The Cumulus MX weather program
Publisher’s description
What is Cumulus MX?
Cumulus MX by Cumulus MX is open-source Windows software. It is written in C#.
Installation and requirements
The publisher provides Portable installers for 64-bit and 32-bit Windows. It runs without installation (portable).
Updates and version history
The current version is 5.1.6, released on September 17, 2026. The version history goes back to April 1, 2025: 18 releases, all linked to the official files. That is about 12 releases a year.
Popularity and file types
The source code on GitHub (cumulusmx/CumulusMX) has 109 stars.
Project description on GitHub: “The Cumulus MX weather program”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Frequent updates (about 12 a year)
Cons
- No native ARM64 build
In short: Cumulus MX is an open-source Windows tool for 64-bit and 32-bit PCs. It is actively maintained.
Is Cumulus MX safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
C5FB00DF0B08BA62352E4A446DB39CB6E2FF1B775B0167B5FE0BD611CD6F03AD· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 18 versions ›18 versions over 1 year · about 12 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 5.1.6Latest | September 17, 2026 | — | 32-bit ZIP64-bit ZIP |
| 5.1.5 | July 22, 2026 | — | 32-bit ZIP64-bit ZIP |
| 5.1.4 | June 10, 2026 | — | 32-bit ZIP64-bit ZIP |
| 5.1.3 | May 26, 2026 | — | 32-bit ZIP64-bit ZIP |
| 5.1.1 | May 17, 2026 | — | 64-bit ZIP32-bit ZIP |
| 5.1.0 | May 7, 2026 | — | 64-bit ZIP32-bit ZIP |
| 5.0.1 | April 3, 2026 | — | 32-bit ZIP64-bit ZIP |
| 5.0.0 | March 27, 2026 | — | 32-bit ZIP64-bit ZIP |
Install from the command line
Silent install ›winget install --id CumulusMX.CumulusMX -eRelated guide: How to use winget: install and update apps
Information
- Publisher
- Cumulus MX
- Licence
- GPL-3.0
- Price
- Free
- Source code
- github.com/cumulusmx/CumulusMX
- Written in
- C#
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, 32-bit
- Installer
- Portable
- Version
- 5.1.6
- Released
- September 17, 2026
- Added to the catalogue
- April 14, 2025
- Versions listed
- 18
- Updates / year
- 12.3
- GitHub stars
- 109
- GitHub forks
- 30
- Website
- github.com
- winget ID
- CumulusMX.CumulusMX
Ratings and reviews
No reviews yet. Be the first to rate it.
Frequently asked questions
Is Cumulus MX free?
Yes. Cumulus MX is open-source software under the GPL-3.0 licence.
Is Cumulus MX safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Cumulus MX with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does Cumulus MX run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit and 32-bit version through emulation.
Where can I download an older version of Cumulus MX?
The versions page lists all 18 versions with links to their official installer files, back to April 1, 2025.
Can I use Cumulus MX without administrator rights?
Yes, it is portable: unpack and run it.