Much of south-east Queensland is sweltering as residents endure another day of heatwave conditions.

The Bureau of Meteorology (BOM) said temperatures were expected to reach up to 40 degrees Celsius in a band from Esk, south to Gatton and down to Beaudesert.

Forecaster Andrew Bufalino said high overnight temperature were making conditions more uncomfortable.

"We're seeing temperatures around 24 or 25 over a broad area of south-east Queensland and this is because of the combination of both the hot air mass and the very high moisture levels," he said.

"In fact we're actually seeing temperatures [that] feel like around that 30 degree mark overnight."

Mr Bufalino said it would be a little cooler on the coast due to the sea breeze.

"The strip from around Esk down to Gatton and through to Beaudesert are expecting the hottest temperatures around about 38 to 40 degree mark," he said.

"Currently the hottest temperature we're going for is Gatton with 40 degrees."

Dry cleaner Tai Van says he drinks about eight litres of water a day on hot days. ( ABC News: Andree Withey )

Tai Van, who has worked in his Brisbane dry cleaning business at Corinda for 30 years, said it could often be 45C working in his shop on a hot day.

"The secret is to drink a lot of cold water — I drink about seven, eight litres a day, not to mention after work," he said.

"Every now and then we have a sip of water, wash our face, have a mini-shower wherever you go — that keeps us alive.

"You feel like a punching bag the next morning, your body's sort of aching.

"[But] the minute I arrive [back] here, everything's back to normal and you just do it — we're well conditioned — just like any other job you get used to it."

The bureau cancelled its severe thunderstorm warning for Queensland just before midday yesterday, saying the immediate threat of severe thunderstorms had passed.

It said the situation would continue to be monitored and further warnings would be issued if necessary.