OpenSummit is your personal weather forecaster for the mountains.

Plan your next mountain adventure with the best hourly weather forecasts for over 1,000 locations across the United States.

Conveniently displayed on your iOS device, this valuable weather information will help you make well-informed, timely decisions on your next mountain adventure.

-Chance of Precipitation
-Lightning Potential
-Wind Speed & Direction
-Cloud Cover

Detailed hourly forecasts for the next two days are free. View the 3-5 day hourly forecast by upgrading to All-Access.

— All-Access, In-App Purchase —

Payment for All-Access entitles you to All-Access usage and its features. All-Access is an auto-renewable subscription, which will renew yearly at $19.99. Payment will be charged to the user's iTunes Account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. The account will be charged for renewal within 24-hours prior to the end of the current period and identify the cost of the renewal at that time. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase.

Full terms and conditions can be found here: and

Sales through Apple iTunes will be governed by Apple’s refund policy. We value all of our customers and encourage you to provide feedback on your experience. Please get in touch with us at

What’s New

Version 1.5.1

Thanks for using OpenSummit! This update includes:

• 'Nearby Mountains' map view on every mountain screen
• 'Your Mountains' map view on the Basecamp screen
• Removed 'Near Town, State' from the Basecamp screen
• 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 on the App Store. Thank you!

Ratings and Reviews

4.7 out of 5
35 Ratings

35 Ratings

Colintre ,

Indispensable App for Hikers

I hike or summit peaks in Colorado year-round and this is my go-to app for planning and making sure I don’t get into dangerous or unpleasant weather situations. I love the five-day layout that color codes each day by the forecasted weather so I can tell at a glance when to plan my hikes. If I am going on a day of marginal weather, the hourly forecast has proved accurate and helpful to time my start and finish to avoid severe weather. I am impressed at how many peaks are covered by the forecast and always find one that is where or near I am going. This is a must-have app for any serious (or even casual) Colorado hiker.

Developer Response ,

Right on and that's our goal, to help you at-a-glance figure out the best days, then dial into the hourly details as your hike/adventure gets closer. -JOEL

Love2ski&climb ,

Useful, easy, accurate, a must have!

Excellent app for mountain weather forecasts with lots of useful additional info all in one place! I’ve used it often to plan hikes and climbs and found the accuracy to be spot on. I wouldn’t think of going into the mountains without checking OpenSummit first.

Developer Response ,

Great to hear and thank you so much for the review! -SAM


An excellent way to get summit weather predictions quickly

I’ve been using the app for all of my 14er’s this summer, and has been great. Quick and accurate up to date forecasts in seconds. Highest possible recommendation

Developer Response ,

Thank you so much for the awesome review and we’re so glad that we could help conquer all of the 14er’s this summer! -SAM


All-Access 1-Year Subscription
5-day hourly mountain weather forecasts


Cloudnine Weather LLC
57.7 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2019 OpenSummit
In-App Purchases
  1. All-Access 1-Year Subscription $19.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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