Does San Tomas need sun protection in winter?

Not every day. Midwinter middays in San Tomas 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 San Tomas?

Yes. UV is not heat. A cool, windy or lightly cloudy day in San Tomas 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 San Tomas today

San Tomas is an inland California suburb at 37.3°S. Typical summer peaks of 9–11 (very high to extreme) arrive whether the day feels scorching or merely mild. 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 San Tomas

Peak UV, temperature and conditions for San Tomas. 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 San Tomas can still sit at protection levels. Why you burn on cloudy days.

When San Tomas needs sun protection

Sun protection is needed in San Tomas typically from May through September, and any clear spring or fall 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 San Tomas need sun protection?: Whenever the UV index is 3 or above. In San Tomas 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 San Tomas need sun protection in winter?: Not every day. Midwinter middays in San Tomas 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 San Tomas?: Yes. UV is not heat. A cool, windy or lightly cloudy day in San Tomas 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.