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Apple Apple Watch SE 3 40mm

40 mm34 mm10.7 mm
Released
2025-09-19Apple Newsroom — Apple Watch SE 3, retrieved 2026-09-13
Price
£219Apple UK store, retrieved 2026-09-13

The Apple Watch SE 3 40mm went on sale on 19 September 2025. The Apple UK store price is £219 (read 13 September 2026). It has a weight of 26.3 g, the S10 SiP chip and 64 GB of storage to start. Apple claims up to 18 hours per charge. Apple publishes no end date for its security updates. Every figure in the Apple Watch SE 3 40mm specifications below links the page it came from and the date it was read.

Battery life (maker's claim)

18h

Official

Case size

40mm

Official

Weight (case only)

26.3g

Official

Water rating

Water resistance 50m (swimproof)

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 SE 3 Tech Specs, retrieved 2026-09-13

UK networks whose own pages list eSIM support for the cellular model: EE, Vodafone, O2, Three.Vodafone UK — eSIM-compatible devices, retrieved 2026-09-13

Specifications

Every figure carries its source, linked and dated.

Body

Dimensions
40 x 34 x 10.7 mmOfficial
Case size
40mmOfficial
Case shape
rectangularOfficial
Weight (case only)
26.3gOfficial
Case material
AluminiumOfficial
Water rating
Water resistance 50m (swimproof)Official

Display

Display type
Always-On Retina display with OLED and LTPOOfficial
Display area
759mm²Official
Resolution
324 x 394Official
Peak brightness
1000nitsOfficial
Always-on display
YesOfficial

Platform

Operating system
watchOS 26Official

Apple Newsroom — Apple Watch SE 3, published 2025-09-09 · retrieved 2026-09-13

Chip
S10 SiPOfficial
Storage
64GBOfficial

Battery

Battery life (maker's claim)
18hOfficial
Charge to 80%
45minOfficial
Charging
Fast-charge capable, Apple Watch Magnetic Fast Charger to USB-C CableOfficial

Health

Sensors
Second-generation optical heart sensor, temperature sensor, compass, always-on altimeter, high-g accelerometer, high dynamic range gyroscope, ambient light sensorOfficial
ECG
NoOfficial
Blood oxygen
NoOfficial
Skin temperature
YesOfficial
GPS
L1 GPS (GLONASS, Galileo, QZSS and BeiDou)Official

Connectivity

Cellular model
YesOfficial
UK networks with eSIM
EE, Vodafone, O2, 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.

What it actually costs

New against used, and what the same shop pays for the watch on your wrist.

New

recommended retail

£219

Apple UK store, retrieved 2026-09-13

Used, Grade A

£160

CeX, read 2026-10-04 · repriced 2026-07-14

Used, Grade B

£120

CeX, read 2026-10-04 · repriced 2026-07-14

Used, Grade C

£100

CeX, read 2026-10-04 · repriced 2026-07-14

Trade in yours, Grade A

£102cash£118voucher

CeX, read 2026-10-04 · 16% more as store credit

Prices move; these were read on 2026-10-04. Used and trade-in figures are CeX's own, for an unlocked handset at this device's base storage. We hold no stock and take no commission.

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 SE 3 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