A trough and cold front will march across western NSW on Tuesday bringing rain and cooler temperatures. Late on Monday night and very early on Tuesday morning, a trough ahead of cold front will trigger areas of rain for those in the far western NSW. Broken Hill is likely to pick up 2-5mm with up to 10mm possible, most of which will fall before the sun rises on Tuesday. As the day moves on the trough will continue to shift eastwards, taking the rain with it. Ivanhoe should see 5-10mm reach the gauge with 15mm a chance. If more than 8.6mm falls it will be the highest September fall in two years. The rain will spread into the Riverina where places such as Hay could get up to 15mm. A cold front will accompany the trough in its passage across NSW, bringing a much cooler change to region. The start of Spring has been a very warm one for much of the state and the west has been no different. So far in September most locations in the west have had maximums three or four degrees above average. Broken Hill and Tibooburra are both averaging over 5 degrees above average. The cold front will drop maximums by up 14 degrees from Monday to Tuesday. Lake Victoria is forecast to reach 34 on Monday, then just 20 on Tuesday for the start of October. In the Upper Western, Wilcannia is forecast to reach 37 on Monday while Tuesday will only reach 23. Further ahead the dry will return and temperatures will gradually rise through the week. By the weekend maximums will once again reach the thirties in most locations.