Does South Lake Union need sun protection in winter?

Not every day. Midwinter middays in South Lake Union often sit below UV 3, but clear late-winter and early-spring days cross the threshold before summer fully arrives. Check the live index.

Does the water make UV worse in South Lake Union?

It can. The lake surface 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 South Lake Union today

Lakeside South Lake Union (WA) is 47.6° south. Time on the water or the foreshore adds reflection on top of a January sky that commonly reaches 8–10 (very high). This is cool-temperate America: summer UV still climbs into the very high band, and spring arrives before the weather feels hot.

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

Today and tomorrow in South Lake Union

Peak UV, temperature and conditions for South Lake Union. 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 lakeside day in South Lake Union can still sit at protection levels. Why you burn on cloudy days.

When South Lake Union needs sun protection

Sun protection is needed in South Lake Union typically from May through September, and any clear spring or fall day UV reaches 3. Lake glare adds a second dose on top of the sky reading, the same way a beach does.

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 Washington

Cancer Council WA: West Australian sun-safety campaigns and SunSmart schools.

Frequently asked questions

When does South Lake Union need sun protection?: Whenever the UV index is 3 or above. In South Lake Union that is typically from May through September, and any clear spring or fall day UV reaches 3. The EPA Sun Safety action steps apply at the same threshold used worldwide.
Does South Lake Union need sun protection in winter?: Not every day. Midwinter middays in South Lake Union often sit below UV 3, but clear late-winter and early-spring days cross the threshold before summer fully arrives. Check the live index.
Does the water make UV worse in South Lake Union?: It can. The lake surface 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.