In May, Barreiro typically sees daytime highs of 21.1°C and overnight lows around 12.7°C. Compared to the annual average high of 20.0°C, May runs +1.1°C.
May in Barreiro averages a daytime high of 21.1°C and an overnight low of 12.7°C.
May runs +1.1°C compared to Barreiro's annual average high of 20.0°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 21.1°C and cooler evenings around 12.7°C.