Weather in Alaska

Alaska Cruise Weather by Month (May-September)

Alaska weather can change quickly, especially on the water and near glaciers. During the May-September Alaska cruise season, many ports are cool-to-mild rather than frigid, but conditions vary by region.

Coastal Inside Passage ports (like Juneau and Ketchikan) are usually milder and wetter, while interior locations (like Fairbanks and the Denali area) can be warmer in midsummer but cooler at night. Use the averages below to plan layers and rain gear.

Average Temperature and Rainfall (Cruise Season)

Inside Passage (Typical Mix): Juneau, Sitka, Vancouver

Monthly averages:

Inside Passage (Wettest Port Example): Ketchikan

Monthly averages:

Interior Alaska (Land Tour Favorites): Anchorage, Denali Area, Fairbanks

Monthly averages:

What to Pack for Alaska Weather

Most cruise-season days are comfortable, but conditions can shift quickly. Pack layers so you can adapt throughout the day.

• Base layer: moisture-wicking top
• Mid layer: fleece or light insulated jacket
• Outer layer: waterproof or windproof shell
• Footwear: comfortable walking shoes plus a waterproof option
• Extras: hat, light gloves, sunglasses, small daypack

Tip: Even in July, mornings and evenings can feel cool on deck, and glacier excursions are often colder and windier than town stops.

Alaska Weather FAQs (Cruise Season)

Is Alaska too cold for a cruise in May or September?
Not usually, but it can be cooler and wetter, especially in Southeast Alaska. Pack layers and rain gear.

What is the warmest month for an Alaska cruise?
July is typically the warmest month, with June and August close behind.

Which Alaska cruise ports are the rainiest?
Southeastern ports (especially Juneau and Ketchikan) tend to be much wetter than Anchorage or Fairbanks.

Should I expect snow during an Alaska cruise?
Snow is uncommon at sea-level ports during May-September, but higher elevations and glacier areas can be colder year-round.

Last updated: December 2025.