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Home › 28-day Rainfall Forecast › Sydney Rainfall Forecast

Sydney 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
24
high
25
26
low
27
med
28
high
29
med
30
31
med
Jun 1
med
2
low
3
low
4
med
5
low
6
med
7
med
8
low
9
low
10
med
11
12
med
13
med
14
med
15
low
16
med
17
med
18
low
19
med
20
low
Chance of rainfall within district
nil
< 25%		 low
25% to 50%		 med
50% to 75%		 high
≥ 75%

Issue Notes

The hemispheric long wave pattern has been relatively fast moving in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, New Zealand, and the southeast Pacific.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 27 May to 31 May, 2 June to 6 June, and 10 June to 14 June. Rain events originating in the tropics and moving south are possible about 2 June to 6 June, and 6 June to 10 June.
Over Western Australia the strongest cold fronts should occur about 28 May to 1 June, 2 June to 6 June, and 10 June to 14 June.

Issued May 22

Forecast Explanation

This forecast is produced by a multi-model ensemble consisting of dynamical atmospheric models, which are forced by the latest observed atmosphere, ocean, land and ice conditions. The models are designed to simulate features of the real atmosphere, including the daily movement of long and short wave patterns in the Southern Hemisphere.

The future probability of rain in each district is estimated using output from the multi-model ensemble, combined with historical information about the difference between the model forecasts and observed rainfall.

In this deterministic framework the skill of the forecast tends to decrease with time, however the forecasts are updated daily to provide the latest estimates of rainfall probability out to 28 days.

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