Does Santa Rosa South need sun protection in winter?

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

Can you burn on a cool day in Santa Rosa South?

Yes. UV is not heat. A cool, windy or lightly cloudy day in Santa Rosa South can still sit at UV 3 or above, especially from spring through autumn. Temperature on this page is for context only; the UV number is what decides protection.

UV index in Santa Rosa South today

Santa Rosa South in California sits inland at 33.5°S, where dry air and fewer clouds often mean harsher UV than the temperature suggests. Summer middays typically reach 10–12 (very high to extreme). This is warm-temperate America: a long protection season from spring through fall, with clear winter days that can still burn.

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

Today and tomorrow in Santa Rosa South

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

When Santa Rosa South needs sun protection

Sun protection is needed in Santa Rosa South typically from April through October, and any other day UV reaches 3. Inland heat or a cool change does not change the UV index; go by the number, not how the day feels.

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

Frequently asked questions

When does Santa Rosa South need sun protection?: Whenever the UV index is 3 or above. In Santa Rosa South that is typically from April through October, and any other day UV reaches 3. The EPA Sun Safety action steps apply at the same threshold used worldwide.
Does Santa Rosa South need sun protection in winter?: Not every day. Midwinter middays in Santa Rosa South often sit below UV 3, but clear late-winter and early-spring days cross the threshold before summer fully arrives. Check the live index.
Can you burn on a cool day in Santa Rosa South?: Yes. UV is not heat. A cool, windy or lightly cloudy day in Santa Rosa South can still sit at UV 3 or above, especially from spring through autumn. Temperature on this page is for context only; the UV number is what decides protection.