In-app purchases
135 reviews
Content rating
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About this app

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

Get Outside With Confidence

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

Compare Forecasts

Finding the ideal location for your next adventure based on the weather can feel overwhelming. With OpenSummit, deciding where to go is easy. Compare the latest weather forecasts for your favorite locations on a single screen in just a few seconds.

View Estimated Trail Conditions

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 With High-Resolution Maps

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, as well as the global air quality forecast for the next 5 days.

Climate Change Commitment

We send 1% of our All-Access sales to innovative projects that directly remove carbon dioxide from the atmosphere and ensure its sequestration in secure, long-term storage. This alone will not solve climate change, but it’s a start.

OpenSummit All-Access

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

Free Trial

New subscribers that opt-in to the free trial receive the full OpenSummit All-Access experience, with no credit card required, for the next 14 days. If you choose not to purchase All-Access after the 14-day free trial is over, you will be automatically downgraded to a free account and not charged. You will still be able to receive email storm updates and view limited weather forecast data.
Updated on
Sep 19, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App info and performance
This app may collect these data types
Location and Personal info
Data is encrypted in transit
You can request that data be deleted
135 reviews
Shaun McCarthy
November 11, 2022
The weather forecasts are wildly inaccurate, whether it's a mountain peak or ground level. Especially the temperatures, with 10+ degree discrepancies even at ground level. At my location in Colorado, it relies far too heavily on the weather station in Gunnison, which is on the other side of the mountain range and MUCH colder. You'd think this would be core functionality of the app, but it's not. I live right by an airport with a weather station, and it's still 6 degrees off at my house.
Did you find this helpful?
Cloudnine Weather LLC
November 15, 2022
Hi Shaun, we do not use weather stations in our forecasts. We use high-rez weather models to provide the most accurate forecast available. You should check out our winter app, OpenSnow, which now provides the ability to get a forecast for any location, including your home location. Send an email to to chat further. -SAM
Rodney Bell
June 22, 2022
Upgraded to 5*. The best, most useful and uniquely valuable apps I've ever used! Support response is very quick, and feedback & requests for enhanced features (incl. adding locations, campgrounds, etc) are taken seriously and with fast response. Graphs are superb with clever weather variable option buttons below the graphs, making for lots of info. available at a glance with minimum scrolling. My only feature wish is to have forecasts extend to 7 days-paid ver.
3 people found this review helpful
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Cloudnine Weather LLC
June 22, 2022
Thank you so much, Rodney! -SAM
A Google user
July 20, 2019
Just installed today and have been a longtime user of opensnow. Love the clean design of this app just like their other app. Makes checking weather on my favorite peaks simple. The only issue so far is the app goes offline whenever I stop using it, though my phone hasn't lost network connectivity. The only way I have found to resolve it is to shutdown the app and restart it. Once this bug is fixed, I'd give it 5 stars.
6 people found this review helpful
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Cloudnine Weather LLC
August 2, 2019
Jeremy, an update. As of August 1, 2019, we released an update that should fix the offline/network issue. Please download the latest version and let me know if it fixes the problem. Thanks! -JOEL

What's new

Thanks for using OpenSummit! This update includes:

• Maps > Air Quality Forecast
• 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!