"Even though it went well this summer, with a combination of luck and skill - we must draw the conclusion that Sweden is not sufficiently secure from future big forest fires," said Jan-Åke Björklund, who led the inquiry.
The report found that officials reacted too slowly and too cautiously to fighting the fires in 2018. Some of those involved in fighting the blazes took too long before asking for help from helicopters and the risk assessment was in parts "chaotic", according to the inquiry.
In particular, there was a problem in smaller municipalities, where fire fighters were not part of a bigger structure of rescue services.
Some 300 different forest fires raged in Sweden during the summer of 2018, in areas ranging in size from a football pitch to up to 9,000 hectar.
72 million to three counties worst afffected by summer wildfires2:03 min 2:03 min
Climate scientist: Forest fires will become more common1:55 min 1:55 min
Extreme natural disasters "new reality" for Europe, EU official says2:40 min 2:40 min