UV Index on Apple Watch: Complications, Widgets & Burn Time

Apple Watch is arguably the most useful place to see the UV index — it's already on your wrist, you don't need to reach for your phone, and a good watch face complication turns UV awareness into a habit. This guide covers how to check the UV index on Apple Watch, how to add a UV complication to your watch face, and why a dedicated UV forecast app gives you a much more useful reading than the built-in Weather app.

Can Apple Watch show the UV index?

Yes — Apple Watch can show the UV index, but it depends on which app is providing the data. Apple's built-in Weather app on watchOS does surface a daily UV level inside the app, but it doesn't ship with a dedicated UV index complication you can put directly on your watch face. The UV number is buried one tap deep.

A dedicated UV forecast app like Sunwise fills that gap. It installs a native watchOS companion app on your Apple Watch, adds UV index complications for most watch face families (Modular, Infograph, Meridian, and more), and contributes a UV widget to the Smart Stack — so the current UV level is always one glance away.

How to add a UV index complication to your Apple Watch

  1. 1.Install a UV forecast app like Sunwise on your iPhone. The watchOS companion app installs automatically on your paired Apple Watch.
  2. 2.On your Apple Watch, press and hold the current watch face, then tap Edit.
  3. 3.Swipe to the complications screen, tap a complication slot, and scroll the list to find the UV forecast app.
  4. 4.Choose the complication style that fits your slot. A circular complication usually shows the UV number; a rectangular one can show UV plus a burn time label.
  5. 5.Press the Digital Crown to save. Your new UV index complication now updates throughout the day.

If you prefer not to customise a watch face, swipe up from the bottom of your face to open the Smart Stack, press and hold, tap the plus button, and add a UV index widget. Smart Stack widgets surface automatically based on time of day and context.

What Apple Watch UV complications should show

A good UV complication goes beyond just surfacing a number. On a glanceable surface like the watch face, three pieces of information matter most:

  • •Current UV index — the real-time value at your GPS location, not a daily average.
  • •Personalized burn time — how many minutes you can stay in the sun based on your Fitzpatrick skin type. This is what makes a UV reading actionable.
  • •Peak UV time hint — when the UV index will reach its daily maximum, so you can plan outdoor activities around it.

Sunwise's Apple Watch complications are designed around this idea: instead of just showing a bare UV number, they pair the index with a burn time calculated for your skin type — so the complication answers a real question ("how long can I stay outside?") rather than just displaying data. For context on what each UV number means, see our UV index guide.

Apple's Weather app vs a dedicated UV forecast app

Apple's Weather app on Apple Watch gives you a daily UV number but no native complication and no personalization — the same reading is shown to everyone regardless of skin type. On an Apple Watch face where every complication slot matters, UV data that isn't actionable usually loses its slot to something that is.

A dedicated UV forecast app solves both problems. It ships with a native watchOS app, provides complications for the common watch face families, and — crucially — shows a UV reading that's personalized to you. Fair skin (Fitzpatrick Type I–II) burns dramatically faster than darker skin (Type V–VI) at the same UV level, so a personalized burn time is the only reading that tells you what to actually do next. To see how to check the UV index on iPhone as well, read our iPhone UV index guide.

Which Apple Watch faces work best for UV?

Any watch face that supports complications can display a UV reading, but a few are especially well-suited for it:

  • •Modular — the large rectangular complication shows UV index plus burn time side-by-side.
  • •Infograph — four corner slots plus a sub-dial give you room to combine UV with weather, rings, and calendar at once.
  • •Meridian — a cleaner look where a small circular UV complication pairs well with minimal typography.
  • •Smart Stack — if you don't want to commit a complication slot, the UV widget appears automatically when the UV index is rising.

Get the UV index on your Apple Watch with Sunwise

Sunwise is a personalized UV forecast app for iPhone, iPad, and Apple Watch. The watchOS companion adds UV index complications and a Smart Stack widget that pair the real-time UV level with a burn time calculated for your skin type — so you know at a glance how long you can safely stay in the sun.

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