Juneau in August: Rainy Days, Mendenhall Glacier, Mount Roberts and Tracy Arm

On an August morning in Juneau, the cruise docks on South Franklin Street are already busy, gulls are working the water, and cloud sits low on the mountains behind the shops. The light stretches well into the evening, the rain forest is deep green, and the town keeps a working-harbor rhythm. August here is a month for glacier views, a tram ride above the channel and long days in the Tongass National Forest, for travelers who accept that rain is part of the scene.

Juneau under its mountains in late summer · Illustration

What is the weather like in Juneau in August?

August in Juneau is cool, damp and still long on daylight: jacket weather by day, sweater weather by night, with showers that come on many days.

Month	Average high (°F)	Average low (°F)	Precipitation (in)	Days with precipitation	Daylight on the 15th
July	64.0	50.1	5.14	11.6	17 h 39 min
August	62.9	49.1	6.41	13.5	15 h 30 min
September	56.1	44.1	9.15	17.0	12 h 56 min

Afternoons usually stay in the low 60s, comfortable for walking if you are dressed in layers and a waterproof shell. Nights are cool but never freezing, and no snow falls in August at the airport. A lot of the rain arrives as drizzle or a gray, steady spell rather than a thunderstorm, so a day can start wet and brighten, or the reverse.

The daylight is generous, with long evenings that allow a late walk after dinner. The light is soft when clouds break, and the mountains often appear and vanish within an hour. The glacier, the summit of Mount Roberts and the open water of the fjords can each feel colder and wetter than the town.

What to do in Juneau in August

Juneau is a state capital with no road out of town, hemmed in by water and mountains, and August is the month when its main sights are at their greenest. Most days revolve around ice, forest and the waterfront, and the weather decides the order.

Downtown is compact. South Franklin Street runs along the docks, lined with shops, galleries, diners and bars, and the steep streets above hold the old wooden houses of the capital. Between sights, a coffee or a seafood lunch is easy to find, and the harbor is a pleasant place to watch floatplanes and boats come and go.

Mendenhall Glacier

Mendenhall Glacier sits about 12 miles from downtown Juneau, inside the 5,815-acre Mendenhall Glacier Recreation Area, part of the Tongass National Forest. The glacier is about 13.6 miles long, and from the viewing areas you see its blue-white face above a lake dotted with small icebergs.

Cloud can hide the ice for a while and then lift without warning, so a gray morning is not a reason to cancel. The forest around the recreation area, dripping and mossy in August rain, is part of the visit. Bring a waterproof jacket, since the glacier makes its own chill.

Mount Roberts by tram

The Goldbelt Tram starts at the cruise docks on South Franklin Street and makes a six-minute climb up Mount Roberts, to about 1,800 feet. At the top you find a restaurant, a theater, a shop and a nature center, along with trails that lead up and down the mountain.

On a clear day the view takes in the channel, the docks and the islands beyond. On a cloudy one, the mountaintop can be wrapped in mist, which has its own mood. The trails from the top let you stretch the visit into a walk through alpine meadow and spruce.

Glacier Gardens and the rain forest

Glacier Gardens is a garden set into the Tongass rain forest. Its Flower Towers are upside-down trees turned into living sculptures with cascading blooms, and August color suits them well. The Rainforest Adventure Tours use 18-passenger golf carts on a two-mile path through the forest.

At the top of the tour you get panoramic views over Mendenhall Valley and the Chilkat Mountains. It is a good choice for a wet day, when the forest looks its richest and the mist hangs in the trees.

Tracy Arm and Endicott Arm

Tracy Arm lies about 45 miles south of Juneau, off Holkham Bay and next to Stephens Passage, in the Tongass National Forest. It is the heart of the Tracy Arm-Fords Terror Wilderness, designated by Congress in 1990, which covers 653,179 acres and takes in two narrow fjords, Tracy Arm and Endicott Arm.

Steep rock walls, waterfalls and floating ice define these fjords. Some cruises include Endicott Arm and Dawes Glacier, among them Royal Caribbean’s seven-night Alaska Adventure from Seattle, which runs from June through August.

Bears live in Alaska, and the Alaska Department of Fish and Game says people must keep all human sources of food secure from them. That applies to picnics, campsites and trailheads alike.

A two-day itinerary for Juneau in August

Day 1 starts downtown, when the docks are still calm. Have a coffee on South Franklin Street, then ride the Goldbelt Tram up Mount Roberts while the morning cloud is still moving, and walk some of the trails from the top. If the summit is socked in, the nature center and theater are the shelter.

Come down for a seafood lunch near the waterfront, then spend the afternoon browsing the galleries and the steep streets of the old town. With daylight stretching past 15 hours, a harbor walk after dinner is easy and the evening light is soft.

Day 2 heads to the valley for Mendenhall Glacier, early enough to enjoy the viewing areas before the busiest hours. Walk the forest around the recreation area and take your time at the lake edge, where the ice shows its blue.

Spend the afternoon at Glacier Gardens, with the Flower Towers and the rain forest tour, which works well if rain has set in. Finish with dinner back in town, at a pub or a fish house near the harbor. If the weather turns badly, the tram’s indoor spaces and the covered garden paths are the fallback.

Is Juneau busy in August?

Yes, August is part of the cruise season, and the docks are lively with ships calling in town.

Norwegian’s Alaska cruises call at Juneau among other ports, and Royal Caribbean’s Alaska Adventure runs through August, so the waterfront and the tram base on the docks feel the traffic. The pace of the town follows the ships: busy around the docks during the day and calmer in the evening once visitors return aboard.

For quieter moments, go to Mendenhall or the forest paths early, or linger downtown in the evening. The ferry is another way in, and the Alaska Marine Highway System offers a Sailing Calendar and a Sailing Search tool for checking schedules.

What to pack for Juneau in August

Pack for cool, damp days and mild evenings, with things that dry quickly.

A waterproof jacket with a hood, because rain falls on many days.
Warm layers such as a fleece, for the glacier and the tram summit.
Waterproof shoes with grip, for wet forest paths and trails.
A hat and light gloves, for cold air near the ice and on the water.
A small daypack with a dry bag, to protect a camera and phone.
A sleep mask, since evenings stay bright for a long time.

Good to know before you go

Juneau’s main sights cluster around the docks and the Mendenhall Valley, and the weather is the thing to plan around. Bears are part of the landscape, so keep food secured wherever you go.

Juneau in August vs July and September

Moving the trip to July brings a little more warmth and noticeably longer days, with the light lasting deep into the evening. It also brings less rain. Cruise traffic is also in full swing then, so the waterfront stays lively.

September is cooler and wetter, with the days shorter and rain on more than half the days. The forest turns moodier and the light is shorter, which suits people who like a quiet, gray atmosphere more than long evenings. Cruise offerings may thin out as the season winds down.

Choose July if you want the longest days and the driest weather of the three. Stay with August for a balance of reasonable light and mild temperatures. Pick September if you do not mind the rain and want a calmer feel.

Is August a good time to visit Juneau?

Yes, August suits travelers who love green forest, glaciers and long evenings, and who are happy to carry a rain jacket.

It is a good month for people who like to combine a tram ride, a glacier and a garden in the rain forest, and for anyone drawn to fjord cruising toward Tracy Arm and Endicott Arm. It suits less well anyone who needs steady sunshine or dry trails, since showers fall on many days.

On arrival, start with Mendenhall Glacier or the tram, depending on which way the clouds are moving, and keep the garden and the waterfront for the wet hours. August in Juneau is a month of wet forest, blue ice and light that lingers over the channel into the evening.

Sources

NOAA NCEI, U.S. Climate Normals 1991-2020, monthly (https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&stations=USW00025309), station Juneau Intl Ap, elevation 16 feet, checked October 11, 2026
Computed from the date and the latitude of the place (sunrise equation, solar elevation -0.833 degrees), October 11, 2026
Alaska Department of Transportation, Alaska Marine Highway System, Schedules (https://dot.alaska.gov/amhs/schedules.shtml), checked October 11, 2026
Princess Cruises, Alaska cruises (https://www.princess.com/en-us/cruise-destinations/alaska-cruises), checked October 11, 2026
Holland America Line, Alaska cruises (https://www.hollandamerica.com/en/us/cruise-destinations/alaska-cruises), checked October 11, 2026
Norwegian Cruise Line, Alaska cruises (https://www.ncl.com/cruise-destinations/alaska-cruises), checked October 11, 2026
Royal Caribbean, Alaska cruises (https://www.royalcaribbean.com/cruise-destinations/alaska-cruises), checked October 11, 2026
National Park Service, Lake Clark National Park & Preserve, plan your visit: conditions (https://www.nps.gov/lacl/planyourvisit/conditions.htm), checked October 11, 2026
National Park Service, Katmai National Park & Preserve, plan your visit (https://www.nps.gov/katm/planyourvisit/index.htm), checked October 11, 2026
Alaska Department of Fish and Game, Living with bears (https://www.adfg.alaska.gov/index.cfm?adfg=livingwithbears.main), checked October 11, 2026
Glacier Gardens Rainforest Adventure, Juneau (https://www.glaciergardens.com/), checked October 11, 2026
Wikipedia, Mendenhall Glacier (https://en.wikipedia.org/wiki/Mendenhall_Glacier), checked October 11, 2026
Wikipedia, Mount Roberts Tramway (https://en.wikipedia.org/wiki/Mount_Roberts_Tramway), checked October 11, 2026
Wikipedia, Tracy Arm (https://en.wikipedia.org/wiki/Tracy_Arm), checked October 11, 2026
Wikipedia, Endicott Arm (https://en.wikipedia.org/wiki/Endicott_Arm), checked October 11, 2026
Wikipedia, Climate of Alaska (https://en.wikipedia.org/wiki/Climate_of_Alaska), checked October 11, 2026