GRAND JUNCTION, Colo. – The Grand Valley wakes under a cold, starlit sky this morning, the air still and faintly frosted on parked windshields. Autumn’s calm grip holds steady across western Colorado, but temperatures will dip sharply over the next 48 hours — bringing crisp mornings and the season’s first widespread frost to lower valleys.
According to the National Weather Service in Grand Junction, Sunday will stay mostly sunny and mild with highs near 70°F. East winds around 10 mph turn light this afternoon. Monday marks the transition day, as a cooler, drier air mass slides in from the north. Daytime highs fall into the mid-60s, while clear skies and calm winds set up prime conditions for strong cooling after sunset. By early Tuesday, temperatures could drop near freezing across Mesa and Delta counties, especially along the Colorado and Gunnison River basins.
Residents are urged to protect tender plants and disconnect garden hoses before Monday night. Drivers should also watch for frost on bridges and shaded stretches along U.S. 50 and I-70 west of Rifle. Despite the cold start, afternoons remain comfortable, with abundant sunshine and light winds through Wednesday.
The dry, tranquil pattern will continue into Halloween weekend — ideal for trick-or-treating and late-season yard cleanup. Daytime highs should recover into the low 60s by Friday, with crisp evenings slipping into the 40s by dusk.
To be fair, this gentle chill won’t last long. Early November models hint at a stronger cold front and potential mountain snow chances — a clear sign winter’s waiting just over the Divide.
Five-Day Forecast for Grand Junction, CO:
Sun: 70/45 – Mostly sunny; light afternoon wind.
Mon: 64/32 – Sunny; cooler late day.
Tue: 56/33 – Clear, cold morning; sunny afternoon.
Wed: 61/37 – Bright and calm; mild day.
Thu: 62/40 – Sunny; pleasant Halloween setup.
