Fitness watches · Model guide · Maker specs
Apple Watch Series 9
Keep Apple Watch Series 9, or buy one at a real discount: it's the oldest Series that still gets watchOS 27.
In short
Keep Apple Watch Series 9, or buy one at a real discount: it's the oldest Series that still gets watchOS 27. It has double tap, 64GB, a 2,000-nit Always-On screen, ECG and Blood Oxygen, with up to 18 hours of battery, or 36 in Low Power Mode. Skip it if you want Series 10's bigger 42mm and 46mm screens and 30-minute charge to 80%, or Series 12's new heart sensors.
Product images
Apple Watch Series 9, from its Amazon listing.
Credit: Amazon.com (Associates Program). Amazon listing
Product image from the Amazon listing.
Who it is for
- Series 9 owners. It still gets watchOS 27, and later software added a Sleep score, sleep apnea notifications and hypertension notifications.
- Buyers who find one at a real discount and want watchOS 27, ECG, Blood Oxygen and double tap in a 41mm or 45mm case, and who'll charge it every night.
- Series 8 owners who want to stay on current watchOS. Series 9 adds S9, 64GB, Siri that runs on the watch and a 2,000-nit Always-On screen.
Who should skip it
- Anyone who wants the newest health features or more battery. Series 12 has the Health Sensing System, readiness and Audio Intelligence, and Series 11 and 12 are rated for 24 hours, or 38 in Low Power Mode.
- Anyone who wants the bigger 42mm or 46mm case with the wide-angle LTPO3 screen. Series 9 is 41mm or 45mm and 10.7mm thick.
- Anyone who wants Ultra hardware. Series 9 has no Action Button, no 100m water rating or 40m dive certification, no satellite and no 3,000-nit screen.
- Anyone without an iPhone. Series 9 needs an iPhone Xs or later with iOS 17 or later, and newer watchOS versions may need a newer iOS.
What sets it apart
- The last 41mm and 45mm Series that still gets watchOS 27: Series 8 doesn't get it, and Series 10 moved to bigger 42mm and 46mm cases.
- S9 with 64GB, double tap and Siri that runs on the watch.
- A 2,000-nit Always-On screen that dims to 1 nit.
- Health features added in later software: a Sleep score, sleep apnea notifications for people 18 and older, and hypertension notifications.
- Stainless steel in gold, silver or graphite, with a sapphire front. Series 10 replaced steel with titanium.
Caveats
- Charging is slower than on newer models: about 45 minutes to 80%, against roughly 30 on Series 10 and 11, for a battery rated at 18 hours.
- Sleep apnea notifications are for people 18 and older and the ECG app for 22 and older; Blood Oxygen and temperature readings are wellness features, not medical ones.
Key specs
In the same order on every watch page, so you can compare models.
| Spec | Value | Source and notes |
|---|---|---|
| Display size | 41mm and 45mm cases; display area not published | Apple Series 9 tech specs |
| Display type | Always-On Retina LTPO OLED; Ion-X front glass on aluminum; sapphire front crystal on stainless steel | Apple Series 9 tech specsNot the wide-angle LTPO3 panel Series 10 introduced. |
| Display resolution | 326 ppi; pixel dimensions not published | Apple Series 9 tech specs |
| Peak brightness | Up to 2,000 nits peak; 1 nit minimum | Apple Series 9 tech specs |
| Always-On display | Yes; Always-On Retina LTPO | Apple Series 9 tech specs |
| Case size(s) | 41mm and 45mm | Apple Series 9 tech specs |
| Case material | Aluminum or stainless steel | Apple Series 9 tech specsNo titanium; Series 10 replaced stainless steel with titanium. |
| Case dimensions | 41mm: 41 × 35 × 10.7mm; 45mm: 45 × 38 × 10.7mm | Apple Series 9 tech specs |
| Weight | 41mm: aluminum 31.9 g (GPS) or 32.1 g (GPS + Cellular); stainless steel 42.3 g. 45mm: aluminum 38.7 g (GPS) or 39.0 g (GPS + Cellular); stainless steel 51.5 g | Apple Series 9 tech specsCase only, without a band. |
| Finishes | Aluminum: Pink, Midnight, Starlight, Silver, (PRODUCT)RED. Stainless steel: Gold, Silver, Graphite | Apple Series 9 tech specs |
| Chip / processor | S9 SiP, 64-bit dual-core processor, 4-core Neural Engine | Apple Series 9 tech specs |
| On-device storage | 64GB | Apple Series 9 tech specs |
| Battery, normal use | Up to 18 hours of normal use | Apple Series 9 tech specs |
| Battery, Low Power Mode | Up to 36 hours in Low Power Mode | Apple Series 9 tech specs |
| Charging | Magnetic Fast Charger to USB-C in the box. Up to 80% in about 45 minutes | Apple Series 9 tech specs |
| Water resistance | 50m (ISO 22810:2010); shallow-water swimming, not scuba, waterskiing or high-velocity water sports | Apple Series 9 tech specs |
| GNSS / GPS | L1 GPS, GNSS, Galileo and BeiDou | Apple Series 9 tech specsSingle-frequency, and QZSS isn't listed. The Ultras use dual-frequency L1 and L5. |
| Cellular | LTE and UMTS (plan required); no 5G RedCap | Apple Series 9 tech specs |
| Heart rate | Third-generation optical heart sensor; Heart Rate app; high and low heart rate, irregular rhythm and low cardio fitness notifications | Apple Series 9 tech specsSeries 12 and Ultra 4 have the newer Health Sensing System. |
| Blood oxygen (SpO2) | Blood Oxygen app (wellness use; results show in the Health app on iPhone) | Apple Series 9 tech specs |
| Temperature sensing | Temperature sensing with nightly wrist temperature tracking (not for medical use) | Apple Series 9 tech specs |
| ECG | ECG app (ages 22 and up; similar to a single-lead ECG) | Apple Series 9 tech specs |
| Sleep tracking | Sleep tracking; Sleep score; sleep apnea notifications; Vitals app (heart rate, respiratory rate, wrist temperature, sleep duration) | Apple Series 9 tech specsThe Sleep score and sleep apnea notifications came in later software. |
| Workout types | Dedicated running, hiking, cycling and swimming tools, plus a “More Workouts” list | Apple Series 9 tech specs |
| Other sensors | Compass; always-on altimeter; high-g accelerometer; high-dynamic-range gyroscope; ambient light sensor; no depth gauge | Apple Series 9 tech specs |
| Durability | 50m water resistance; IP6X dust resistance; no MIL-STD rating | Apple Series 9 tech specs |
| Safety alerts | Emergency SOS; international emergency calling; Crash Detection; Fall Detection | Apple Series 9 tech specs |
| Operating system | Launched with watchOS 10; gets watchOS 27, which runs on Series 9 or later | Apple Newsroom, 2023-09-12; Apple Newsroom, Series 12 launch (watchOS 27 devices) |
| Phone compatibility | iPhone Xs or later with iOS 17 or later; newer watchOS versions may need a newer iOS | Apple Series 9 tech specs |
| Wireless (Wi-Fi / Bluetooth) | Wi-Fi 4 (802.11n); Bluetooth 5.3; second-generation Ultra Wideband chip | Apple Series 9 tech specs |
| NFC / contactless payments | Apple Pay; GymKit | Apple Series 9 tech specs |
| Band fitting | Apple Watch band fitting (not a 22mm quick-release); one band in the box | Apple Series 9 tech specs |
| US price at launch | Starts at $399 (US) | Apple Newsroom, 2023-09-12 |
| Price band | Older flagship everyday watch ($350–$500 US launch) | Based on Apple's $399 launch price |
| Announced | 12 September 2023 | Apple Newsroom |
| Availability | Orders from 12 September 2023; stores from Friday, 22 September 2023; since replaced by Series 10, 11 and 12; still gets watchOS 27 | Apple Newsroom, 2023-09-12 |
Apple Watch Series 9 extras
Specs only this model has.
| Spec | Value | Source and notes |
|---|---|---|
| Hypertension notifications | Yes, added in later software; Apple's Series 11 announcement listed them for Series 9 and later and Ultra 2 and later, with watchOS 26 | Apple Series 9 tech specs; Apple Newsroom, Series 11 launch |
| Sleep apnea notifications | Yes, added in later software; for people 18 and older, flagging signs of moderate to severe sleep apnea | Apple Series 9 tech specs |
| Depth gauge | No; Series 10 added a depth gauge and water-temperature sensor | Apple Series 9 tech specs |
| Health Sensing System | No; Series 9 uses the third-generation optical heart sensor and the electrical heart sensor | Apple Series 9 and Series 12 tech specs |
| Wide-angle LTPO3 screen | No; Always-On LTPO only. Series 10 introduced wide-angle LTPO3 | Apple Series 9 and Series 10 tech specs |
| Wrist fit | 41mm fits 130–200mm wrists; 45mm fits 140–245mm wrists | Apple Series 9 tech specs |
| Gestures | Double tap; Siri with on-device processing | Apple Series 9 tech specs |
| In the box | Apple Watch Series 9; band; Magnetic Fast Charger to USB-C (1m) | Apple Series 9 tech specs |
| Apple Watch For Your Kids | Supported on cellular models (not every feature) | Apple Series 9 tech specs |
| Operating range | 0°C to 35°C; altitude 0–3,000m | Apple Series 9 tech specs |
| Accessibility features | VoiceOver, Zoom, AssistiveTouch, Type to Siri, RTT and others Apple lists | Apple Series 9 tech specs |
Series 9 against the newer models
Series 10 is the bigger change: a larger wide-angle screen and faster charging at the same $399 launch price. Series 11 added the longer battery, and Series 12 the Health Sensing System.
| Spec | Series 9 | Series 10 | Series 11 |
|---|---|---|---|
| Case | 41mm or 45mm; aluminum or stainless steel | 42mm or 46mm; aluminum or titanium | 42mm or 46mm; aluminum or titanium |
| Screen | Always-On LTPO, 2,000 nits | Wide-angle LTPO3, 2,000 nits | Wide-angle LTPO3, 2,000 nits |
| Battery, normal and Low Power Mode | 18 and 36 hours | 18 and 36 hours | 24 and 38 hours |
| Charge to 80% | About 45 minutes | About 30 minutes | About 30 minutes |
| Chip | S9 | S10 | S10 |
| watchOS 27 | Yes | Yes | Yes |
| US launch price | $399 (2023) | $399 (2024) | $399 (2025) |
Health and sleep
Series 9 has the third-generation optical heart sensor, with high and low heart rate, irregular rhythm and low cardio fitness notifications, and the electrical heart sensor for the ECG app. It also measures Blood Oxygen and tracks your wrist temperature nightly. The Vitals app brings heart rate, respiratory rate, wrist temperature and sleep duration together, and the Sleep score, sleep apnea notifications and hypertension notifications came later in software updates.
Battery and charging
| Mode | Series 9 |
|---|---|
| Normal use | Up to 18 hours |
| Low Power Mode | Up to 36 hours |
| GPS workout | Not published |
| Fast charge | About 80% in 45 minutes |
Apple gives no 15-minute figure for Series 9; Series 10 and 11 list 15 minutes for about 8 hours. The 1m Magnetic Fast Charger to USB-C cable comes in the box.
Screen, case and water
The display is the older Always-On LTPO panel rather than the wide-angle LTPO3 that Series 10 introduced, at 326 ppi, up to 2,000 nits and down to 1 nit. Aluminum models have an Ion-X front and stainless steel models sapphire. Both sizes are 10.7mm thick; Apple fits the 41mm to 130–200mm wrists and the 45mm to 140–245mm. Series 9 is water resistant to 50m for shallow-water swimming and dust-rated IP6X, with no depth gauge.
Software and iPhone
Series 9 launched with watchOS 10 and gets watchOS 27. It needs an iPhone Xs or later with iOS 17 or later, and newer watchOS versions may need a newer iOS. Double tap and Siri with on-device processing are built in, and cellular models support Apple Watch For Your Kids, though not with every feature.
Price
Series 9 launched at $399 in the US and reached stores on 22 September 2023. Series 10 and Series 11 launched at the same $399 with bigger screens and faster charging, so a Series 9 makes sense only well below that.
Sources
- Amazon product listing — accessed 2026-09-20
- Apple Support — Apple Watch Series 9 tech specs (111833) — accessed 2026-09-19
- Apple Newsroom — Apple introduces the advanced new Apple Watch Series 9 — accessed 2026-09-19
- Apple — Guidelines for Using Apple Trademarks and Copyrights — accessed 2026-09-19
Frequently asked questions
Does Series 9 get watchOS 27?
Yes. Series 9 is the oldest Series that gets it, alongside SE 3 and Ultra 2 or later. It launched with watchOS 10.
Does Series 9 have the Health Sensing System?
No. It uses the third-generation optical heart sensor and the electrical heart sensor. The Health Sensing System and the readiness score are on Series 12 and Ultra 4.
What's the screen resolution?
Apple gives only the pixel density for Series 9: 326 ppi. Some retailer listings quote 352 × 430 and 396 × 484 pixels, but Apple doesn't confirm those figures, or the display area, for Series 9.
Does Series 9 have a depth gauge or 5G?
No. There's no depth gauge, and its cellular models use LTE and UMTS rather than 5G RedCap. Series 10 added a depth gauge and a water-temperature sensor.
Does Series 9 get sleep apnea and hypertension notifications?
Yes, through later software. Sleep apnea notifications are for people 18 and older, and Apple listed hypertension notifications for Series 9 and later with watchOS 26.
How much did Series 9 cost?
$399 in the US at launch, on 12 September 2023, the same starting price as Series 10 and Series 11 a year and two years later. It has since been replaced, so today's price depends on the seller.
Official product page: Apple Watch Series 9. Tech specs: Apple Watch Series 9 specs.