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The temperature in Oahu stays approximately the same throughout the year, averaging seventy to eighty five degrees at any given time. However, wind and rain vary with the seasons, so visitors should be aware of standard weather patterns when planning their trips. It should be noted that the geographic design of Oahu makes it such that weather varies greatly in different parts of the city. As a result, visitors experiencing poor weather conditions in one area of Oahu should spend the day in a different area to avoid the problems. Southwest Oahu is usually warmer and drier than Northeast Oahu.
In general, the summer months in Oahu are considered to be the least rainy and the winter months are considered to be the rainiest. Hurricanes are rare and not a factor in deciding when to go (as is the case with the Caribbean). Tsunamis are relatively rare and can’t be predicted so visitors can’t plan around them. Warning sirens are located throughout the islands.
In terms of having to deal with other tourists, the busy season is from December through March, with the last two weeks of December being the prime time during which many people travel to Oahu. Rates tend to be higher during this busy season. In contrast, late spring and early fall are the times of the year during which fewer tourists tend to be in the area, decreasing rates in the area. With the economic slow down tourism has dropped dramatically and "busy" times are no longer a real factor except for late December. Attractions remain open and fall visitors can experience the Aloha Festivals popular in the area.