Sydney in September 2011: Warm start to Spring

  • Average rainfall.
  • Above average maximum temperatures.
  • Above average minimum temperatures, equal 11th warmest on record.

Rainfall

Rainfall was close to average during September, with 71.6 mm recorded at Sydney Observatory Hill compared to the average of 68.9 mm, and above average rainfall in western suburbs. The rain fell over 10 days, average for September, with the majority of rain occurring in a single event on the 25th and 26th associated with moist easterly flow. Two-day totals reached 53.8 mm at Observatory Hill and up to 112.2 mm at Turramurra, with daily falls reaching 65 mm at Mona Vale on the 25th.

Sydney's water storage is currently at 78.6% of capacity, an decrease of 0.3% from the beginning of the month but 20.8% higher than at this time in 2010. Current water storage information can be found on the Bureau of Meteorology Water Storage web site.

Temperature

The average maximum temperature at Observatory Hill during September was 21.7 °C, 1.7 °C above average, with above average temperatures recorded throughout the city. Two days exceeded 30 °C during the month, above average for September, reaching 32.5 °C on the 23rd, the warmest September day since September 28th 2008.

The average minimum temperature at Observatory Hill was 12.5 °C, 1.4 °C above the historical average of 11.1 °C and the equal 11th warmest on record, with warmer than average nights recorded throughout the city. Only three nights during the month dropped below 10 °C, well below the September average of eleven nights, the equal 6th fewest on record.

The mean daily temperature was 17.1 °C during the month, 1.5 °C above average.

Wind

Easterly winds were predominant in Sydney during September, with 65% of 3pm winds at Sydney Airport between NE and SE, slightly above average for September. Three strong wind days were reported at the Airport during the month, with 8 strong wind days across the Metropolitan region. Winds reached 96 km/hr at Richmond RAAF associated with a southerly change on the 29th.

Other phenomena

Sydney Airport recorded an average of 7.7 hours of sunshine during September, close to the historical average of 7.9 hours. There were no thunderstorms observed at the Airport, but storms were reported in the Metropolitan area on the 7th, 24th, and 29th, including reports of small hail at Parramatta North on the 29th.

Further information

Media
(03) 9669 4057
Enquiries

Extremes in September 2011
Hottest day 32.5 °C at Sydney (Observatory Hill) on the 23rd
Warmest days on average 23.1 °C at Penrith Lakes AWS
Coolest days on average 20.1 °C at Terrey Hills AWS
Coldest day 12.4 °C at Springwood (Valley Heights) on the 25th
Coldest night -0.6 °C at Camden Airport AWS on the 13th
Coolest nights on average 7.2 °C at Camden Airport AWS
Warmest nights on average 12.5 °C at Sydney (Observatory Hill)
Warmest night 17.5 °C at Sydney (Observatory Hill) on the 20th
Warmest on average overall 17.1 °C at Sydney (Observatory Hill)
Coolest on average overall 14.7 °C at Camden Airport AWS
Wettest overall 137.6 mm at Mona Vale Golf Club
Wettest day 65.0 mm at Mona Vale Golf Club on the 25th
Highest wind gust96 km/h at Richmond RAAF on the 29th

Summary statistics for September 2011
Maximum temperatures
for September
(°C)
Minimum temperatures
for September
(°C)
Rainfall
for September
(millimetres)
Mean for
September
2011
Diff
from
average
Highest for
September
2011
Mean for
September
2011
Diff
from
average
Lowest for
September
2011
Total for
September
2011
Average
for
September
Rank of
September
2011
Fraction of
September
average
Badgerys Creek AWS 22.1   31.0 23rd 7.8   1.2 13th 68.4
Bankstown Airport AWS 21.9 +0.4 31.0 23rd 9.1 +0.4 4.3 13th 65.8 45.1 high 146%
Camden Airport AWS 22.3 +0.4 30.9 23rd 7.2 +0.4 -0.6 13th 62.6 40.1 high 156%
Campbelltown (Mount Annan) 22.1   30.8 23rd 7.6   0.6 13th 40.6
Canterbury Racecourse AWS 21.4   30.8 23rd 9.0   3.6 13th 65.4
Holsworthy Control Range 21.6   30.5 23rd 8.0   1.4 13th 55.0
Horsley Park Equestrian Centre AWS 22.0   31.2 23rd 9.3   2.9 13th 82.8
Parramatta North (Masons Drive) 22.0 +0.4 31.5 23rd 9.8 +0.5 5.3 10th 102.8 54.5 v high 189%
Penrith Lakes AWS 23.1   32.4 18th 9.4   3.4 13th 68.4
Prospect Reservoir 22.1 +0.8 30.4 23rd 9.7 +0.3 4.0 13th 57.7 47.1 high 123%
Richmond RAAF 22.3   32.0 18th 7.7   0.9 13th 87.4
Riverview Observatory 21.4 +0.7 31.0 23rd 10.7 +1.3 5.2 13th 71.9 62.4 average 115%
Springwood (Valley Heights) 21.1   31.2 18th 9.7   5.0 13th 86.4 55.9 high 155%
Sydney (Observatory Hill) 21.7 +1.7 32.5 23rd 12.5 +1.4 7.4 10th 71.6 68.9 average 104%
Sydney Airport AMO 21.7 +1.2 32.1 23rd 12.3 +2.0 6.6 10th 53.6 60.8 average 88%
Terrey Hills AWS 20.1   29.6 23rd 10.9   5.8 10th 118.0

Daily rainfall
Hunter (61)123456789101112131415161718192021222324252627282930
Webbs Ck-Wisemans Ferry (Hawkesbury Rive - - - - - - - - 2.0 6.5 0.5 - - - - - - - - - - - - - 10.4 35.5 - - 7.0 0.5
Central Tablelands (South) (63)123456789101112131415161718192021222324252627282930
Sackville Ferry (Hawkesbury River) - - - - - - 0.2 - 6.8 2.8 - - - - - - - - - - - - - - 19.2 43.8 - - 10.4 0.8
Springwood (Valley Heights) - - - - - - 2.4 0.2 »» 1.2 - - - - - - - - - - - - - 3.4 19.0 37.6 - - 7.0 0.2
Valley Heights (Sun Valley Rd) - - -
0.2 - 1.8
15.0 1.0

-






-
- 3.4 19.0 40.0
- 8.0 0.2
Metropolitan (East) (66)123456789101112131415161718192021222324252627282930
Abbotsford (Blackwall Point Rd) - - - »» - - 2.0 - 2.4 4.1 - 0.4 - - - - -






20.0 28.0

12.0 4.0
Auburn (Rosnay Golf Club) - - - - - - 1.0 - 5.0 1.0 - 1.0 - - - - - - - - - - - - 15.0 24.0 - - 5.0 1.0
Audley (Royal National Park) - - - - - - 3.0 - 15.0 3.0 - - - - - - - - - - - - - - 27.0 23.0 - - 7.0 1.0
Avalon (Wollstonecraft Ave) - - - - - - - 2.0 8.0 3.0 - - - - - - - - - - - - - - 50.0 47.0 1.0 - 17.0 -
Avalon Beach (Avalon (Palmgrove Rd))







8.6 3.4














37.0 2.2


Bankstown Airport AWS - - - - - - 1.2 - 13.8 1.6 - 0.2 - - - - - - - - - - - - 15.6 27.8 - - 5.6 -
Belrose (Evelyn Place) 0.8




0.8
5.4 4.0













34.6 50.2 1.0
9.0 0.4
Campbelltown (Ingleburn (Long Point)) - - - - - - 3.0 - 5.0 2.0 - - - - - - - - - - - - - - 27.0 23.0 - - 9.0 -
Canterbury Racecourse AWS - - - - - - 1.0 - 3.8 2.4 - - - - - - - - - - - - - - 26.8 24.2 - - 5.8 1.4
Castle Cove (Rosebridge Ave) 2.5






5.0 3.0













35.0 60.0

9.0
Chatswood Bowling Club 1.0 - - - - - - - 5.0 2.0 - - - - - - - - - - - - - - 24.0 39.0 - - 7.0 1.0
Collaroy (Long Reef Golf Club) 0.6






4.8 0.6













34.2 37.2

9.8
Concord Golf Club





3.0
5.8 2.4
0.2











21.8
34.8


Cronulla South Bowling Club





2.6















0.6 »» 31.0

5.4
Guildford (Woodville Golf Club) - - - - - - 1.0 - 6.0 1.0 - - - - - - - - - - - - - - 15.0 23.0 - - 5.0 -
Holsworthy Control Range - - - - - - 1.8 0.2 10.6 2.4 - - - - - - - - - - - - - - 18.4 14.8 - - 6.4 0.4
Lidcombe (Carnarvon Golf Club) - - - - - - - - 3.0 1.0 - - - - - - - - - - - - - - 6.0 22.0 - - 6.0 -
Liverpool-Scrivener St (Georges River) - - - - - - 2.0 - 18.0 1.0 - - - - - - - - - - - - - - 12.0 24.0 - - 6.0 -
Lucas Heights (ANSTO)







4.8 3.2













20.8 26.4

9.6 0.4
Macquarie Park (Willandra Village)






















0.4 41.2 36.8



Manley / Warringah (Allambie) 1.5 0.5 - - - - 0.5 0.5 4.0 3.0 - - - - - - - - - - - - - - 27.0 42.0 1.0 0.5 8.0 0.5
Manley / Warringah (Belrose) 0.5 - - - - - 0.5 - 1.5 3.5 - - - - - - - - - - -
- - 34.5 42.0 - 0.5 7.5 0.5
Marrickville Golf Club - - - - - - 1.0 - 4.0 2.0 - - - - - - - - - - - - - 1.0 31.0 25.0 - - 6.0 1.0
Milperra Bridge (Georges River) - - - - - - - - 14.0 - - - - - - - - - - - - - - - 11.0 26.0 - - 4.0 -
Mona Vale Golf Club - - - - - 0.2 - - 6.8 2.0 - - 0.2 - - - - - - 0.2 - - - 1.6 65.0 45.0 1.4 - 15.2 -
Parramatta (Erts) - - - - - - - 0.5 3.0 1.0 - - - - - - - - - - - - - - 23.5 29.5 - - 6.5 0.5
Parramatta North (Masons Drive) 0.2 - - - - - 2.0 - 5.6 1.8 - 0.6 - - - - - - - - - - - - 41.0 40.2 - - 9.4 2.0
Peakhurst Golf Club - - - - - - 1.0 - 9.0 3.0 - - - - - - - - - - - - - - 13.0 19.0 - - 5.0 -
Randwick Bowling Club
1.0



2.4
5.2 2.0
0.2

















Riverview Observatory - - - - - - - 2.0 4.4 2.0 - - - - - 0.1 - - - - - - - 0.6 21.3 33.5 - - 7.6 0.4
Rose Bay (Royal Sydney Golf Club) 2.0 0.2



1.4
6.2 9.0












0.2 22.4 21.4 0.2
8.2 2.6
Sans Souci (Public School) - - - - - - 1.0 - 5.0 2.0 - - - - - - - - - - - - - - 12.0 17.0 1.0 - 1.0 -
St Ives (Richmond Avenue)







»» 10.0













38.6 51.2 0.4

10.8
Strathfield Golf Club - - - - - - 1.0 - 5.0 2.0 - - - - - - - - - - - - - - 18.0 28.0 - - 6.0 2.0
Sydney (Observatory Hill) - - - - - - 2.4 - 4.4 1.6 0.2 - - - - - - - - - - - - 0.2 23.8 30.0 0.4 - 7.8 0.8
Sydney Airport AMO - - - - - - 1.0 - 2.8 2.0 - - - - - - - - - - - - - 0.2 21.4 19.8 - - 5.0 1.4
Terrey Hills AWS - - 0.2 - - - - 0.2 5.2 3.0 - 0.2 - - - - - - - - - - - - 47.4 51.4 - - 9.8 0.6
Turramurra (Kissing Point Road) 2.4




1.4
3.2 4.2
0.6











50.0 62.2 0.4
10.0 0.8
Metropolitan (West) (67)123456789101112131415161718192021222324252627282930
Abbotsbury (Fairfield City Farm) - - - - - - 2.0 - 17.0 1.0 - - - - - - - - - - - - - - 20.0 26.0 - - 8.0 -
Badgerys Creek AWS - - - - - 0.6 1.8 - 7.2 2.0 0.2 - - - - - - 0.2 - - - - - 0.2 22.2 22.6 0.2 0.2 10.8 0.2
Baulkham Hills (Swimming Pool ) - - - - - - 1.5 - 4.5 2.5 - - - - - - - - - - - - - - 29.5 41.5 - - 9.5 2.5
Baulkham Hills Eucalyptus Ct - - - - - - 1.0 0.5 5.0 2.5 - - - - - - - - - - - - - - 35.5 41.0 - - 9.0 2.5
Berowra (Goodwyn Road)







7.4 3.8













31.4 49.8


-
Blacktown (Dog Pound) - 0.5 - - - - 0.5 - 6.5 1.5 - - - - - - - - - - - - - - 24.5 25.5 - - 8.0 -
Box Hill (Hynds Road) - - - - - - 1.0 - 5.0 2.0 - - - - - - - - - - - - - - 22.0 31.0 - - 11.0 -
Castle Hill (Kathleen Ave)





2.0
5.0 4.0
0.4

0.1








32.0 48.4

10.0
Glenorie (Old Northern Rd)







7.0 3.0













24.0 38.0

12.2
Greystanes (Cumberland Golf Club) - - - - - - - 0.5 5.5 1.5 - - - - - - - - - - - - - - 16.5 27.0 - - 7.0 -
Hawkesbury River (Sackville Downstream) - - - - - - 0.5 - 0.5 3.0 - - - - - - - - - - - - - -
42.0 -

1.0
Horsley Park Equestrian Centre AWS - - - - 3.6 4.8 1.6 - 14.8 1.6 0.2 - - - - - - - - - - - - - 20.6 27.0 -
8.6 -
Kelso Ck (Kelso Creek U/S Levee (Georges - - - - - - 2.0 - 18.0 2.0 - - - - - - - - - - - - - - 12.0 22.5 - - 5.5 -
Kings Langley (NSW Soccer Federation) - - - - - - 1.5 - 5.5 2.5 - - - - - 0.5 - - - - - - - - 27.0 34.5 - - 9.5 1.5
Kings Langley (Solander Rd) - - - - - - 1.2 - 5.2 2.8 - - - - - - - - - - - - - - 38.8 34.0 - - 8.8 1.6
Liverpool (Michael Wenden Centre) »» »» »» »» »» »» »» »» »» 19.0 0.3 0.2 - - - 0.2 - - - -









Lower Portland (Hawkesbury River) - - - - - - - - 8.8 5.0 0.2 - - - - - - - - - - - - - 12.4 43.4 0.2 - 10.6 0.2
Maroota (Tobruk) - 0.2 - - 0.2 - - - 0.2 - - 0.2 - - - - - - - - - - - - - 0.2 - - 0.2 -
Merrylands (Welsford Street)







5.0 3.2













25.2 20.2

8.2
Merrylands West (Finlayson Creek) - - - - - - 1.0 - 10.0 3.0 - - - - - - - - - - - - - - 28.0 34.5 0.5 - 8.5 -
North Parramatta (Burnside Homes) - - - - - - 1.5 - 5.0 2.0 - 0.5 - - - - - - - - - - - - 39.0 34.0 - - 8.5 2.0
North Rocks (Muirfield Golf Club) - - - - - - 3.0 - 7.0 2.5 - - - - - - - - - - - - - - 52.0 54.0 - - 11.0 3.5
Northmead Bowling Club - - - - - - 1.0 - 5.0 1.5 0.5 - - - - - - - 0.5 - - - - - 38.0 33.5 - - 7.0 2.0
Parramatta (Baulkham Hills West (Sierra - - - - - - 1.0 - 5.0 2.0 - - - - - - - - - - - - - - 34.5 33.0 - - 8.0 1.5
Penrith Lakes AWS - - - - - - 1.2 0.2 13.4 1.0 0.2 - - -
- - - - - - - - 0.2 17.6 25.8 -
8.8 -
Prospect Reservoir - - - - - - 1.0 - 7.4 1.4 - - - - - - - - - - - - - - 16.9 22.8 - - 8.2 -
Richmond RAAF - - - - - - 0.8 0.2 6.0 2.4 0.2 - - - - - - - - - - - - 0.2 22.2 47.0 - 0.2 8.0 0.2
Seven Hills (Radio FM 103.2) - - - - - - - - 5.0 1.5 0.5 - - - - - - - - - - - - - 27.0 26.5 - - 8.0 -
Seven Hills (Collins St)







4.0 4.8













34.4 32.6

8.6
South Creek (Elizabeth Drive) -


























4.5
St Clair (Juba Close) - - - - - - - - 14.0 - - - - - - - - - - - - - - - 11.0 15.0 - - 7.0 1.0
Toongabbie Bowling Club - - - - - - 0.5 - 4.5 2.0 0.5 - - - - - - - - - - - - - 33.0 32.5 - - 8.0 -
Toongabbie Ck (Redbank Road (Toongabbee - - - - - - 0.5 - 5.0 1.5 0.5 - - - - - - - - - - - - - 31.5 33.0 - - 8.5 0.5
West Pennant Hills (Cumberland S F Alert - - - - - - 2.0 - 3.5 3.0 - - 0.5 - - - - - - - - - - - 34.0 43.0 0.5 - 8.0 3.5
Willmot (Resolution Ave) - - - - - - - - 5.0 1.0 - - - - - - - - - - - - - - 21.0 25.0 - - 7.0 -
Windsor SWC (Hawkesbury River) - - - - - - - - - - - - - - - - - - - - - - - - - 1.0 - - 1.0 -
Illawarra (68)123456789101112131415161718192021222324252627282930
Camden Airport AWS - - - - - - 0.2 - 1.8 2.2 - - - - - - - 0.2 - 0.2 - - - 0.2 12.0 33.6 - - 12.2 -
Camden Valley Golf Resort - - - - - - - - 4.0 2.0 - - - - - - - - - - - - - - 10.0 20.0 - - 9.0 -
Campbelltown (Kentlyn (Georges River Roa - - - - - - 1.0 - 4.0 3.0 - - - - - - - - - - - - - - 11.0 27.0 - - 9.0 -
Campbelltown (Mount Annan) - - - - - - 0.6 - 2.6 2.6 - 0.2 - - - - - - - - - - - - 11.0 13.4 - - 10.0 0.2
Rossmore (South Creek) - - - - - - 2.0 - 6.0 2.0 - - - - - - - - - - - - - - 27.0 22.0 - - 10.0 1.0

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 4 October 2011. 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