Shikoku Weather - Shikoku, Japan Forecast - TripAdvisor Shikoku weather essentials. |. Monthly Averages. Month. High. Low. Precip. Jun. 75°F 23°C. 65°F 18°C. 13 in 34 cm. Jul. 81°F 27°C. 72°F 22°C. 19 in 49 cm.
