Kalgoorlie has recorded three months worth of rain during the last week.

Kalgoorlie's running monthly total as of 9am on Friday was 47mm, which predominantly came from two thunderstorms during the last six day. This running total is already three times Kalgoorlie's October average of 15mm and makes this its second wettest October since 1981.

Storms were prolific across inland areas of WA on Friday as a low pressure trough crossed the state, with more than 122,000 lightning strikes detected within a 200km radius of Kalgoorlie.

The moisture feeding into this trough was coming from warmer-than usual water to the northwest of Australia. While the sea's surface has been unusually cool in this region during the past few weeks, it has recently climbed above average. Warmer seas lead to more evaporation and increased atmospheric moisture for rain.

Another trough will spread rain and storms across the central and southern inland of WA on Sunday. It's possible that some of this rain will affect Kalgoorlie once again.