In May, Fountain Valley typically sees daytime highs of 21.4°C and overnight lows around 12.3°C. Compared to the annual average high of 22.1°C, May runs -0.6°C.
May in Fountain Valley averages a daytime high of 21.4°C and an overnight low of 12.3°C.
May runs -0.6°C compared to Fountain Valley's annual average high of 22.1°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 21.4°C and cooler evenings around 12.3°C.