LuckGrib 4+

#1 for sailors and enthusiasts

Craig McPheeters

    • 4.9 • 24 Ratings
    • Free
    • Offers In-App Purchases



LuckGrib is a fully featured, easy to use, fast GRIB reader, viewer, downloader and weather router. Remote access to weather data via satellite or email is supported. Advanced weather routing capabilities, for sailors, is available.

Weather forecast data, packaged as GRIB files, can be downloaded directly from the LuckGrib server cluster.

For offshore sailors, LuckGrib offers a best-in-class, complete solution: industry leading visualization and ease of use, highly optimized weather data downloads via satellite, along with industry leading optimized weather routing and route analysis. Inshore sailors may not require satellite downloads, but will benefit from the rest of the system.

LuckGrib is unique among apps that were originally designed for sailors, in that the weather analysis tools are powerful enough to attract attention from meteorologitsts.

For meteorologists, and weather enthusiasts, LuckGrib offers access to a wide range of high resolutions models, a number of global models, weather data at the surface, 850mb, 500mb and 250mb levels, parameters ranging from simple things such as wind, pressure and temperature, to more advanced quantities such as simulated radar, standard deviations, precipitable water, lightning, vertical vorticity, helicity and more. Access is available to the entire suite of parameters in GFS, HRRR, NAM and others.

Downloads are available via: a direct high speed internet connection, through the Iridium GO! as well as through the RedPort Optimizer.

LuckGrib provides access to many weather and ocean models, including: GFS, GFS Wave, GDPS/GEM, GEFS, HRRR, RAP, NAM, NBM, Icon-EU, Arpège, Arome, OpenWRF, RTOFS, NCOM and many others. These models allow you to study surface conditions, wave and swell state, ocean currents, winds at the jet stream level, mid atmosphere as well as at the boundary layer. In addition, LuckGrib allows you to explore weather model uncertainty with its support for standard deviation and probability values. LuckGrib is a thoroughly modern and advanced GRIB viewer.

See: for more details on the models and parameters that are available.

LuckGrib comes with a 14 day free trial. If you are interested in studying weather and gaining access to detailed weather forecasts, download the app and give it a try.

Downloading data via satellite or email requires the Offshore Data in-app purchase. See for more details on the remote access capabilities.

The LuckGrib weather routing system is an industry leading, high quality, robust, high performance and comprehensive system. See for more details. Access to the isochronal weather routing system requires an in-app purchase.

The LuckGrib isochronal Weather Routing solver is able to respect intermediate constraint points, the first in the industry. A constraint point is a point which a route must leave to port or starboard. Constraint points are needed to describe short routes which have crossings, as well as to express your preference on a long open ocean passage to stay to a given side of a strategic point. A simple example of a short route that needs this ability is a route which goes around an island, returning to the start point. Many sailboat race routes, perhaps the majority, have routes which cross. Two examples are Fastnet and the Around Catalina Island race. These routes can now be described in LuckGrib, and optimized Weather Routing solutions found for them.

Note that LuckGrib does not use a subscription pricing model - after the free trial, when you decide to purchase the app, there will be a one time charge, not an ongoing subscription.

For more details, please visit the support website.

* privacy policy:
* terms of use:
* end user license agreement:

What’s New

Version 4.5.4

This is a small update with various small and subtle changes sprinkled around the app.

One notable addition, mainly for sailors in the USA, is the addition of support for OFS tide height data. The OFS models are high resolution regional models around the USA, which include ocean current and tide height information. There is OFS data for a variety of regions around the USA, including the Salish Sea (including Puget Sound, the San Juans and around Vancouver Island), San Francisco Bay, Tampa, Delaware, and more.

Ratings and Reviews

4.9 out of 5
24 Ratings

24 Ratings

theweatherguy ,

Truly Excellent weather visualizer and data source

This software is a top sofware product. As a weather hobbyist for many years, I've experimented with windows and linux-based sofware to view weather grib files. But I wanted something that was easy to use, flexible and provide beautiful graphics. This product does the trick! It has most of the weather models that you will want, free data downloads that are fast and data that is up to date!With this software you can easily and accurately get the model forecast data for your exact location, day by day and hour by hour. Want to know the temperature at 3:31 PM? It will tell you! The developer clearly takes pride in his software and has been readily available to answer the few questions that I had. It comes with a 14 day free trial...once you try it, you'll love it. Glad I found this! Highly recommended!

Developer Response ,

Thank you!

WayneReview ,

Excellent and beautiful

This wonderful app lets you retrieve, manage, and display GRIB files (weather forecasts). It's well-written, the author is very responsive and personable, and it looks gorgeous.

I bought it a month or so ago and asked for a legend for values -- you can roll over points on the screen to see a detailed list of the attributes at that point which can include anything from temperature at the surface to dew point high up in the atmosphere, but when looking at the map as a whole I thought a legend would be helpful, and voila, it appeared in the latest update.

Trying to predict the weather from this professional-level data isn't super easy, but it's a very fun hobby. I'm not a sailor, and for offshore sailboat people I'd say this app is an essential.

Developer Response ,


StuffWeBuy ,

Gives me the weather data I need offshore to stay safe

I have been sailing around the world for the past 5 years using every grib viewer for the Macintosh and this is the best one out there. Not only is it fast at downloading and displaying the grib data but it also displays it more accurately than any other viewer. The developer has a background in mathematics and graphics and it shows in the care and construction of this application. When you understand how he interpolates the grid data to provide and smooth and accurate distribution between points you can appreciate his effort to get everything correct.

Developer Response ,

Thank you!

App Privacy

The developer, Craig McPheeters, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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