The Mackay region has been the worst hit by thunderstorms that have drenched Queensland since the weekend, with Paget copping 304mm in the 24 hours to 9am on Monday.

The downpour flooded the Mackay Christian College campus and grounds - forcing the school's closure on Monday - along with roads throughout the region.

Heavy rain has also been blamed for a landslide near Sarina, south of Mackay, that restricted access to a northbound lane.

The State Emergency Service has helped Mackay residents sandbag their properties.

Drivers have been urged not to try to cross flooded areas with the RACQ saying on Monday that more than 170 roads were now closed.

Showers and thunderstorms are forecast to continue throughout the state until Wednesday which could cause more rivers to break their banks.

"Heavy falls from thunderstorms could lead to flash flooding in addition to the riverine flooding throughout much of southern and eastern Queensland at the moment," Bureau of Meteorology senior meteorologist Helen Reid said.

"Many rivers are in flood, lots are at moderate level, some are at major as well, particularly in the south.

"Rivers that don't already have a minor flood warning have a flood watch covering most of eastern and southern Queensland."

Severe thunderstorms with heavy rainfall are possible across the state except the southeast and far west in the next 48 hours, she said.

The Central Highlands near Rockhampton and the central west are expected to be among the hardest-hit areas.

The Bureau also "wouldn't rule out the possibility" of damaging wind gusts and large hail in southern Queensland in the coming days.

Australian Associated Press