Sydney has gone over a month without any rain in the gauge, but showers could hit Saturday football finals. All Sydney suburbs have endured the last 35 days with less than 1mm, with many suburbs remaining completely dry. Penrith has been amongst the driest, with no day recording more than 1mm in the past 75 days. This extended dry spell in western Sydney, and in the lower Blue Mountains, played a significant role in this week's bushfires. However, this will come to an end overnight and into Saturday with the arrival of a band of rain due to a low pressure trough. Patchy rain is likely to develop in Sydney during the evening, with the entire basin expected to get periods of rain overnight. On Saturday rain will continue through much of the morning, meaning that the ground will be pretty wet for the NRL double header at Allianz Stadium and the Swans v Carlton game at ANZ Stadium. Thankfully for the fans the heaviest and most consistent rain is likely to move offshore with a deepening low pressure system around the middle of the day, allowing the sun to produce a warm afternoon. This low should then direct the odd shower onto the Sydney coastline, possibly getting the raincoats out at the NRL in the late afternoon or evening. Come Sunday and showers will clear early leading to a mostly sunny day. In the late evening rain will begin to develop ahead of soggy start to the working week. Rain will clear during Tuesday ahead of a mostly sunny middle of the week. By Tuesday afternoon the previously dry Sydney basin is likely to have gained widespread 20-40mm, with the chance of more near the coast. This will help put out any fires still burning in the Blue Mountains.