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Apple Apple Watch Series 12 42mm

42 mm37 mm9.7 mm
Released
2026-09-18Apple UK Newsroom — Apple Watch Series 12, retrieved 2026-09-13
Price
£369Apple UK store, retrieved 2026-09-13

The Apple Watch Series 12 42mm went on sale on 18 September 2026. The Apple UK store price is £369 (read 13 September 2026). It has a weight of 32.2 g, the S11 SiP chip and 64 GB of storage to start. Apple claims up to 24 hours per charge. Apple publishes no end date for its security updates. Every figure in the Apple Watch Series 12 42mm specifications below links the page it came from and the date it was read.

Battery life (maker's claim)

24h

Official

Case size

42mm

Official

Weight (case only)

32.2g

Official

Water rating

Water resistance 50m (swimproof) under ISO standard 22810:2010

Official

Works with

Works with an iPhone only.

Apple’s own words: “iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later”Apple UK — Apple Watch Series 12 Tech Specs, retrieved 2026-09-13

UK networks whose own pages list eSIM support for the cellular model: EE, Vodafone, Three.Vodafone UK — eSIM-compatible devices, retrieved 2026-09-13

Specifications

Every figure carries its source, linked and dated.

Body

Dimensions
42 x 37 x 9.7 mmOfficial
Case size
42mmOfficial
Case shape
rectangularOfficial
Weight (case only)
32.2gOfficial
Case material
AluminiumOfficial
Water rating
Water resistance 50m (swimproof) under ISO standard 22810:2010Official

Display

Display type
Always-On Retina display with wide-angle OLEDs and LTPO3Official
Display area
970mm²Official
Resolution
374 x 446Official
Peak brightness
2000nitsOfficial
Always-on display
YesOfficial

Platform

Operating system
watchOS 27Official

Apple UK Newsroom — Apple Watch Series 12, published 2026-09-09 · retrieved 2026-09-13

Chip
S11 SiPOfficial
Storage
64GBOfficial

Battery

Battery life (maker's claim)
24hOfficial
Charge to 80%
30minOfficial
Charging
Fast-charge capable, Apple Watch Magnetic Fast Charger to USB-C CableOfficial

Health

Sensors
Health Sensing System (third-generation electrical heart sensor, always-on optical heart sensor, blood oxygen sensor, temperature sensor), compass, always-on altimeter, high-g accelerometer, high dynamic range gyroscope, ambient light sensor, depth gauge to 6 metres, water temperature sensorOfficial
ECG
YesOfficial
Blood oxygen
YesOfficial
Skin temperature
YesOfficial
GPS
Precision L1 GPS (GPS, GLONASS, Galileo, QZSS and BeiDou)Official

Connectivity

Cellular model
YesOfficial
UK networks with eSIM
EE, Vodafone, Three3rd party
Wi-Fi
Wi-Fi 4 (802.11n)Official
Bluetooth
5.3Official
NFC payments
YesOfficial

Compatibility

Works with
iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or laterOfficial
Compatibility
iPhone onlyOfficial
6 attributes without a sourced figure yet

Strap width · Display size · RAM · Battery capacity · Blood pressure · Cellular model price. A gap in our data, not a statement about the watch — rows appear as sources are cited.

Software support

Feature updates until
Not published by the maker
Security updates until
Not published by the maker

Basis: our inference from history

Apple's watchOS 27 page (read 2026-09-22) lists the Apple Watch Series 12 among the models watchOS 27 supports; watchOS 27 was released on 14 September 2026. Apple publishes no forward date for watchOS or security support.

Apple UK — watchOS 27 compatible models, retrieved 2026-09-22

Comparisons

The pairs a buyer of this watch would weigh, row by row with a verdict on each. Any other watch in the catalogue is a chooser away.

Against its own line

Against other Apple watches

Against other makers