Perth Probability of Rain and Likely Amount:

In the Perth rain forecast graph, change the system of measurement by clicking the link on the top right of the graph, WillyWeather will remember your selection for the next time you visit. To find the closest rain forecast locations to Perth, see the 'closest locations' link and the map in the sidebar to the right.

WillyWeather sources its probability of precipitation information from the Australian Bureau of Meteorology. The probability of precipitation information that we receive from the BoM, for a particular day may contain many different chances of rainfall and corresponding amounts of rain. We take the chance that it will rain from the file, then we display what we believe to be the most likely amount that will fall. Please also note that the Perth rain forecast for each day actually starts the previous night. The Perth rainfall period for each day goes from 8:00pm the night before to 8:00pm the following day. So there will be occasions where late showers on one day will be displayed in the forecast of the following day.