In March, Portland typically sees daytime highs of 4.7°C and overnight lows around -4.0°C. Compared to the annual average high of 12.6°C, March runs -7.9°C.
March in Portland averages a daytime high of 4.7°C and an overnight low of -4.0°C.
March runs -7.9°C compared to Portland's annual average high of 12.6°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 4.7°C and cooler evenings around -4.0°C.