According to WeatherZone data, before this year the longest it had taken to exceed five millimetres in autumn was 46 days and that was in 1994.

The rest of this week will be bone dry for southwest WA, much the same as the last three weeks.

But rain is just around the corner.

The next rain will arrive in Perth early next week when a high finally moves east from the Bight and allows a front to make an impact on the southwest of the state.

This will signal the turning of the season. Showers initially will be light but are likely to become more frequent and heavier as the week wears on as more fronts extend further inland.

Showers will even penetrate to inland areas which have been extremely dry recently.

Lake Grace in the Great Southern has not had a drop of rain so far this autumn, the driest start to the season in 96 years of records.

Much of the Southwest Land Division will finally see the break of season with the second half of the month turning much wetter than the first half.