Mirena is a hormonal intrauterine device (IUD) that's inserted into the uterus for long-term contraception. Mirena prevents pregnancy for up to five years. Mirena is a hormonal intrauterine device (IUD) that can provide long-term birth control (contraception). The device is a T-shaped plastic frame that's inserted into the uterus, where it releases a type of the hormone progestin.
If you want to avoid the crowds and take advantage of lower prices, May, early June and September are the best times for an Alaska cruise. In May and early June the weather is drier; in September there are noticeably less mosquitoes than during the height of summer.
Best Time of Year to Go on an Alaskan Cruise Summary. We warned you that there was no clear cut answer to this question. We did a late season Alaskan cruise on Celebrity Solstice. On our September 2014 cruise, the weather was unseasonably warm and dry, with only one day of rain in Ketchikan (which is a given no matter when you cruise).