The best time to go to Fort Yukon is during the summer months, from June to August, when the weather is mildest and the daylight hours are longest.
During this period, temperatures are generally comfortable, ranging from 15°C to 25°C, making outdoor activities more enjoyable. You'll also experience the "midnight sun," with nearly 24 hours of daylight, which is a unique phenomenon for many travellers. This extended daylight allows for more time to explore and participate in local events.
For those interested in wildlife viewing and fishing, late June and July are particularly good. The Yukon River is filled with salmon, and local guides can arrange fishing excursions. Birdwatchers will also find this a rewarding time, as many migratory species are present.
If you're seeking to experience the Northern Lights, the best time to visit would be from late August through to April. However, be prepared for much colder temperatures, often dropping well below freezing, and significantly shorter daylight hours.