"It's the best Mac weather app."
-- John Gruber, Daring Fireball

Seasonality Core 2.0 is a Mac app any weather aficionado should have. That's because it's probably the most complete and detailed weather software I've ever seen on the Mac.
-- The Unofficial Apple Weblog

I'm a big fan of good weather-reporting software for years but never thought I'd find nirvana so easily. No weather program I've ever tried, for Windows, Linux or OS X, comes within a light year of Seasonality.
-- Al Fasoldt, The Post-Standard, Syracuse, NY.

Seasonality becomes your weather center. It does everything but control the weather.
-- Mac360


Seasonality Core is the complete weather center for your Mac. View weather at any of the 34,000 built-in locations in more than 200 countries, or add your own custom weather location to view even more precise data. Seasonality gives you an accurate 7 day forecast, graphs of past weather conditions, a custom satellite/radar image, and much more.

Seasonality Core's graphs are excellent at showing how weather conditions are changing over days, months, or even years. Seasonality Core will automatically collect and store weather data indefinitely.

The custom satellite/radar image gives users the option to adjust opacity of both overlays, show the latest North American surface analysis, and view the global wind flow with Particle Mode.

Seasonality Core has a solid foundation from being in development for more than 10 years. We always welcome feedback, and have made countless improvements to the software over the years based on user suggestions. If Seasonality Core is missing something, we want to hear about it! Send your feedback to our support email.

What’s New

Version 2.6.1

• Fixed a bug where locations wouldn't be saved.
• Fixed a bug where data wouldn't load automatically.
• Load more weather data over secure web connections.

Ratings and Reviews

David Mathiasen ,

Basic Program

Weather radar data is avaiable free of charge, NOAA's site has powerful resourses for viewing and manipulating radar data,

I do like the interface of Seasonality Core however the radar map is very cumbersom and you cannot customize the "feel" as much as I would like, especially with a price point over $20 USD - The loop feature is very buggy and shudders & studders quite a lot.

I would recommend this program for the very basic weather enthusiast but would not recommend it for anyone with even the slightest technical knowledge of meteorology or the manipulation of weather data

markn455 ,

Professional & Informative

This is one of the best desktop weather information programs I have found. I would rate it 5 stars this five stars however the program has not been updated in over a year. They talked about some really great features coming a year ago and here we are. I think the program is well worth the price in its current state. I don’t like to spend money on products if I am not confident they are going to be fixing bugs and adding features etc.

AKFarmer ,

Used to work good, but now won’t load

I downloaded this app back when it was known only as “Seasonality” and have depended on it for both data collection and for weather forecasts. However, a week ago it stopped loading and I no longer have access to any of my data. I sent a request for assistance in to Gaucho but after over a weekwaiting I have not yet had any response. This is disappointing as the program was the best I had found.


Gaucho Software, LLC.
6.5 MB

OS X 10.7.0 or later, 64-bit processor



Age Rating


  • Family Sharing

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

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