Weather in Alaska

Alaska cruise weather and seasonal climate guide

Alaska Cruise Weather: What to Expect by Month (May-September)

Alaska is our country's northernmost state, located above Canada and closer to the Arctic than the Lower 48. That latitude brings dramatic scenery - glaciers, fjords, and wildlife - and also creates fast-changing conditions. During the May-September Alaska cruise season, many ports and popular inland stops are often cool-to-mild rather than frigid.

Important: Alaska has major microclimates. Coastal 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.

Jump to: Average temperatures | Average precipitation | What to pack | Weather FAQs

Below are average daily high temperatures and average monthly precipitation for major Alaska cruise ports and common land-tour cities during May-September.

Average Temperature (Daily High)

	May	June	July	August	September
Anchorage	58F	66F	68F	66F	57F
Fairbanks	62F	72F	73F	66F	55F
Denali Park	55F	65F	66F	61F	51F
Juneau	58F	62F	64F	63F	56F
Ketchikan	57F	61F	65F	65F	59F
Skagway	58F	63F	65F	63F	57F
Vancouver	62F	67F	72F	72F	66F

Average Precipitation (Monthly Total)

	May	June	July	August	September
Anchorage	0.62 in	0.99 in	1.70 in	2.48 in	3.02 in
Fairbanks	0.54 in	1.48 in	2.26 in	2.10 in	1.35 in
Denali Park	0.84 in	2.42 in	3.12 in	3.01 in	1.74 in
Juneau	3.51 in	3.82 in	5.14 in	6.41 in	9.15 in
Ketchikan	8.68 in	7.02 in	7.33 in	11.30 in	14.30 in
Skagway	1.07 in	1.16 in	1.38 in	2.35 in	3.89 in
Vancouver	2.8 in	2.1 in	2.0 in	2.9 in	5.8 in

What to Pack for Alaska Weather

Most cruise-season days are comfortable, but Alaska weather can change quickly, especially on the water and near glaciers. Plan to dress in layers so you can adapt throughout the day.

Base layer: moisture-wicking top (especially for excursions)
Mid layer: fleece or light insulated jacket
Outer layer: waterproof/windproof shell (helpful for coastal ports)
Footwear: comfortable walking shoes + waterproof option
Extras: hat, light gloves, sunglasses, small daypack

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 so you stay comfortable.

What is the warmest month for an Alaska cruise?

July is typically the warmest month across many Alaska ports and inland stops, 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. A waterproof shell makes a big difference.

Should I expect snow during an Alaska cruise?

Snow is uncommon at sea-level ports during the main cruise season, but higher elevations and glacier areas can be colder year-round. Weather varies by location and elevation.

Last updated: December 2025. Averages shown are seasonal normals compiled from station climate normals where available.