Man's body found in western Sydney floodwaters

The man has not yet been formally identified and the cause of the death was unknown, police said in a statement.

The reserve is more than two kilometres east of the Nepean River, which is at minor flood level and expected to rise further.

Almost a dozen parts of Penrith are subject to prepare-to-evacuate warnings.

The man's death is the second associated with the weather system.

The body of a 71-year-old man was found near his submerged ute in a flooded creek southwest of Brisbane on Thursday.