Offers in-app purchases

OpenSummit is your trusted source for the most accurate weather forecast, high-resolution map overlays, air quality, and trail conditions information.

"From smoke to lightning, trail conditions to wind chill, OpenSummit is the one-stop-shop for planning my summer adventures." - Cody Townsend, Pro Athlete

Conveniently compare forecasts on a single screen, plan summit days with 5-day hourly forecasts, view estimated trail conditions, track storms (and wildfire smoke) with high-resolution maps, and stay safe in the backcountry with offline maps.

Forecasts for Mountains, Not Nearby Towns

Most weather apps only provide forecasts for nearby towns. With OpenSummit, you'll receive hourly forecasts for the actual mountain location (and elevation). This means that our precipitation, lightning, temperature, and wind forecasts are more accurate when planning your next mountain objective.

Plan Summit Days With Confidence

Choose the safest day and time for your adventure. We color-code detailed hourly data so that you can quickly find your best weather window. 5-day hourly forecasts include the chance of precipitation, chance of lightning, temperature, wind speed & direction, and cloud cover.

Know Trail Conditions In Advance

Before heading out on your next hike or mountain bike ride, check our estimated trail conditions. We use recent weather conditions to estimate if the trail is snow-covered, muddy, a little wet, or dry, and this information is updated every hour.

Track Storms & Air Quality In High-Resolution

We make it easy (and beautiful) to see if there is precipitation and wildfire smoke heading towards your location, and if there is snow cover, lightning, or poor air quality nearby. You can also take a peek into the future with our 2-day forecast animations for precipitation, wildfire smoke, cloud cover, wind gust, and temperature.

Save Offline Maps

Headed out of service? Download and save high-resolution satellite and terrain base maps to be able to see your exact location on the map, even without cell service.

Free Account Benefits Include:

• Favorite Locations List
• 2-Day Hourly Forecasts

All-Access Benefits Include:

• 5-Day Hourly Forecasts
• Estimated Trail Conditions
• Offline Maps
• Current & Forecast Radar
• Wildfire Smoke Forecast Maps
• Air Quality Map
• Real-Time Lightning Map
• Estimated Snow Depth Map
• Estimated 24-Hour Snowfall Map
• Cloud Cover Map
• Wind Gust Map
• Temperature Map
• OpenSnow All-Access

Remove Carbon From The Atmosphere

To help mitigate the threat of climate change, we have committed 1% of our All-Access subscription sales to the direct removal of carbon dioxide from the atmosphere and its sequestration in secure, long-term storage.
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What's New

Thanks for using OpenSummit! This update includes:

• Android 12 Support
• Share Maps
• Share Location Forecasts
• 24-Hour Air Quality Animation
• 2-Day Map Forecasts
• Other minor improvements & bug fixes

Please help us improve the app even more by sending feedback to

Also, if you enjoy the app, please rate it and write a review. Thank you!
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Additional Information

October 27, 2021
Current Version
Requires Android
7.0 and up
Content Rating
Interactive Elements
In-App Purchases
In-app Products
$19.99 - $39.99 per item
Offered By
Cloudnine Weather LLC
Cloudnine Weather 637B South Broadway #131 Boulder, CO 80305
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