watchOS 26 upgrade guide: compatible Apple Watch, iPhone backup, update, first settings

Official watchOS 26 compatibility, iPhone backup, install path, and post-update checks.

When your paired iPhone shows watchOS 26, confirm your Apple Watch and iPhone are on Apple's compatibility list, back up the iPhone to iCloud (watch data rides along), then install from the Watch app or on-watch Software Update — keep both devices charged and on Wi‑Fi.

This release guide follows Apple Support for watchOS 26 upgrade steps: what shipped, which watches and iPhones qualify, iPhone backup before you update, and first settings after install. Facts come from Apple release notes only.

What watchOS 26 adds (per Apple)

Apple's "About watchOS 26 Updates" and fall 2025 platform release describe watchOS 26 as a design and health update. Highlights below come from Apple text; not every feature runs on every model or region.

Which Apple Watch and iPhone can run watchOS 26

Apple's "Apple Watch and iPhone compatibility" table lists minimum iOS and watchOS for each model. Models marked watchOS 26 or later include Apple Watch Series 11, Apple Watch SE 3, and Apple Watch Ultra 3 — each requires iPhone 11 or later with iOS 26 or later. If Software Update does not offer watchOS 26, Apple says your watch will show the newest watchOS it supports.

Back up on iPhone before you update the watch

Apple Watch does not use a separate iCloud Backup toggle — when paired, its data is stored on the iPhone and included in iPhone backups. Apple recommends backing up before major updates.

1. 1

   Update iPhone to compatible iOS first

   Install the latest iOS your iPhone supports (iOS 26 or newer when required). See our iOS 26 upgrade guide for iCloud backup and Software Update on the phone.

2. 2

   Confirm the watch is paired and syncing

   Open the Watch app on iPhone and verify the watch appears on the My Watch tab. Finish any pending sync on Wi‑Fi before starting watchOS 26.

3. 3

   Run an iCloud backup on iPhone

   Settings → your name → iCloud → iCloud Backup → Back Up Now. Stay on Wi‑Fi and power until the timestamp updates — this backup includes Apple Watch content Apple documents for paired watches.

4. 4

   Charge both devices

   Apple asks for Apple Watch at least 50% charged and iPhone on Wi‑Fi. Keep the phone near the watch for the whole update.

Install watchOS 26 (iPhone or on the watch)

Steps match Apple Support "Update your Apple Watch" and the Apple Watch User Guide "Update Apple Watch software."

1. 1

   Update tonight (optional)

   When a notification appears on Apple Watch, tap Update Tonight, then confirm on iPhone. Leave both devices charging overnight on Wi‑Fi.

2. 2

   Update with iPhone (manual)

   Watch app → My Watch → General → Software Update → Download. Enter iPhone or watch passcode if asked. Wait for the progress wheel on the watch; keep it on the charger and do not quit the Watch app.

3. 3

   Update on Apple Watch

   Connect the watch to Wi‑Fi, then Settings → General → Software Update → Install. Stay on the charger until the watch restarts on its own.

4. 4

   If iPhone demands a watch update

   Some iOS updates require a matching watchOS so Activity and health data keep syncing — follow the onscreen "Update Apple Watch" alert before finishing iPhone updates.

First settings after watchOS 26

1. 1

   Open Smart Stack and Control Center

   Swipe through Smart Stack widgets and check Control Center toggles — Liquid Glass layout changes are easiest to spot here (Apple watchOS 26 notes).

2. 2

   Review Health permissions

   Health app on iPhone → Sources → Apple Watch: confirm sleep, heart rate, and any new hypertension or sleep score alerts you expect from watchOS 26.

3. 3

   Try Workout Buddy once

   Start an outdoor walk or run and enable Workout Buddy if offered. Requires Apple Intelligence on the paired iPhone per Apple — see Apple Intelligence setup.

4. 4

   Check Messages and translation

   On supported regions and devices, try Live Translation in Messages from the watch or phone after confirming Apple Intelligence language settings.

5. 5

   Turn on automatic updates

   Watch app → General → Software Update → Automatic Updates so later watchOS 26.x security fixes install overnight on charger and Wi‑Fi.

Walk someone through update screens on figmeet · guide · features.

# Official starting points
https://support.apple.com/en-us/123002
https://support.apple.com/en-us/108926
https://support.apple.com/en-us/118490
https://support.apple.com/guide/watch/update-applewatch-software-apd105341ac3/watchos
https://support.apple.com/guide/watch/welcome/watchos
https://www.apple.com/newsroom/2025/09/new-versions-of-apples-software-platforms-are-available-today/

Install watchOS 26 only through Apple's Software Update on the watch or in the Watch app. Do not install unsigned watchOS profiles or firmware from unofficial sources.

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