In June, Napa typically sees daytime highs of 27.3°C and overnight lows around 10.7°C. Compared to the annual average high of 21.5°C, June runs +5.7°C.
June in Napa averages a daytime high of 27.3°C and an overnight low of 10.7°C.
June runs +5.7°C compared to Napa's annual average high of 21.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 27.3°C and cooler evenings around 10.7°C.