THE Sunshine Coast may not have had a cyclone to contend with, but yesterday's extreme humidity claimed more than a few victims.

Tradies and people working outdoors and in ceilings have been doing it particularly tough in the tropical humidity fuelled by Cyclone Yasi.

In Nambour, the relative humidity reached as high as 92% overnight on Tuesday, dropping slowly during the day to 65% by 2pm, before increasing again.

Concrete pump operators Peter Stewart and Brad Kowalski spent nearly seven hours pumping concrete into the walls of the new pool at the University of the Sunshine Coast.

Mr Stewart said it had been a stinker.

“Humid and hot, and no wind,” he said.

Plenty of water needed to be drunk to minimise the effects of the humidity and to prevent dehydration and exhaustion.

Leading hand Adam Fitzsimmons, from Nu-Trend Constructions, said staff had spent the day putting up frames and trusses on a project at North Lakes.

“Some of the boys were vomiting during the eight hours they were on site,” Mr Fitzsimmons said.

Self-employed concreter Mark Brody said he had spent the past two days at Twin Waters cutting concrete and removing it by hand.

He said he had been drinking plenty of water and hosing himself down to keep cool, adding he didn't bother with sunscreen because “it either washes off or sweats off”.

Bureau of Meteorology forecaster Michelle Berry said that the sudden burst of humidity was a result of “a very consistent north-easterly flow coming off the ocean”.

She said with maximum temperatures in the low 30s, there was no major concern for people's health and well-being.

Ms Berry said if temperatures had been higher, the risk of dehydration and exhaustion, particularly among the elderly, would increase.

In humid weather, perspiration on the skin doesn't evaporate quickly, slowing the body's ability to cool down.

Bureau of Meteorology figures show the average daily relative humidity on the Coast in February is 71%.

Todd, come on down to central or south Florida in August.  We have 90% humidity at 2am.  And the temperature usually dont get in the low eightys, even overnight.

We are looking at moving from California to Leander Texas.

Leander is nice. I am about an hour from there. we are supposed to get snow on thursday night. It is pretty humid in the summer but not bad. But the changes are crazy. We had a high of 82 on Sunday and the past 2 days it hasnt gotten above freezing. It got up to 25 today.

very cool, i cant wait to have a beer with you.

81 today, 75 tomorrow, and 83 on Friday.  Florida does have its good points.

My girl friend just brought home a calendar with a bunch of fire men doing this type of stuff without shirts. We should do the same thing! you know some hose between our legs. Nothing on but a remote. that type of stuff! HAH