In January, Rialto typically sees daytime highs of 16.4°C and overnight lows around 3.4°C. Compared to the annual average high of 24.7°C, January runs -8.4°C.
January in Rialto averages a daytime high of 16.4°C and an overnight low of 3.4°C.
January runs -8.4°C compared to Rialto's annual average high of 24.7°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 16.4°C and cooler evenings around 3.4°C.