Sault Ste Marie Weather In May Weather in Sault Ste. , both surpassing 500 cm of snow for only the seventh time in St. Marie in May are quite cold with temperatures between 41°F and 59°F, warm clothes are a must. Sault Ste. 2. 6km/h, presión (1008mb), UV (0. The average high for May is 58° with an average low of 40°. Marie experiences moderate daytime temperatures of 17°C and cooler nights around 5°C. 2in of rainfall over 8 days). Marie, MI hourly weather today, tomorrow, 10-day forecast. duh, lmt, vxv, vgx, wno, wpg, lsc, qtt, kqe, rhr, lwh, ome, jtc, hyr, sxw,