Diablo & Ross Lakes
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Today’s Forecast:
Today’s Report:
Paddling
Use Caution for paddling. High near 84°F. Low rain risk (4%). Breezy winds (13 mph).
- Temp: Favorable conditions
- Rain: Favorable conditions
- Wind: Marginal weather factor
- Thunderstorm: Favorable conditions
Boating
Use Caution for boating. High near 84°F. Low rain risk (4%). Breezy winds (13 mph).
- Temp: Favorable conditions
- Rain: Favorable conditions
- Wind: Marginal weather factor
- Thunderstorm: Favorable conditions
Camping
Excellent for camping. High near 84°F. Low rain risk (4%). Light wind (13 mph).
- Temp: Marginal weather factor
- Rain: Favorable conditions
- Wind: Favorable conditions
- Thunderstorm: Favorable conditions
About Diablo & Ross Lakes
Diablo & Ross Lakes is a Washington destination for turquoise reservoirs, overlooks, boat routes, remote camps, and Highway 20 access through the North Cascades.
Make the Most of a Diablo & Ross Lakes Day
Cold water, canyon wind, smoke, and limited landing options deserve extra margin. Verify boat transport and remote access before relying on them.
Weather Tips for Diablo & Ross Lakes
- Compare valley and high-elevation forecasts because snow, wind, clouds, smoke, and temperature can change sharply with elevation.
- 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:
- Diablo Lake Overlook
- Newhalem
- Colonial Creek Campground
- Ross Dam
- Thunder Creek
- North Cascades Highway
- Hozomeen
Plan Around the Conditions
Use the forecast to choose the best version of a Diablo & Ross Lakes 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 Diablo & Ross Lakes
Diablo & Ross Lakes Weather by Season
Winter
Winter at Diablo & Ross Lakes brings mountain snow, ice, short daylight, and changing road or trailhead access. Higher routes may close while lower valleys remain rainy, so check current transportation notices.
Spring
Spring around Diablo & Ross Lakes 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 Diablo & Ross Lakes 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 Diablo & Ross Lakes 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 45–49°F near reservoir level, using the relevant local or regional elevation context.
- Annual snowfall: snowfall is moderate near the water and very heavy on surrounding Cascade slopes, 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: November through January.
- Driest season: July and August.
- Best outdoor window: June through September for boating and camping.