Hampshire's fire service urges people to avoid the use of BBQs and bonfires.
The wildfire has fire spread across about 10 hectares (25 acres) near the Hampshire-Surrey border.
The blaze is estimated to cover about six hectares of heathland, according to the fire service.
Two fires broke out on Saturday evening with a third tackled on Sunday night, fire crews say.
A swan suffered serious injuries after being attacked by two youngsters, Hampshire police said.
The fire spread across about five acres of undergrowth on the heath off the A30 on Friday afternoon.
Residents suffered from "organisational abuse and neglect", the Care Quality Commission said.
Part of the path, which runs from Newport to Sandown on the Isle of Wight, has been prone to flooding.
Zoltan Pohner says he located two snakes, one of which was dead, following a police appeal.
