"I have a high temperature."
Translation:Я маю високу температуру.
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Because there's not a direct object of a verb in there. У мене висока температура is literally "there is a high temperature with me", which means high temperature is the subject and has to be in the nominative.
If you used the verb мати, then you would have a direct object and need the accusative form: Я маю високу температуру.