatory Hill, but 24 hour totals to 9am on the 19th reached 23 mm at Glenorie in northwest Sydney. Thunderstorms were also widespread across the city overnight on the 28th, with 24 hour totals to 9am on the 29th reaching 13.2 mm at Observatory Hill and 21 mm at Turramurra in northern Sydney.

Temperature - Warm days across the city, cool nights in the west

The average maximum temperature at Sydney Observatory Hill during September was 22.5 °C, 2.5 °C above the historical average and the 8th warmest September on record, with temperatures well above average across the city. Temperatures were warm throughout the month, with only three days dropping below 20 °C, the fewest on record for September (previous record 5 cool days in 2009 and 1980). However, only three days reached 25 °C, normal for September, with the majority of days recording mild temperatures between 20 and 23 °C.

Temperatures were particularly warm at the start of the month, with eleven days above 21 °C between the 3rd and 13th, the earliest such spell on record for Sydney, reaching 27 °C on the 5th and 6th. Temperatures were also very warm on the 28th, reaching 34.1 °C at Sydney Airport and 34.4 °C at Liverpool. Temperatures at Sydney Observatory Hill reached 33.2 °C, its 6th warmest September day on record.

Sydney Observatory Hill recorded an average minimum temperature of 12 °C, 0.9 °C above the historical average but the coolest September since 2004. Nights were generally cooler than normal in western Sydney, including the coldest September since 1994 at Richmond and Parramatta.

Nights were very cold at the start of the month, with a minimum temperature of 5.5 °C at Sydney Observatory Hill on the 1st, the coldest September night since 5.2 °C on 6 September 1995. This was the coldest September night on record at Camden, Parramatta, Richmond and Prospect Reservoir. In contrast, Sydney Observatory Hill recorded 18.4 °C on the 6th and 18.9 °C on the 28th; only eight other years have recorded two nights above 18 °C in September.

See a list of September temperature records.

Other phenomena - Sunniest September since 1987

The prevailing wind direction at Sydney Airport during September was easterly, with 63% of 3pm winds between NE and SE. There were six strong wind days, normal for September, with a maximum wind gust of 80 km/hr on the 7th and some damage around the city.

The airport recorded an average of 9.2 hours of bright sunshine, well above the historical average of 7.9 hours and the sunniest September since 1987 (9.4 hours). Four days had thunderstorm activity in the Sydney region, with reports of small hail on the 18th.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in September 2012
Hottest day 34.4 °C at Liverpool (Michael Wenden Centre) on the 28th
Warmest days on average 24.3 °C at Liverpool (Michael Wenden Centre)
Coolest days on average 21.3 °C at Terrey Hills AWS
Coldest day 15.1 °C at Terrey Hills AWS on the 1st
Coldest night -1.8 °C at Camden Airport AWS on the 1st
Coolest nights on average 5.3 °C at Camden Airport AWS
Warmest nights on average 12.0 °C at Sydney (Observatory Hill)
Warmest night 18.9 °C at Sydney (Observatory Hill) on the 28th
Warmest on average overall 17.2 °C at Sydney (Observatory Hill)
17.2 °C at Sydney Airport AMO
Coolest on average overall 14.3 °C at Camden Airport AWS
Wettest overall 47.2 mm at Glenorie (Old Northern Rd)
Wettest day 23.0 mm at Glenorie (Old Northern Rd) on the 19th
Highest wind gust 87 km/h at Kurnell AWS on the 7th


Record lowest September temperature
Lowest temperature
in September 2012 (°C)
Previous coolest
for September
Years of
record
Average for
September
Prospect Reservoir 1.7 on the 1st 2.6 on the 22nd in 1994 47 9.4
Parramatta North (Masons Drive) 0.7 on the 1st 1.4 on the 7th in 1995 45 9.3
Camden Airport AWS -1.8 on the 1st -1.0 on the 14th in 1972 36 6.8

Summary statistics for September 2012
Maximum temperatures
for September
(°C)
Minimum temperatures
for September
(°C)
Rainfall
for September
(millimetres)
Mean for
September
2012
Diff
from
average
Highest for
September
2012
Mean for
September
2012
Diff
from
average
Lowest for
September
2012
Total for
September
2012
Average
for
September
Rank of
September
2012
Fraction of
September
average
Badgerys Creek AWS 23.7   33.4 28th 6.1   -0.2 1st 14.8
Bankstown Airport AWS 23.4 +1.9 33.6 28th 7.9 -0.8 2.7 1st 20.4 44.6 average 46%
Camden Airport AWS 23.4 +1.5 33.9 28th 5.3 -1.5 -1.8 1st 21.8 39.6 average 55%
Campbelltown (Mount Annan) 23.2   32.9 28th 6.0   0.6 3rd 23.6
Canterbury Racecourse AWS 22.2   32.3 28th 8.2   2.7 1st 20.6
Holsworthy Aerodrome AWS 23.0   33.4 28th 7.8   2.2 1st 22.4
Holsworthy Control Range 22.8   33.3 28th 6.9   0.8 1st 22.0
Horsley Park Equestrian Centre AWS 23.2   33.0 28th 7.9   2.4 1st 19.4
Liverpool (Michael Wenden Centre) 24.3   34.4 28th 6.7   1.9 3rd 20.5
Parramatta North (Masons Drive) 23.0 +1.4 33.2 28th 8.6 -0.7 0.7 1st 26.6 53.9 average 49%
Penrith Lakes AWS 24.2   34.1 28th 7.8   2.2 1st 24.4
Prospect Reservoir 23.6 +2.3 33.4 28th 8.7 -0.7 1.7 1st 21.0 46.9 low 45%
Richmond RAAF 24.1   33.7 28th 6.0   -1.4 1st 32.6
Riverview Observatory 22.6 +1.9 32.1 28th 8.6 -0.8 3.3 1st 24.3 62.0 low 39%
Springwood (Valley Heights) 22.2   32.0 28th 9.1   3.2 1st 25.0 55.6 average 45%
Sydney (Observatory Hill) 22.5 +2.5 33.2 28th 12.0 +0.9 5.5 1st 23.8 68.6 low 35%
Sydney Airport AMO 22.6 +2.1 34.1 28th 11.9 +1.5 5.1 1st 20.0 60.3 low 33%
Terrey Hills AWS 21.3   31.4 28th 10.6   4.2 1st 30.2

Daily rainfall
Hunter (61)123456789101112131415161718192021222324252627282930
Webbs Ck-Wisemans Ferry (Hawkesbury Rive 0.6 0.2 - - - - - - - - - - - 0.4 0.2 - - 5.0 10.4 0.2 - - - - - - 21.6 - 9.2 -
Central Tablelands (South) (63)123456789101112131415161718192021222324252627282930
Springwood (Valley Heights) 1.2 - - - - 1.0 - - - - - - - 0.6 - - - 6.4 8.2 - - - - - - - - - 7.6 -
Metropolitan (East) (66)123456789101112131415161718192021222324252627282930
Abbotsford (Blackwall Point Rd)

















4.5

1.0




»» 14.0
Auburn (Rosnay Golf Club) - - - - - - - - - - - - - 1.0 - - - 1.0 2.0 1.0 - - - - - - - - 12.0 -
Audley (Royal National Park) - - - - - - - - - - - - - 3.0 - - - 1.0 - - - 1.0 - - - - - - 14.0 -
Avalon (Wollstonecraft Ave) 2.0 1.0 - - - - - - - - - - - 1.0 - - - 5.0 4.0 - - - - - - - - - 5.0 -
Avalon Beach (Avalon (Palmgrove Rd))
















5.2











Bankstown Airport AWS 1.2 - - - - - - - - - - - - 2.0 - - - - 1.2 - - 0.4 - - - - - - 15.6 -
Belrose (Evelyn Place) 0.6 0.8










3.4


1.8 6.8




0.2


14.6 -
Campbelltown (Ingleburn (Long Point)) 2.0 - - - - - - - - - - - - 4.0 - 1.0 - - 1.0 - - - - - - - - - 17.0 -
Canterbury Racecourse AWS 0.6 - - 0.4 - - - - - - - - - 1.8 - 0.2 - - 3.2 - - 0.8 - - - - - - 13.6 -
Castle Cove (Rosebridge Ave) 1.0 0.5










5.0


1.5 6.0








18.0
Chatswood Bowling Club - - - - - - - - - - - - - 4.0 - - - - 5.0 - - - - - - - - - 16.0 -
Collaroy (Long Reef Golf Club)












2.2


1.0 10.6




2.2


7.0
Concord Golf Club












2.4



3.4










Cronulla South Bowling Club 2.6











6.0



0.2

1.4





13.0
Guildford (Woodville Golf Club) - - - - - - - - - - - - - 1.0 - - - 1.0 3.0 - - - - - - - - - 12.0 -
Holsworthy Aerodrome AWS 0.8 0.2 - - - - - - - - - - - 3.4 - - - 0.4 2.2 0.2 - 0.6 - - - - - - 14.6 -
Holsworthy Control Range 4.0 - - - - - - - - - - 0.2 - 2.8 0.2 - - 0.2 1.2 - - 0.2 - - - - - - 13.2 -
Lidcombe (Carnarvon Golf Club) - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13.0 -
Liverpool-Scrivener St (Georges River) - - - - - - - - - - - - - 1.0 - - - - - - - - - - - - - - 15.0 -
Lucas Heights (ANSTO)












3.6


1.3











Macquarie Park (Willandra Village)













0.2

0.4 6.2








16.4
Manley / Warringah (Allambie) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Marrickville Golf Club - - - - - - - - - - - - - 2.0 - - - - 4.0 - - - - - - - - - 14.0 -
Mona Vale Golf Club 0.6 1.0 0.2 0.2 - - - - - 0.2 - - 0.4 1.6 - - - 1.8 6.2 - 0.4 - 0.2 - 1.2 0.6 - - 7.6 -
Parramatta (Erts) - - - - - - - - - - - - - 2.0 - - - - 3.0 - - - - - - - - - 12.5 -
Parramatta North (Masons Drive) - - - - - - - - - - - - - 3.4 - - - 0.4 4.6 - 0.4 - - - - - - - 17.8 -
Peakhurst Golf Club - - - - - - - - - - - - - 1.0 - - - - - - - 1.0 - - - - - - 13.0 -
Randwick Bowling Club 0.8 2.0










4.8



3.4

1.0

1.2 0.8

12.4 -
Riverview Observatory 1.0 - 0.2 - - - - - - - - - - 4.2 - - - 0.4 4.4 »» 0.3 0.4 - - - - - - 13.4 -
Rose Bay (Royal Sydney Golf Club) 0.4











5.0


0.2 4.6

1.4

4.0 1.0



Sans Souci (Public School) - - - - - - - - - - - - - 2.0 - - - - 1.0 - - 1.0 - - - - - - 12.0 -
St Ives (Richmond Avenue) 1.0 0.4










5.0



10.0








13.4
Strathfield Golf Club 1.0 1.0 - 1.0 - - - - - 1.0 - - 1.0 2.0 - 1.0 - 1.0 4.0 1.0 - - 1.0 - - 1.0 2.0 - 15.0 -
Sydney (Observatory Hill) 0.4 0.8 - 0.2 - - - - - - - - - 3.8 - - - - 3.6 0.2 - 0.8 - - 0.2 0.4 0.2 - 13.2 -
Sydney Airport AMO 0.6 0.8 - - - - - - - - - - - 2.0 - - - - 2.8 0.2 - 1.4 - - 0.4 0.2 - - 11.6 -
Terrey Hills AWS 0.8 0.8 -
- - - - - - - - - 2.8 - - -
15.6 - 0.2 - - - - - - - 10.0 -
Turramurra (Kissing Point Road) 0.4











6.2


1.6 6.0








21.0 -
Metropolitan (West) (67)123456789101112131415161718192021222324252627282930
Abbotsbury (Fairfield City Farm) - - - - - - - - - - - - - 2.0 - - - - 1.0 - - - - - - - - - 15.0 -
Badgerys Creek AWS - - - - - - - - - - - - - 2.6 - - - 0.6 2.0 - - - - - - 0.2 - - 9.4 -
Baulkham Hills (Swimming Pool ) - - - - - - - - - - - - - 1.5 - - - - 6.0 - - - - - - - - - 15.5 -
Baulkham Hills Eucalyptus Ct - - - - - - - - - - - - - 2.0 - - - - 4.5 - - - - - - - - - 17.5 -
Berowra (Goodwyn Road)
















5.0 17.6








6.2
Blacktown (Dog Pound) - - - - - - - - - - - - - 3.0 - - - 1.0 1.5 - - - - - - - - - 12.5 -
Box Hill (Hynds Road) 1.0 - -
- - - - - - - - - - - - - 2.0 8.0 - - - - - - - - - 15.0 -
Castle Hill (Kathleen Ave) 1.4











2.4


1.0 6.2
0.2






18.5
Glenorie (Old Northern Rd) 4.0











1.2


4.0 23.0








15.0
Greystanes (Cumberland Golf Club) - - - - - - - - - - - - - 2.0 - - - 0.5 2.0 - - - - - - - - - 13.0 -
Horsley Park Equestrian Centre AWS 0.2 - - - - - - - - - - - - 1.6 - - - - 1.0 - - - - - - 0.2 - - 16.4 -
Kelso Ck (Kelso Creek U/S Levee (Georges 2.5 - - - - - - - - - - - - 2.5 - - - - 1.0 - - 0.5 - - - - - - 15.0 -
Kings Langley (NSW Soccer Federation) 1.5 - - - - - - - - - - - - 1.5 - - - 0.5 5.0 - - - - - - - - - 17.0 -
Liverpool (Michael Wenden Centre) 1.2 - - - - - - - - - - - - 3.9 - - - 0.6 0.6 - - - - - - - - - 14.2 -
Lower Portland (Hawkesbury River) 0.4 - - - - - - - - - - - - 0.8 - - - 0.4 - 0.2 - 0.2 - - - - - - - -
Maroota (Tobruk) 1.0 - - - - - - - - - - - - 0.4 - - - 4.4 18.4 - 0.2 - 0.2 - - - 0.2 - 11.4 -
Merrylands West (Finlayson Creek) - - - - - - - - - - - - - 2.0 - - - 0.5 1.5 - - - - - - - - - 13.5 -
North Parramatta (Burnside Homes) - - - - - - - - - - - - - 4.0 - - - - 4.0 - - 0.5 - - - - - - 18.5 -
North Rocks (Muirfield Golf Club) - - - - - - - - - - - - - 3.0 - - - 0.5 4.5 - - - - - - - - - 15.5 -
Northmead Bowling Club - - 0.5 - - - - - - 0.5 - - - 3.5 - - - 0.5 3.0 - - - - 0.5 - - - - 15.0 -
Penrith Lakes AWS 1.8 - - - - 0.2 - - - - - - 0.2 0.2 - - - 7.0 5.4 - - - - - - - - - 9.4 0.2
Prospect Reservoir 0.2 - - - - - - - - - - - - 2.8 - - - 0.8 2.0 - 0.2 - - - - - - - 15.0 -
Richmond RAAF 1.0 0.2 - - - - - - - - - - - - - - - 3.2 18.6 0.2 - - - - - - - - 9.4 -
Sackville 1.2 - - 0.2 - - - - - - - - - 1.6 - - - 2.2 7.0 - 0.2 - - - - - - - 10.8 -
Seven Hills (Radio FM 103.2) - - - - - - - - - - - - - 2.0 - - - 1.0 2.5 - - - - - - - - - 13.0 -
Seven Hills (Collins St)












1.2


1.6 4.0








16.8
South Creek (Elizabeth Drive)
















0.5 1.0








5.5
St Clair (Juba Close) - - - - - - - - - - - - - 1.0 - - - 2.0 1.0 - - - - - - - - - 7.0 -
Toongabbie Bowling Club - - - - - - - - - - - - - 2.5 - - - 1.0 3.0 - - 0.5 - - - - - - 15.0 -
Toongabbie Ck (Redbank Road (Toongabbee - - - - - - - - - - - - - 3.0 - - - - 3.5 - - - - - - - - - 16.0 -
West Pennant Hills (Cumberland S F Alert - - 0.5 - - - - - - - - - - 3.0 - - - 0.5 4.5 - - - - - - - - - 17.0 0.5
Willmot (Resolution Ave) 1.0 - - - - - - - - - - - - - - - - 2.0 2.0 - - - - - - - - - 12.0 -
Windsor SWC (Hawkesbury River) - - - - - - - - - - - - - - - - - 3.0 10.0 - - - - - - - - - 12.0 -
Illawarra (68)123456789101112131415161718192021222324252627282930
Camden Airport AWS 0.8 - - - - 0.2 - - - - - - 0.2 3.6 - - - 12.4 0.4 - 0.2 - - - - - - 0.2 3.8 -
Campbelltown (Kentlyn (Georges River Roa 1.0 - - - - - - - - - - - - 3.0 - - - 6.0 1.0 - - - - - - - - - 14.0 -
Campbelltown (Mount Annan) 1.4 - - - - - - - - - - - - 5.4 - - - 6.0 0.2 - 0.4 - - - - - - 0.6 9.4 0.2
Rossmore (South Creek) - - - - - - - - - - - - - 4.0 - - - - 1.0 - 1.0 - - - - - - - 11.0 -

Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with »» are part of a longer accumulation, which is marked like this on the final day. Values over 100 mm have been rounded to the nearest whole millimetre. Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
This table is very wide; you may have to scroll sideways to see all the days, and you may need to set the paper to 'landscape' to print.


Notes

A Monthly Climate Summary is prepared to list the main features of the weather in Sydney - Greater Sydney using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.

This statement has been prepared based on information available at 9 am on Tuesday 2 October 2012. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages are long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 20 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Further information

Media
(03) 9669 4057
Enquiries