Union City, California

High

6.3

UV Index · Now

Cover up.

Wear long sleeves, SPF 30+, and seek shade midday.

Unprotected

31 min

until skin starts to burn.

With SPF 30

15 hr 45 min

Average unprotected skin. Lighter skin burns faster, darker skin slower.

HeatComfortable

Air

21°

Feels like

21°

Humidity

42%

Questions about Union City today

What is the UV index in Union City right now?
The UV index in Union City, California is 6.3 — categorised as High. Wear long sleeves, SPF 30+, and seek shade midday.
Is it safe to go outside in Union City today?
Caution — UV is high (6.3) in Union City. Wear long sleeves, SPF 30+, and seek shade midday. The peak risk window is roughly 11 am to 4 pm.
How long does it take to get sunburn in Union City?
Average unprotected skin starts to burn in roughly 31 min at the current UV index of 6.3 in Union City. SPF 30 multiplies that window by about 30×. Lighter skin burns faster; darker skin burns more slowly.
What does the heat feel like in Union City today?
Air temperature is 21°C with 42% humidity, giving a "feels like" reading of 21°C — comfortable.
When is the safest time to step outside in Union City?
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 Union City, especially through summer.
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Data: Open-Meteo · Cities: GeoNames (CC-BY 4.0) · Updated Tue 8:30 AM · Refreshes every 30 minutes