This experiment was carried out to evaluate the influence of temperature on carrot seed germination. Commercial seeds lots of the cultivars Nantes, Brasília and Kuronan were germinated in petri dishes according to the temperatures of 20, 25, 30 and 35°C, on germitest paper. The influence of temperature was analysed by the cumulative distribution function of Weibull. There were differences in seed germination according to the temperatures and cultivars. The best germination of Nantes cultivar, 87.99%, was in germinators with temperature of 25°C and 63.21% of them last 3.96 days from the start of the test. The worst performance, 75.40%, was under the temperature of 30°C and last 5.9 days to reach 63.21% of this maximum. The cultivar Brasília had 91.16% and last 3.36 days to reach 63.21% of them according to 25°C and this performance was better than in 20°C. The seeds of cultivar Kuronan had, in 30°C, 76.66% of germination and last 4.92 days to have 63.21% of them while under 20°C the germination was 76.36 and last 3.75 to reach 63.21% of them. These results were analysed according to Repeated Measures Analysis of Variance.