Suspected firebugs have been in action up and down the coast since Friday, from Thirroul in the north down to Bombo.
The fire at Bombo was the most dangerous, with a house at risk of burning down.
Kiama Fire Station deputy captain Peter Wright said crews were called to a grass fire at Bombo Hill, at the southern end of Riverside Drive.
"There was a house at the top of the hill and it's a pretty inhospitable area in relation to terrain," he said. "There are a few cliff-fronts and the way the fire was blowing it was actually blowing the fire up the hill.
"With the wind and the slope of the terrain the fire was a quick running fire heading up towards that house."
The Fire and Rescue NSW crews responded. Assisted by three from the Rural Fire Service (RFS), they were able to stop the fire and save the house, whose owners were away.
The fire burned out two hectares of grass and Deputy Captain Wright said "it's in a very strange place for a fire to occur".
Police have confirmed they are looking into the circumstances of the fire.
On Friday at 9.30pm four teenagers allegedly started a grass fire in Albion Park while a total fire ban was in place in the region.
It is alleged several 14-year-old boys lit an incendiary device in grassland on Chapman Place about 9pm Friday night.
A grass fire took hold that then threatened a nearby property under construction.
The boys attempted to extinguish the fire without success.
One of the teens then enlisted the help of his father who suffered minor burns to his feet as he tried to put out the blaze.
Fire and Rescue NSW attended and extinguished the fire.
Investigations by detectives from Lake Illawarra Local Area Command led them to four 14-year-old boys and inquiries are continuing.
Police in Worrigee responded on Saturday to several incidents of fires being lit near Old Southern Road. Following inquiries, police interviewed a 49-year-old Worrigee man who was charged with two offences relating to the lighting of fires and is scheduled to appear at Nowra Local Court in the near future.
The RFS also tackled several fires over the weekend.
On Saturday, crews began to bring under control a grass fire at Old Kangaloon Road in Burrawang that had burnt out 11 hectares.
Yesterday there were two small scrub fires, the first of which was at Haywards Bay, near Lake Illawarra.
The three-hectare fire was brought under control by six RFS trucks and about 30 firefighters and no property was threatened.
Just after 9am yesterday, three RFS crews responded to a scrub fire in Philip Street, Thirroul.
The small fire measured less than a hectare and the crews were able to put it out quickly.
A spokesman from the RFS said fire investigation teams would look into the causes of all three fires.
Bushfire expected to be contained today
A bushfire that destroyed a home in the Bega Valley is expected to be fully contained by midday following two days of weather helpful to firefighters.
The Millingandi bushfire, about five kilometres west of Merimbula on the South Coast, is no longer threatening homes on the Princes Highway between Wolumla and Millingandi, however homeowners in the area have been advised to continue monitoring fire conditions. One home, five sheds and a tank have been destroyed in the blaze.
Meantime, firefighters took advantage of Saturday’s cooler conditions to strengthen containment lines around the Deans Gap bushfire. The fire, burning seven kilometres west of Sussex Inlet, reduced in intensity on Friday night, due to the gusty southerly change.
The fire has destroyed more than 9000hectares since it began on January 7. The blaze is not currently threatening any properties but residents have been advised to watch the conditions.
Wandean Road remains closed due to the blaze but residents can access 12 Mile Road, Conjola National Park and Yerriyong State Forest.
Firefighters continued to mop up a fire in the Shoalhaven, which has burnt through 10hectares. The blaze started on Thursday near Barringella Creek, south west of Nowra.