In May, Allentown typically sees daytime highs of 22.0°C and overnight lows around 8.9°C. Compared to the annual average high of 16.2°C, May runs +5.8°C.
May in Allentown averages a daytime high of 22.0°C and an overnight low of 8.9°C.
May runs +5.8°C compared to Allentown's annual average high of 16.2°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.0°C and cooler evenings around 8.9°C.