In April, Osan typically sees daytime highs of 17.3°C and overnight lows around 4.8°C. Compared to the annual average high of 16.5°C, April runs +0.8°C.
April in Osan averages a daytime high of 17.3°C and an overnight low of 4.8°C.
April runs +0.8°C compared to Osan's annual average high of 16.5°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 17.3°C and cooler evenings around 4.8°C.