Normally it depends on the season. You will experience a wide range of temperatures from 15 C to –20 C depending on the month you are looking at climbing the Island peak.  If you climbing in April, May, late September, and October the daytime temperatures range from 0c to 15c on the trek in, and typically it is – 5c to – 10c at night on Island peak. Once the sun comes up it gets warmer and we can see the delightful adventurous scenery. Be prepared for every type of weather when climbing the Island peak.