Best time to cruise · Best time to go
Alaska cruises in August
August is the top month for bears fishing salmon streams, and humpbacks are often bubble-net feeding in Icy Strait and Chatham Strait. It’s still mild, but rain becomes more frequent late in the month, especially around Ketchikan. Darkness returns at night, bringing the first chance of spotting the northern lights from the deck.
- Best time to go
- Avg high 65°F
- 15 hrs daylight
Photo: Pat W. Sanders, CC BY 2.0, via Wikimedia Commons
Alaska in August: Best time to go
August is the top month for bears fishing salmon streams, and humpbacks are often bubble-net feeding in Icy Strait and Chatham Strait. It’s still mild, but rain becomes more frequent late in the month, especially around Ketchikan. Darkness returns at night, bringing the first chance of spotting the northern lights from the deck.
Across Alaska cruise ports, August brings average highs around 65°F (18°C) and lows near 56°F, with about 7.2 inches of rain over the month and roughly 15 hours of daylight.
- Verdict
- Best time to go
- Season
- Late April to early October; warmest and busiest June to August.
- Average high / low
- 65°F / 56°F
- Rainfall (month)
- 7.2 in
- Daylight
- About 15 hours
- Typical cruise length
- 7 nights; 10 to 14 days with a Denali land tour
What to pack: warm-weather clothes with layers: shorts and light pants, a sweater or light jacket for breezy evenings on deck, and comfortable walking shoes. It's one of the wetter months, so bring a compact umbrella or rain jacket.
How August compares with the rest of the year
- Jan: No regular sailings
- Feb: No regular sailings
- Mar: No regular sailings
- Apr: Shoulder season
- May: Good time to go
- Jun: Best time to go
- Jul: Best time to go
- Aug: Best time to go
- Sep: Good time to go
- Oct: Shoulder season
- Nov: No regular sailings
- Dec: No regular sailings
- No regular sailings
- Shoulder season
- Good time to go
- Best time to go
Alaska weather in August
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F (°C) | 362 | 362 | 405 | 468 | 5412 | 6016 | 6519 | 6518 | 5915 | 5010 | 405 | 373 |
| Low °F (°C) | 29-1 | 28-2 | 31-1 | 373 | 457 | 5111 | 5613 | 5613 | 5010 | 426 | 331 | 30-1 |
| Rain in (mm) | 10.4263 | 7.0178 | 6.4163 | 5.9149 | 5.1130 | 4.7120 | 5.2132 | 7.2183 | 9.0230 | 11.0280 | 10.6269 | 10.6270 |
| Daylight (hrs) | 8 | 10 | 12 | 14 | 16 | 18 | 17 | 15 | 13 | 10 | 8 | 7 |
August weather port by port
| Port | Avg high | Avg low | Rain | Daylight |
|---|---|---|---|---|
| Juneau | 62°F | 54°F | 11.9 in | 15 h |
| Ketchikan | 66°F | 55°F | 8.6 in | 15 h |
| Skagway | 63°F | 54°F | 6.1 in | 16 h |
| Glacier Bay National Park | 60°F | 54°F | 12.4 in | 15 h |
| Sitka | 61°F | 56°F | 7.8 in | 15 h |
| Icy Strait Point (Hoonah) | 64°F | 55°F | 8.5 in | 15 h |
| Hubbard Glacier | 59°F | 54°F | 7.2 in | 16 h |
| Tracy Arm & Endicott Arm | 62°F | 54°F | 11.0 in | 15 h |
| Seattle | 77°F | 58°F | 0.9 in | 14 h |
| Vancouver | 77°F | 62°F | 2.4 in | 14 h |
| Victoria | 71°F | 58°F | 1.0 in | 14 h |
| Seward (Anchorage) | 59°F | 53°F | 8.9 in | 16 h |
Average daily highs and lows, 2015–2024, from NASA POWER, adjusted to sea level. Rain is the average monthly total.
Other great cruise destinations in August
Alaska in August: FAQs
Is August a good time to cruise Alaska?
Yes, it's one of the best months. August is the top month for bears fishing salmon streams, and humpbacks are often bubble-net feeding in Icy Strait and Chatham Strait. It’s still mild, but rain becomes more frequent late in the month, especially around Ketchikan. Darkness returns at night, bringing the first chance of spotting the northern lights from the deck.
What is the weather like on a Alaska cruise in August?
Across Alaska cruise ports, August brings average highs around 65°F (18°C) and lows near 56°F, with about 7.2 inches of rain over the month and roughly 15 hours of daylight. Conditions vary from port to port and day to day.
What should I pack for a Alaska cruise in August?
Pack warm-weather clothes with layers: shorts and light pants, a sweater or light jacket for breezy evenings on deck, and comfortable walking shoes. It's one of the wetter months, so bring a compact umbrella or rain jacket. Check your cruise line's dress code for evenings.
When is the best time to cruise Alaska?
Late April to early October; warmest and busiest June to August.. The best months are usually June, July, August.
Where else can I cruise in August?
August is also a top month for Canada & New England, Northern Europe, Norwegian Fjords, Baltic Sea, British Isles.
Updated November 2026 by the BookMyDreamCruise editorial team. How we research and fact-check.
Sources: NASA POWER climate data.