What is the best UV index app with a widget for Apple Watch?

The right choice depends on whether you want a number or an instruction. Apple's built-in Weather app surfaces a daily UV level inside the app but does not offer a dedicated UV index complication, so the reading is always a tap away rather than on the face. Among third-party options, UV Index Now (UVI Mate), UVmeter, UVLens, Sola, and Sunbeam all ship watchOS companions, and newer apps such as UV Watch lead on skin-type tips and sunscreen reminders. Sunwise's difference is what the complication displays: instead of only the current UV index, it pairs the index with a burn time in minutes calculated for your Fitzpatrick skin type, so the glance answers 'how long can I stay out' rather than 'what is the number'.

Does Apple Watch have a UV sensor?

No. No Apple Watch model, including Series 10 and Ultra, has a UV sensor. The ambient light sensor that powers Time in Daylight measures visible brightness, not ultraviolet, which is why it can tell you that you were outside but not how strong the UV was. Every UV reading on Apple Watch — in the Weather app or in a third-party complication — is a forecast for your location from a weather service, not a measurement taken on your wrist. That is also why a UV complication reads the same under a sleeve as on bare skin: it isn't reading the sky.

Can I log the UV index to Apple Health from my Apple Watch?

Not automatically. Apple Health has a UV Exposure data type, but neither Apple Weather nor Time in Daylight writes the UV index into it. The usual workaround is a Shortcuts personal automation that fetches the current weather, reads the UV index, and logs it to Health on a schedule or when you arrive somewhere — it works, but it records the forecast UV at that moment rather than the dose you actually received. Sunwise does not write to Apple Health; it forecasts forwards, showing the minutes of safe exposure you have left rather than logging the past.

Does the Apple Watch Weather app show the UV index?

Yes, but only inside the app. Open Weather on watchOS, scroll down, and you will find a UV Index reading for the day alongside wind, humidity, visibility, and air quality. What watchOS does not provide is a dedicated UV index complication you can place directly on a watch face, so the UV number always costs you a tap and a scroll. A third-party UV app that ships complications is the only way to get UV onto the face itself.

Can I add UV index data to my Apple Watch face?

Yes, using a third-party UV app that provides complications. Install the app on your paired iPhone, then long-press your watch face, tap Edit, select a complication slot, and choose the UV app from the list. Circular and corner slots typically show the UV number alone; the larger rectangular slots on faces like Modular and Infograph can display the UV index together with a burn time. You can also add the app's widget to the Smart Stack instead, which avoids committing a complication slot at all.

Is Time in Daylight on Apple Watch the same as UV tracking?

No. Time in Daylight, available on Apple Watch Series 6 and later, uses the ambient light sensor to log how many minutes you spent in daylight and stores it in the Health app. It measures duration, not intensity — twenty minutes at UV 1 and twenty minutes at UV 10 both record as twenty minutes, despite delivering wildly different UV doses. Time in Daylight is a target to hit for circadian rhythm, sleep, and mood; a UV burn time is a ceiling to stay under for skin safety. They are complementary metrics and neither substitutes for the other.

Do Apple Watch UV complications update automatically?

Yes. watchOS refreshes complications on a system-managed budget, typically several times an hour, and more often just after you have interacted with the app. Because the underlying UV forecast is published hourly by most data sources, that refresh cadence already samples the source data more frequently than it changes. Complication updates slow down in Low Power Mode and when the watch is disconnected from both your iPhone and Wi-Fi, in which case the complication shows the last cached value.

Does a UV complication drain Apple Watch battery?

Not noticeably. watchOS controls the refresh budget rather than letting apps poll freely, so a UV complication is not continuously fetching data or holding a GPS fix. It uses the same location and background-refresh allowance as the parent app, batched by the system alongside other complications on your face. In practice, adding a UV complication has no perceptible effect on Apple Watch battery life.

Do I need my iPhone nearby for the UV complication to work?

Not for a cellular or Wi-Fi-connected Apple Watch — the watchOS app can fetch its own forecast. If your watch has no independent connection and your iPhone is out of range, the complication will display the most recently cached UV reading rather than a live one, and will catch up as soon as connectivity returns. For a run or a hike away from your phone, a cellular watch or a pre-run glance at the forecast covers the gap.

What should an Apple Watch UV complication actually show?

On a surface where every slot competes for space, the useful content is the decision rather than the datum. That means the current UV index for your GPS location, the remaining burn time in minutes for your skin type, and ideally a hint at when UV peaks today. A complication showing only a bare UV number tends to lose its slot within a week, because the wearer still has to interpret it — whereas 'UV 8 · 17 min' requires no interpretation at all.

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.

By Sunwise · Published April 21, 2026 · Updated October 6, 2026

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.Install a UV forecast app like Sunwise on your iPhone. The watchOS companion app installs automatically on your paired Apple Watch.
2.On your Apple Watch, press and hold the current watch face, then tap Edit.
3.Swipe to the complications screen, tap a complication slot, and scroll the list to find the UV forecast app.
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.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. For the equivalent on iPhone — Home Screen, Lock Screen, and StandBy widgets — see the UV index widget for iPhone guide.

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.

Time in Daylight vs a UV burn time

Apple Watch Series 6 and later track Time in Daylight using the ambient light sensor, logging how many minutes you spent outdoors into the Health app. It is a genuinely useful metric — daylight exposure drives circadian rhythm, sleep quality, and mood, and it is protective against myopia in children — and it is the closest thing to built-in sun tracking on Apple Watch.

It measures duration, though, not intensity. Twenty minutes at UV 1 on a February morning and twenty minutes at UV 10 in July both log as twenty minutes, even though the second delivers roughly ten times the UV dose. There is no skin-type input and no upper limit, because the metric is designed as something to get more of.

A UV burn time is the mirror image: a ceiling rather than a target, scaled to your Fitzpatrick skin type. Watching both on the same wrist covers the whole picture — daylight minutes as a floor for your circadian health, burn time as a ceiling for your skin. For the full breakdown of how the different approaches to sun tracking compare, see the sun exposure tracker guide.

FAQ: UV index on Apple Watch

What is the best UV index app with a widget for Apple Watch?: The right choice depends on whether you want a number or an instruction. Apple's built-in Weather app surfaces a daily UV level inside the app but does not offer a dedicated UV index complication, so the reading is always a tap away rather than on the face. Among third-party options, UV Index Now (UVI Mate), UVmeter, UVLens, Sola, and Sunbeam all ship watchOS companions, and newer apps such as UV Watch lead on skin-type tips and sunscreen reminders. Sunwise's difference is what the complication displays: instead of only the current UV index, it pairs the index with a burn time in minutes calculated for your Fitzpatrick skin type, so the glance answers 'how long can I stay out' rather than 'what is the number'.
Does Apple Watch have a UV sensor?: No. No Apple Watch model, including Series 10 and Ultra, has a UV sensor. The ambient light sensor that powers Time in Daylight measures visible brightness, not ultraviolet, which is why it can tell you that you were outside but not how strong the UV was. Every UV reading on Apple Watch — in the Weather app or in a third-party complication — is a forecast for your location from a weather service, not a measurement taken on your wrist. That is also why a UV complication reads the same under a sleeve as on bare skin: it isn't reading the sky.
Can I log the UV index to Apple Health from my Apple Watch?: Not automatically. Apple Health has a UV Exposure data type, but neither Apple Weather nor Time in Daylight writes the UV index into it. The usual workaround is a Shortcuts personal automation that fetches the current weather, reads the UV index, and logs it to Health on a schedule or when you arrive somewhere — it works, but it records the forecast UV at that moment rather than the dose you actually received. Sunwise does not write to Apple Health; it forecasts forwards, showing the minutes of safe exposure you have left rather than logging the past.
Does the Apple Watch Weather app show the UV index?: Yes, but only inside the app. Open Weather on watchOS, scroll down, and you will find a UV Index reading for the day alongside wind, humidity, visibility, and air quality. What watchOS does not provide is a dedicated UV index complication you can place directly on a watch face, so the UV number always costs you a tap and a scroll. A third-party UV app that ships complications is the only way to get UV onto the face itself.
Can I add UV index data to my Apple Watch face?: Yes, using a third-party UV app that provides complications. Install the app on your paired iPhone, then long-press your watch face, tap Edit, select a complication slot, and choose the UV app from the list. Circular and corner slots typically show the UV number alone; the larger rectangular slots on faces like Modular and Infograph can display the UV index together with a burn time. You can also add the app's widget to the Smart Stack instead, which avoids committing a complication slot at all.
Is Time in Daylight on Apple Watch the same as UV tracking?: No. Time in Daylight, available on Apple Watch Series 6 and later, uses the ambient light sensor to log how many minutes you spent in daylight and stores it in the Health app. It measures duration, not intensity — twenty minutes at UV 1 and twenty minutes at UV 10 both record as twenty minutes, despite delivering wildly different UV doses. Time in Daylight is a target to hit for circadian rhythm, sleep, and mood; a UV burn time is a ceiling to stay under for skin safety. They are complementary metrics and neither substitutes for the other.
Do Apple Watch UV complications update automatically?: Yes. watchOS refreshes complications on a system-managed budget, typically several times an hour, and more often just after you have interacted with the app. Because the underlying UV forecast is published hourly by most data sources, that refresh cadence already samples the source data more frequently than it changes. Complication updates slow down in Low Power Mode and when the watch is disconnected from both your iPhone and Wi-Fi, in which case the complication shows the last cached value.
Does a UV complication drain Apple Watch battery?: Not noticeably. watchOS controls the refresh budget rather than letting apps poll freely, so a UV complication is not continuously fetching data or holding a GPS fix. It uses the same location and background-refresh allowance as the parent app, batched by the system alongside other complications on your face. In practice, adding a UV complication has no perceptible effect on Apple Watch battery life.
Do I need my iPhone nearby for the UV complication to work?: Not for a cellular or Wi-Fi-connected Apple Watch — the watchOS app can fetch its own forecast. If your watch has no independent connection and your iPhone is out of range, the complication will display the most recently cached UV reading rather than a live one, and will catch up as soon as connectivity returns. For a run or a hike away from your phone, a cellular watch or a pre-run glance at the forecast covers the gap.
What should an Apple Watch UV complication actually show?: On a surface where every slot competes for space, the useful content is the decision rather than the datum. That means the current UV index for your GPS location, the remaining burn time in minutes for your skin type, and ideally a hint at when UV peaks today. A complication showing only a bare UV number tends to lose its slot within a week, because the wearer still has to interpret it — whereas 'UV 8 · 17 min' requires no interpretation at all.

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.