Two powerful systems are producing heavy showers and cold temperatures in Western Australia, with cloud blanketing most of the state. A tropical low is situated just to the northwest of WA and over the last few days has spread cloud across most of the state, and even into South Australia. Last night this system started producing light showers in the state's west. This system will cause isolated heavy falls between Coral Bay and Onslow today and tomorrow. From Thursday the system will decay significantly as a high pressure system takes over. The other powerful system affecting Western Australia is a cold front. This front has brought heavy showers to the west coast. Jandakot gained 24mm by 9am this morning, its heaviest June rain in three years. In the south, Windy Harbour amassed 31mm, its heaviest rain since October. The showers will ease in the west today as the front continues on its path across the south of the nation. Showers will spread along the south coast during the next few days in chilly southwesterlies. Perth will see dry conditions from this evening through to the end of the week under a high pressure system. The cold air mass and cloud associated with this front are producing a cold day across the southwest quarter of the state. Perth will remain around 16 degrees for most of today, whilst further inland some places will struggle to reach 15 degrees under the cloud. From tomorrow, daytime temperatures will be slightly warmer under the sunshine, but mornings will be much colder with clear skies and light winds combining with the cold air mass.