Apple Watch Time in Daylight, explained
Since watchOS 10, Apple Watch can estimate how much time you spend outdoors in daylight. The number is easy to misread, sits a few taps deep in the Health app and needs two settings to work.
What is Time in Daylight on Apple Watch?
Since watchOS 10, the ambient light sensor in your Apple Watch estimates how long you were outdoors in daylight each day. You find the value in the Health app on your iPhone under Browse, then Other Data. It is a time, not a brightness, and research names no single number of minutes for everyone (Piper et al., 2026).
How does Apple Watch measure Time in Daylight?
According to Apple, the ambient light sensor in your Apple Watch automatically estimates how much time you spend outdoors in daylight each day. Apple describes it as an estimate.
The value is a time, not a brightness. It tells you how long you were out, not how much light reached your eyes.
Where is Time in Daylight in the Health app?
According to Apple, you see the values on your iPhone in the Health app.
- Open the Health app on your iPhone.
- Tap Browse, then Other Data.
- Tap Time in Daylight.
Why is Time in Daylight not working?
Apple names two settings that need to be on. Apple documents the feature from watchOS 10 onward, so on an older version the entry may be missing.
- Motion Calibration & Distance: on your iPhone in Settings, Privacy & Security, Location Services, System Services.
- Time in Daylight itself: on your Apple Watch in Settings, Privacy & Security, Health, Time in Daylight. On your iPhone you find the same switch in the Apple Watch app under My Watch, Privacy.
How much daylight is enough?
Research does not name one number of minutes that fits everyone. A 2026 policy brief says so explicitly and recommends daylight especially within the first few hours after waking (Piper et al., 2026).
An international expert panel recommends bright light during the day and dim light in the evening (Brown et al., 2022). An expert consensus adds that morning light can shift the body clock earlier and light late in the evening can shift it later (Spitschan et al., 2025).
Watch value and rule of thumb
LightOtter works without a watch. It uses the clouds and the height of the sun where you are for a rule of thumb: about 10 minutes on a clear morning, 15 when partly cloudy, 20 to 25 when overcast and up to 30 with a low sun. The watch looks back at your day, the rule of thumb looks ahead to your morning. Both are estimates, not measurements, and not medical advice. In the upcoming iPhone app, LightOtter can also show your Time in Daylight from Apple Health if you allow it. It stays on your device and does not count towards your goal or streak.
Never look directly at the sun. Apple Watch and Health are trademarks of Apple Inc.; LightOtter is not affiliated with Apple.
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