Apple Watch SE 3 is Apple’s 2025 entry-level smartwatch, with an Always-On display, S10 chip, fast charging, and new sleep- and temperature-related features. It comes in 40 mm and 44 mm aluminum cases, with GPS or GPS + Cellular; Apple lists the U.S. starting price at $249. Its current compatibility requirement is an iPhone 11 or later, including iPhone SE (2nd generation or later), running iOS 27 or later.
Apple Watch SE 3 at a glance
| Feature | Apple Watch SE 3 |
|---|---|
| Announced / available | September 9, 2025 / September 19, 2025 |
| U.S. starting price | $249 listed by Apple; prices may vary |
| Case sizes and colors | 40 mm or 44 mm aluminum; Midnight or Starlight |
| Display | Always-On Retina OLED LTPO; up to 1,000 nits peak brightness and 2 nits minimum |
| Chip and storage | S10 64-bit dual-core processor, four-core Neural Engine, 64 GB capacity |
| Connectivity | GPS or GPS + Cellular; cellular models support LTE and 5G RedCap, subject to carrier, plan, and geography |
| Health and sleep | Second-generation optical heart sensor, temperature sensor, sleep stages and score, sleep-apnea notifications, and cycle-tracking features |
| Battery estimate | Up to 18 hours normal use; up to 32 hours in Low Power Mode |
| Water resistance | 50 meters; Apple describes it as swimproof |
| iPhone compatibility | iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later |
What’s new in Apple Watch SE 3?
Compared with the previous SE generation, Apple adds an Always-On display, S10 chip, 64 GB capacity, fast charging, wrist-temperature sensing, Sleep Score, sleep-apnea notifications, retrospective ovulation estimates, and 5G capability on supported cellular models. These are product specifications and features; the dossier contains no independent performance testing.
- Always-On display: The screen can remain visible when your wrist is lowered.
- Fast charging: Apple estimates charging to up to 80% in about 45 minutes.
- More sleep and cycle information: Features include sleep stages, Sleep Score, temperature-related cycle tracking, and sleep-apnea notifications.
- S10 controls: Apple lists single tap, Double Tap, and Wrist Flick gestures, as well as Siri powered by Apple Intelligence. Availability may depend on device, language, and region.
Sizes, fit, and design
Apple offers Midnight and Starlight aluminum cases in 40 mm and 44 mm sizes. The 40 mm model is 34 mm wide and 10.7 mm deep, has a 324-by-394-pixel display, and fits wrists measuring 130–200 mm. The 44 mm model is 38 mm wide and 10.7 mm deep, has a 368-by-448-pixel display, and fits wrists measuring 140–245 mm.
| Case size | Width and depth | Display resolution | Listed weight | Wrist fit |
|---|---|---|---|---|
| 40 mm | 34 mm × 10.7 mm | 324 × 394 pixels | 26.3 g GPS; 26.4 g GPS + Cellular | 130–200 mm |
| 44 mm | 38 mm × 10.7 mm | 368 × 448 pixels | 32.9 g GPS; 33.0 g GPS + Cellular | 140–245 mm |
Choose based on wrist fit and whether you prefer a larger display. Apple Watch SE 3 includes a removable band; check the exact case-size compatibility when buying a replacement band.
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![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31YiTby0pOL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Display, chip, and controls
The Always-On Retina OLED LTPO display is specified at up to 1,000 nits peak brightness and 2 nits minimum brightness. Apple lists an S10 64-bit dual-core processor, a four-core Neural Engine, and 64 GB capacity. The watch also has a Digital Crown with haptic feedback and a side button.
Apple lists single tap, Double Tap, and Wrist Flick gestures. These provide additional ways to control selected actions, but do not replace every touchscreen interaction. Siri and software features may depend on the paired device, language, and region.
Health and sleep features
Apple lists a second-generation optical heart sensor and a temperature sensor. Health and sleep features include high- and low-heart-rate notifications, irregular-rhythm notifications, sleep stages and Sleep Score, sleep-apnea notifications, and cycle-tracking functions such as fertile-window and retrospective ovulation estimates. Apple also lists perimenopause and menopause support.
Sleep Score and sleep-apnea notifications
Sleep Score summarizes sleep information, while sleep-apnea notifications look for possible signs based on watch data. These are features and notifications, not diagnoses or substitutes for medical care. If a notification concerns you, consult a qualified healthcare professional.
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Temperature and cycle tracking
The temperature sensor contributes to Vitals data and cycle tracking, including retrospective ovulation estimates. It is not a general-purpose thermometer, and estimates are not direct measurements or contraception guarantees.
Health features the SE 3 does not list
The dossier does not list ECG functionality or blood oxygen monitoring for this model. If a particular medical or health feature is essential, verify its availability for the exact model and region before buying.
Rank #2
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31Gq8SToFJL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Fitness and safety
Apple lists custom workouts, workout views, training load, heart-rate zones, VO₂ max, race route, pacer, and running metrics including cadence, stride length, ground contact time, vertical oscillation, and running power. The workout list includes activities such as walking, rowing, HIIT, yoga, strength training, Pilates, swimming, and multisport.
Listed safety functions include Emergency SOS, international emergency calling, Fall Detection, Crash Detection, noise monitoring, Backtrack, and Check In. These are not guarantees of emergency detection or response; operation can depend on region, setup, connectivity, and circumstances.
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GPS or GPS + Cellular?
| Configuration | What to consider |
|---|---|
| GPS | Suitable if you generally use the watch near your iPhone and want built-in GPS for workouts. |
| GPS + Cellular | Adds cellular connectivity, including LTE and 5G RedCap support. Service depends on carrier, plan, and geography and may involve extra charges. |
Choose based on whether you want connectivity away from your iPhone and whether your carrier supports the watch. Apple’s listed cellular capability does not guarantee service in every location.
Battery, charging, and water resistance
Apple estimates up to 18 hours of normal-use battery life, up to 32 hours in Low Power Mode, and up to seven hours of outdoor workout use. Apple says a 15-minute charge can provide up to eight hours of normal use, and lists fast charging to up to 80% in about 45 minutes. These are Apple estimates, not independent test results; actual battery life varies with use and conditions.
Apple lists 50-meter water resistance and describes the watch as swimproof. That rating should not be taken as suitability for every water sport or exposure. Check Apple’s care guidance for activity-specific limits.
Compatibility and what’s in the box
As of October 7, 2026, Apple’s current specifications list iPhone 11 or later, including iPhone SE (2nd generation or later), running iOS 27 or later. Software requirements can change, so confirm compatibility before buying or setting up the watch.
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![Apple Watch SE 3 [GPS 44mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - M/L. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41IZwhp9VXL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Apple lists the box contents as Apple Watch SE 3, a band, and an Apple Watch Magnetic Fast Charger to USB-C Cable (1 m).
Materials and environmental claims
Apple reports that Apple Watch SE 3 contains 40% recycled content. Apple identifies recycled aluminum in the case, recycled cobalt and lithium in the battery, and recycled materials in magnets and other components; Apple also describes the packaging as fiber-based. These are Apple’s product claims, not independent lifecycle findings.
Price and choosing a configuration
Apple’s U.S. product page lists Apple Watch SE 3 from $249. This is not a guaranteed transaction price: retail prices, configurations, and availability can vary by location and over time.
- Choose a size: Compare wrist fit and display size using Apple’s listed measurements.
- Choose connectivity: Select GPS + Cellular only if you need cellular service away from your iPhone and your carrier supports it.
- Check your iPhone: Confirm that your iPhone model and iOS version meet Apple’s current requirements.
- Prioritize features: Consider whether the listed sleep, cycle-tracking, fitness, and safety features meet your needs.
Is Apple Watch SE 3 worth it?
It is worth considering if you want an Always-On display, S10 chip, fast charging, current sleep and cycle-tracking features, and a choice of case size and connectivity. The dossier does not provide independent performance comparisons, so treat battery and feature claims as Apple’s specifications and estimates.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Before buying, compare the exact features you need, your iPhone compatibility, cellular requirements, and the price available to you. For health-related decisions, remember that watch notifications and estimates are not medical diagnoses.
FAQ
When did Apple Watch SE 3 come out?
Apple announced it on September 9, 2025, and availability began September 19, 2025.
Rank #4
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
What’s new in Apple Watch SE 3?
Apple added an Always-On display, S10 chip, fast charging, wrist-temperature sensing, Sleep Score, sleep-apnea notifications, retrospective ovulation estimates, and 5G capability on supported cellular models.
What iPhone do I need for Apple Watch SE 3?
As of October 7, 2026, Apple lists iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later.
How long does the Apple Watch SE 3 battery last?
Apple estimates up to 18 hours of normal use, up to 32 hours in Low Power Mode, and up to seven hours of outdoor workout use. Actual results vary.
What’s the difference between GPS and GPS + Cellular?
GPS + Cellular adds cellular connectivity, including LTE and 5G RedCap support, where supported by a carrier, plan, and geography. GPS is the simpler choice if you usually have your iPhone nearby.
Can Apple Watch SE 3 diagnose sleep apnea?
No. It can issue notifications about possible signs based on watch data, but these are not a diagnosis or a substitute for medical care.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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