She has a fiery temper.

她脾气暴躁。

《牛津词典》

He's got a fiery temper and flares up at the slightest provocation.

他是火爆性子，一点就着。

《新英汉大辞典》

He has a fiery temper.

他的脾气很火爆。

youdao

Russian newspapers quoted unidentified ballet dancers saying that Dmitrichenko had a fiery temper.

NPR: Dancer Admits Being Behind Bolshoi Chief Attack

Cantona's fiery temper has got him in trouble before.

BBC: 27 January

He soon made a name for himself with his powerful running, as well as his fiery temper, which once led his London Irish coach Toby Booth to say forlornly: "I've never known a back get so many yellow cards".

BBC: Nervous wait for England's newest star