Queensland reaching record temperatures

Queenslanders can expect more sweltering weather on Sunday.

The heat wave enveloping southwest Queensland's channel country again pushed the mercury to new highs, with Thargomindah enduring a record 48.5C on Saturday.

A severe fire danger has been declared for the channel country.

Hot dry conditions combined with overgrown bush have helped fuel fires, with about 34 burning across the state.

Severe thunderstorms have been forecast for parts of the state's northwest, central west and southeast, including Camooweal, Boulia, Dajarra, Warwick, Boonah and Tambo on Saturday afternoon.

Queensland Bureau of Meteorology senior forecaster Michelle Berry told AAP most of Queensland can expect more sweltering heat on Sunday.

However, the southeast will experience cooler weather on Monday, due to a southerly wind change.

The Department of Community Safety says no fires are threatening homes and most are under control.

Volunteer fire crews used earth moving equipment to contain a fire burning in bush near Undullah south of Brisbane that has created a smoke haze across the area.

Residents are being urged to keep doors and windows closed. People with respiratory illnesses should keep their medication close by as the haze is expected to continue on Sunday.

Firefighters continue to monitor three fires sparked by lightning strikes on Thursday, west of Gympie.

Two of the fires, burning at Cloyna and Redgate, are not under control, however a third, at Elgin Vale, is being monitored.

Queensland's first king tide of the year hit the coast on Saturday morning, with a peak of 2.8 metres on Brisbane's bayside.

The Department of Community Safety says there have been no reports of any damage to homes or injuries.

King tides occur when the gravitational pull between the moon and sun align.

-AAP