For most families I’d pick June or July, when Juneau averages highs of 62 to 64°F, days run 18 to 19 hours and the salmon runs bring out the bears. May is cheaper and drier, and September is the least crowded but the wettest, with Juneau averaging 8.6 inches of rain.
May: highs around 57°F, nearly 18 hours of daylight, lower fares and the driest month. Humpbacks are migrating and bears are waking up.
June: highs around 62°F and up to 19 hours of light. Busy, but below peak.
July: highs around 64°F, peak salmon runs, peak whale watching and peak prices. It books up fast.
August: bears are feeding hard, crowds ease and it’s wetter.
September: highs around 56°F, the least crowded and the cheapest, with a chance of northern lights.
2027 is already on sale. Princess opened in August 2025, Royal Caribbean in October 2025 and Disney in February 2026.
Quick answers
What is the cheapest month for an Alaska cruise?
May and September.
When is the best time to see whales in Alaska?
Humpbacks are back by June and whale watching peaks in July.
When can you see bears on an Alaska cruise?
Bear viewing peaks mid July to mid August, during the salmon runs.
How rainy is Alaska in September?
Juneau averages 8.6 inches of rain in September, the wettest month of the season.
When should I book a 2027 Alaska cruise?
Now. 2027 sailings have been on sale since 2025, and summer dates go first.
Want help planning this one?
Tell me who’s coming and roughly when, and I’ll take it from there.
Plan my trip with NicoleTake the 2 minute trip quizKeep planning: Alaska travel guide and what an Alaska cruise costs in 2027.
Nicole Damiano, ASTA Verified Travel Advisor with FG Luxury Travel. Adventures We Seek is my travel blog and planning resource. Trips are booked through Favorite Grampy Travels. Prices and dates last checked October 2026 and change often.
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