August is usually the hottest month of the year in Midway Island, with the average temperatures in the range of 76°F (24.4°C) to 84°F (28.9°C). Very few days register above the 90°F (32.2°C) barrier, and the record for the month remains at 92°F (33.3°C). The rainfall averages 4.3" (109mm) with 15 rainy days in the month. The sunrays are bright, and the ultraviolet index is at a dangerous level of 11. Plants such as bunchgrass and puncture wine thrive in the salty environment where there is a lack of broad-leafed, shady trees. Cruise ship passengers passing through the Pacific can enter the wildlife refuge with the help of boats. The visitors have enough sunlight to explore the island before leaving by 8 p.m. The flat terrain is comfortable for walking, and the horizon is mostly clear, as the ocean waters. Comfortable, loose-fitting summer clothes are suitable during the day in August in Midway Island.