Summer (June–September) is the main season. Days are hot and dry — Okanogan sits in the rain shadow of the Cascades and receives little precipitation, with July and August temperatures regularly reaching the mid-30s Celsius (mid-90s Fahrenheit). This is the time for hiking into the Pasayten Wilderness; trails at higher elevations are snow-free by mid-June in most years.
Late summer (August–September) is the harvest season in the valley. Fruit stands open up along the roads, the orchards are busy, and the particular smell of warm apples and dry grass defines the valley. If the fruit is any reason to visit, this is when.
Spring (April–May) brings wildflowers to the sagebrush hills and is one of the better periods for birdwatching, particularly for raptors migrating north through the valley. The Okanogan Valley is a recognized raptor migration corridor, and golden eagles, ferruginous hawks, and other species move through in numbers.
Winter is cold, with some snow in town and heavier accumulations in the mountains. Roads to backcountry trailheads are often closed or impassable. There is no ski resort nearby; this is not a winter destination.