Perth has had a dry start to July, but cloud will start to develop from Thursday evening, with showery conditions expected into the weekend.
A broad high pressure system has so far kept skies clear in Perth since Sunday. This has resulted in cold nights and warm days, with minimum temperatures at least three degrees below average each night.
The run of fair weather is coming to an end this week as the high tracks to the east and a cold front approaches Western Australia. Cloud will start pushing into the state's southwest on Thursday evening with a low pressure trough ahead of the front. North-northwesterly winds will precede the trough, although they won't be particularly strong.
Showers are likely to develop in the southwest into Friday night and Saturday, although totals should only be low in Perth, around 5-10mm. On Sunday showers should ease temporarily, as the front passes to the south, before recommencing on Monday with the arrival of a low pressure system. Perth can expect higher rain totals with this system, of 10-20mm. The cloud cover should also keep the day cool, with temperatures a couple of degrees below average.
The Southwest and Great Southern districts may pick up 20-30mm on Monday. So far this winter, rain in these regions has varied from town to town. This rain will, therefore, be warmly welcomed in some areas, while for others it will add to above average winter totals.
Cloud will linger over the southwest until Tuesday and further light showers are possible. The sun should reappear by Wednesday as a high pressure ridge moves into the state and cloud starts to erode.
© Weatherzone 2012
14:32 EST Cattle stations south of Alice Springs are reporting large rainfalls on their properties.