Grand Coulee & Lake Roosevelt, WA
Today’s Forecast:
Today’s Report:
Boating
Good for boating. High near 63°F. Risk of rain later today (34%). Light wind (10 mph).
- Temp: Marginal weather factor
- Rain: Marginal weather factor
- Wind: Favorable conditions
- Thunderstorm: Favorable conditions
Camping
Excellent for camping. High near 63°F. Risk of rain later today (34%). Light wind (10 mph).
- Temp: Favorable conditions
- Rain: Marginal weather factor
- Wind: Favorable conditions
- Thunderstorm: Favorable conditions
Outdoor Events / Activities
Use Caution for outdoor events / activities. High near 63°F. Risk of rain later today (34%). Light wind (10 mph).
- Temp: Favorable conditions
- Rain: Marginal weather factor
- Wind: Favorable conditions
- Thunderstorm: Favorable conditions
About Grand Coulee & Lake Roosevelt
Grand Coulee & Lake Roosevelt is a Washington destination for the major dam, long reservoir, launches, campgrounds, scenic drives, and seasonal visitor events.
Make the Most of a Grand Coulee & Lake Roosevelt Day
Distances are large and reservoir wind can rise quickly. Check water level, ramps, heat, smoke, fire restrictions, and event schedules.
Weather Tips for Grand Coulee & Lake Roosevelt
- Check heat, wind, wildfire smoke, and fire restrictions as closely as rain because exposed eastern routes offer limited shade.
- Cold water, waves, current, wind, and lightning should guide water plans more than sunshine alone.
- Check overnight lows, wet ground, fire rules, drainage, and the nearest substantial shelter before settling into camp.
- Summer smoke, winter access, shoulder-season closures, and shorter fall daylight can matter even during an otherwise mild forecast.
Nearby Towns and Areas
This page can also be useful when planning outdoor time near:
- Grand Coulee Dam
- Coulee Dam
- Fort Spokane
- Spring Canyon
- Kettle Falls
- Banks Lake
- Columbia River
Plan Around the Conditions
Use the forecast to choose the best version of a Grand Coulee & Lake Roosevelt day. Match wind, precipitation, smoke, water conditions, trail surfaces, road access, temperature, and daylight to the activity that gives your group the safest and most comfortable plan.
7-Day Forecast for Grand Coulee & Lake Roosevelt
Grand Coulee & Lake Roosevelt Weather by Season
Winter
Winter at Grand Coulee & Lake Roosevelt brings cold air, periodic snow, ice, and strong wind. Roads and exposed trails can stay slick even during otherwise dry stretches.
Spring
Spring around Grand Coulee & Lake Roosevelt brings changing conditions, rising rivers, wet trails, and lingering mountain snow. Cold water from rain and snowmelt remains a major planning factor. Mountain and eastern thunderstorms become increasingly possible later in the season.
Summer
Summer at Grand Coulee & Lake Roosevelt is usually the driest and most dependable season, but wildfire smoke, fire restrictions, heat, and afternoon thunderstorms can interrupt plans. Use calmer mornings for boating or paddling and keep a shore-based backup. Dry vegetation makes local fire rules especially important.
Fall
Fall at Grand Coulee & Lake Roosevelt brings cooler temperatures, shorter daylight, changing color, and the return of wetter weather west of the Cascades. Water cools faster than the air, increasing cold-water consequences. Check seasonal facility hours and allow extra time on busy event or salmon-viewing weekends.
Key Climate Data Points
- Annual average temperature: around 50–53°F, using the relevant local or regional elevation context.
- Annual snowfall: generally around 10–25 inches depending on location, with substantial year-to-year and elevation variation.
- Warmest months: July and August are normally warmest.
- Coolest months: December and January are typically coolest.
- Wettest season: late fall and winter.
- Driest season: July and August.
- Best outdoor window: May through September for boating and camping, with mornings favored in summer.