RIVERTON, Wyo. – Frost glitters across the Wind River Basin this Halloween morning, clinging to rooftops and fence lines under a pale, quiet dawn. The air is sharp but still, and for those heading out early, it feels like winter waiting just around the corner. The good news? Wyoming’s final October weekend will deliver mild sunshine before the next pattern shift arrives in early November.
According to the National Weather Service in Riverton, temperatures will climb steadily through Saturday, rebounding from morning lows in the 20s to afternoon highs in the lower 60s. Light winds and dry air will dominate, creating ideal weather for outdoor work, travel along U.S. 26 and Highway 789, or Halloween festivities later in the day.
Saturday looks to be the weekend’s warmest stretch, with clear skies and calm conditions through sunset. Sunday will stay sunny as well, topping near 68°F before slightly cooler air returns early next week. Clear evenings will allow for efficient cooling, so residents should still protect sensitive plants, livestock waterers, and unheated plumbing from light frost.
Long-range models hint at a pattern change by the middle of next week, possibly pulling colder Pacific air eastward toward the central Rockies. Early November could bring Wyoming’s next round of wintry weather, including the first measurable snow chance for higher elevations near Lander and South Pass.
For now, it’s a calm finish to October — crisp mornings, bright afternoons, and one more beautiful fall weekend before November’s chill starts its slow descent across the Cowboy State.
Five-Day Forecast for Riverton, WY:
Fri: 50/25 – Mostly sunny; cold start, warming afternoon.
Sat: 61/32 – Clear and mild; light wind.
Sun: 68/29 – Sunny and warmer; near-perfect fall day.
Mon: 58/34 – Mostly sunny; cooler breeze returns.
Tue: 67/37 – Partly sunny; early sign of next front midweek.
