In April, Napa typically sees daytime highs of 20.0°C and overnight lows around 5.8°C. Compared to the annual average high of 21.5°C, April runs -1.5°C.
April in Napa averages a daytime high of 20.0°C and an overnight low of 5.8°C.
April runs -1.5°C compared to Napa's annual average high of 21.5°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 20.0°C and cooler evenings around 5.8°C.