Does Duncan need sun protection in winter?

Not every day. Midwinter middays in Duncan often sit below UV 3, but clear late-winter days (from August in much of South Australia) cross the threshold before the weather feels like spring. Check the live index.

Does the water make UV worse in Duncan?

It can. Sand and water reflect ultraviolet, so skin that is not covered — including under the chin and on the tops of feet — picks up extra dose on top of the direct sun. The live UV index on this page is the sky reading; reflection is on top of that.

UV index in Duncan today

Island Duncan (SA) sits at 35.7°S. Open water lifts the UV dose on top of a sky reading that commonly hits 9–12 (very high to extreme) in January. This is warm-temperate Australia: a long protection season from early spring through autumn, with the odd clear winter midday that still burns.

Live reading · data by Open-Meteo · reference monitoring by ARPANSA

Today and tomorrow in Duncan

Peak UV, temperature and conditions for Duncan. Tomorrow’s peak is the number to plan around if you’re heading out in the middle of the day.

Weather conditions right now

Cloud and rain cut heat more than they cut UV. A partly cloudy island day in Duncan can still sit at protection levels. Why you burn on cloudy days.

When Duncan needs sun protection

Sun protection is needed in Duncan typically from September through April, and any other day UV reaches 3. With water on more than one side, reflection is the default, not a beach-only problem.

The threshold, per SunSmart and ARPANSA: whenever UV reaches 3 or above, Slip on covering clothing, Slop on SPF 50+ sunscreen, Slap on a hat, Seek shade and Slide on sunglasses. Read the full sun safety guide.

The UV scale at a glance

0–2Low
3–5Moderate
6–7High
8–10Very high
11+Extreme

Local support in South Australia

Cancer Council SA: South Australian prevention programs and support services.

Frequently asked questions

When does Duncan need sun protection?: Whenever the UV index is 3 or above. In Duncan that is typically from September through April, and any other day UV reaches 3. SunSmart and ARPANSA use the same rule Australia-wide.
Does Duncan need sun protection in winter?: Not every day. Midwinter middays in Duncan often sit below UV 3, but clear late-winter days (from August in much of South Australia) cross the threshold before the weather feels like spring. Check the live index.
Does the water make UV worse in Duncan?: It can. Sand and water reflect ultraviolet, so skin that is not covered — including under the chin and on the tops of feet — picks up extra dose on top of the direct sun. The live UV index on this page is the sky reading; reflection is on top of that.