DESPITE predictions of rain, skies over Warwick remained blue and sunny throughout the week - but Bureau of Meteorology weather forecaster John Gardener said it was time to pull out the umbrella, with rainfall almost a sure thing today.

"It should be wet today and that should clear away probably overnight and then it will cool down," he said.

"There may even some morning frosts."

He said today and tomorrow would be cooler with a slight chance of patchy frosts, but it was Sunday that would bring the big chill.

"It is to some extent probably a little unusual that we are getting frosts, certainly we get some cooler periods in the transition from winter to spring but it's just that it's a very powerful change coming through," he said.

Minimum temperatures are set to drop, with a low of eight degrees expected today, before dropping to three degrees tomorrow.

A maximum of 16 is expected today while tomorrow and Sunday should creep up to about 18 degrees.

Warwick West State School are hoping the rain clouds will hold off a little longer for their annual fete today.

The event copped a downpour last year but school Parents and Citizens Association president Tracy Vellacott yesterday said she hoped people would still turn out, even if the weather was a little colder and the day would be successful enough to raise $15,000 for the school.

Money raised from the school's biggest fundraiser of the year will go towards a new playground, reading materials, concrete paths and covered walkways. The fete is set to kick off at 2.30pm today.