In October, Sunnyvale typically sees daytime highs of 22.0°C and overnight lows around 9.8°C. Compared to the annual average high of 19.2°C, October runs +2.7°C.
October in Sunnyvale averages a daytime high of 22.0°C and an overnight low of 9.8°C.
October runs +2.7°C compared to Sunnyvale's annual average high of 19.2°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.0°C and cooler evenings around 9.8°C.