Alaska Climate and Weather

Climate Overview

As one might imagine, Alaska's climate is harsh, with long winters (from mid-October to late April), very short days, and extreme temperatures in some areas that can easily drop below -30°C. That said, given the state's size and geography, this cold is somewhat relative. The Pacific coast (Anchorage), for example, is less prone to extreme cold (though more prone to fog), with winter averages not falling below -10°C. Further south (Juneau), the average hovers around 0°C between December and February.

Winter is followed by a brief spring in May, when melting snow can complicate travel in many parts of Alaska. June to August is the summer period, with temperatures higher inland than on the coast, where rainfall is significant, particularly from August to October. The only exception to this relative mildness is Alaska's northern region (Barrow), facing the Arctic Ocean, where the thermometer rarely exceeds an average of 5°C even during this season. Mid-September to October marks the arrival of autumn.

Best Time to Visit Alaska

While Alaska's winter offers a unique environment and experience, for a "classic" tourist visit, it's best to prioritize the milder months when days are also the longest. June and July are ideal, with the possibility of extending into August and early September, though coastal rains and gradually dropping temperatures make the visit less pleasant.

★★★: very favorable | ★★: favorable | ★: moderately favorable | ⊘: unfavorable.

Sea Temperatures Throughout the Year

Even in its southernmost regions, the water temperature is hardly inviting for a swim.

Alaska Climate and Weather

South Coast (Juneau)

Interior (Fairbanks)

Additional Information