Firefighters are battling several blazes sparked by lightning strikes across southern parts of the state overnight.

A fire at Uleybury near Gawler burnt 100 hectares of farmland near Kentish Road after it started about 4:00am.

About 50 firefighters helped to contain the fire, but Country Fire Service incident controller Mark Thompson says mopping up will take some time.

"Trees are still burning in the gullies so I'd say we're going to be here for another three to four hours before we can declare this safe," he said.

Crews are also battling five blazes near Delamere on the southern Fleurieu Peninsula, with slippery off-road conditions creating problems.

There are also scrub fires at Penola and north of Naracoorte in the south east.

About 30,000 lightning strikes have been recorded across South Australia in the past 24 hours as showers and strong winds develop.

Meanwhile, a series of deliberately-lit fires in the Davoren Park area in Adelaide's north overnight are being investigated.

Police believe two youths set fire to trees and shrubs in Westwood and Bratton Streets and to the front porch of a house in Sandford Road about 3:45pm.

The residents of the Sandford Road house managed to extinguish the fire before it caused serious damage.

 

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