Your Cruise, Your Weather
Plan Your Cruise With Free Weather Forecasts
Loading Travel Forecast…Loading Travel Forecast…Loading Travel Forecast…Historical averages and packing recommendations for your September visit to Juneau.
"Rain returns, foliage changes"
Affiliate links — these help keep our site free by earning us a commission at no extra cost to you.
Juneau is Alaska's capital and the gateway to some of the most spectacular wilderness on earth. Accessible only by sea or air, it sits between steep mountains and the Inside Passage — a dramatic backdrop for whale watching, glacier hikes, and float-plane adventures. The Mendenhall Glacier, just 12 miles from downtown, is one of the most accessible glaciers in the world.
Juneau in September brings cooler conditions, with highs around 56°F — pack layers alongside your warm-weather gear. September sees roughly 19 rainy days, so waterproof layers and flexible plans are wise. Showers are often short-lived but can be intense. Rain returns, foliage changes
Crowds are moderate in September, making it a good balance between availability and weather. Dress in layers: a waterproof shell over a mid-layer handles the range between cool mornings and afternoon port temps.
Voyage of the Glaciers Grand Adventure
Princess Cruises · Jul 1, 2026
Alaska Horizons Seattle to Seattle
Oceania Cruises · Jul 2, 2026
Alaska Horizons Seattle to Seattle
Oceania Cruises · Jul 2, 2026
Voyage of the Glaciers Grand Adventure
Princess Cruises · Jul 4, 2026
Alaska Roundtrip Collectors' Voyage
HAL Cruises · Jul 5, 2026
Alaska Inside Passage & Glacier
Carnival Cruises · Jul 6, 2026
The average high temperature in Juneau during September is 56°F, with a low of 44°F.
Juneau typically sees 19 days of rain in September. Rain returns, foliage changes
For a September cruise to Juneau, you should pack warm layers, a waterproof jacket, and thermal wear.
Most PopularJuneau Wildlife Whale Watching
From $151
Book Now
Budget PickJuneau Wildlife Whale Watching & Mendenhall Glacier
From $249
Book Now