San Marcos, California
Moderate3.9
UV Index · Now
Hat & SPF.
A hat and SPF 30 are enough for most people.
Unprotected
51 min
until skin starts to burn.
With SPF 30
25 hr 38 min
Average unprotected skin. Lighter skin burns faster, darker skin slower.
HeatComfortable
Air
19°
Feels like
19°
Humidity
52%
Questions about San Marcos today
- What is the UV index in San Marcos right now?
- The UV index in San Marcos, California is 3.9 — categorised as Moderate. A hat and SPF 30 are enough for most people.
- Is it safe to go outside in San Marcos today?
- Yes — UV is moderate (3.9) in San Marcos right now. A hat and SPF 30 are enough for most people.
- How long does it take to get sunburn in San Marcos?
- Average unprotected skin starts to burn in roughly 51 min at the current UV index of 3.9 in San Marcos. SPF 30 multiplies that window by about 30×. Lighter skin burns faster; darker skin burns more slowly.
- What does the heat feel like in San Marcos today?
- Air temperature is 19°C with 52% humidity, giving a "feels like" reading of 19°C — comfortable.
- When is the safest time to step outside in San Marcos?
- UV is highest between 11 am and 4 pm. Early mornings (before 9 am) and late afternoons (after 5 pm) are the safest windows for unprotected skin in San Marcos, especially through summer.
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Data: Open-Meteo · Cities: GeoNames (CC-BY 4.0) · Updated Tue 10:00 AM · Refreshes every 30 minutes