In March, Napa typically sees daytime highs of 17.3°C and overnight lows around 4.7°C. Compared to the annual average high of 21.5°C, March runs -4.3°C.
March in Napa averages a daytime high of 17.3°C and an overnight low of 4.7°C.
March runs -4.3°C compared to Napa's annual average high of 21.5°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 17.3°C and cooler evenings around 4.7°C.