In March, Costa Mesa typically sees daytime highs of 19.2°C and overnight lows around 9.1°C. Compared to the annual average high of 22.1°C, March runs -2.8°C.
March in Costa Mesa averages a daytime high of 19.2°C and an overnight low of 9.1°C.
March runs -2.8°C compared to Costa Mesa's annual average high of 22.1°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 19.2°C and cooler evenings around 9.1°C.