What Changed in watchOS 27.0.1
Apple published no developer release notes for watchOS 27.0.1, which is normal for a release that carries security fixes and nothing an app would notice. Nobody outside Apple can list its changes, and this page will not invent them.
watchOS 27.0.1 shipped as build 24R365 on September 28, 2026.
watchOS 27.0.1 Build Numbers
watchOS 27.0.1 is build 24R365 on every device that runs it. To check what you are on, open the Watch app on your iPhone → General → About and tap the version number.
Apple shipped it alongside iOS 27.0.1, iPadOS 27.0.1, macOS 27.0.1, visionOS 27.0.1 the same day — the platforms move together even when the build numbers do not match.
| Platform | Version | Build | Released |
|---|---|---|---|
| watchOS | 27.0.1 | 24R365 | September 28, 2026 |
| iOS | 27.0.1 | 24A446 | September 28, 2026 |
| iPadOS | 27.0.1 | 24A446 | September 28, 2026 |
| macOS | 27.0.1 | 26A434 | September 28, 2026 |
| visionOS | 27.0.1 | 24M372 | September 28, 2026 |
Which Devices Run watchOS 27.0.1
watchOS 27.0.1 runs on every device that runs watchOS 27: 6 models. A point release never changes the supported list — if watchOS 27 reached your device, watchOS 27.0.1 does too.
The 5 models that stopped at the previous version stay there, on security updates. The full compatibility list covers every platform, and this checker answers it for one device.
- Apple Watch Series 11
- Apple Watch Series 10
- Apple Watch Series 9
- Apple Watch Ultra 3
- Apple Watch Ultra 2
- Apple Watch SE 3
How to Install watchOS 27.0.1
Open the Watch app on your iPhone → General → Software Update → Beta Updates and install it like any other update. There is nothing to download first and no profile involved — Apple removed beta profiles in 2023, and a shipped release never needed one anyway.
If the update does not appear, it is usually one of three things: the rollout has not reached your device yet (Apple releases in waves over a few days), the device is below the storage the installer needs, or it is enrolled in a beta channel that is already ahead of this version. Our guide to an update that will not show up works through each.
Frequently Asked Questions
What's new in watchOS 27.0.1?
Apple published no release notes for watchOS 27.0.1. It carries the usual security fixes, and no feature list exists — any site publishing one is guessing.
When was watchOS 27.0.1 released?
September 28, 2026.
What is the build number for watchOS 27.0.1?
24R365. Settings → General → About, then tap the version number to see it.
Should I update to watchOS 27.0.1?
It is a shipped release rather than a beta, so the usual beta cautions do not apply: apps are built against it and it carries the security fixes of everything before it. The one reason to wait is a device you cannot afford to be without for an hour. Back up first either way.
Can I go back to the previous version after installing watchOS 27.0.1?
Only to a build Apple is still signing, and only by erasing the device and restoring from an IPSW.
Does watchOS 27.0.1 fix battery drain?
Heavy battery use for a day or two after any update is re-indexing, not a fault, and it settles. Apple published no notes for watchOS 27.0.1, so nobody outside Apple can say.
Is there a beta profile for watchOS 27.0.1?
No, and there is nothing to install: watchOS 27.0.1 is a public release that arrives through Software Update. Apple removed beta profiles in 2023.
What came after watchOS 27.0.1?
watchOS 27.2, on October 26, 2026. Its page has the same detail.