Daily UV Tracker - Real-Time UV Index & Forecast

Check today's UV index, burn-time estimates, SPF guidance and 16-day forecasts for 145,000+ destinations worldwide. Live UV data updates hourly from Open-Meteo and OpenUV, with skin-type-personalised burn times so you know exactly how long you can stay outside safely.

Daily UV Tracker covers every country and region - search any city to see today's UV index, tomorrow's forecast, monthly UV averages, and the safest hours to be outside. Free, no signup required.

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Daily UV Tracker

Castro Valley California UV Index Today & 7-Day Forecast

Check today’s peak UV, safe sun time, burn-time calculator and 7-day UV forecast for Castro Valley California.

Live UV:-

Burn time (no SPF):-

Peak:11:00 - 14:00

Safer:Before 10:00 or after 16:00

☀️ Peak UV: 10. Average: 7. Best season: Apr-Oct.

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Today's Hourly UV Forecast in Castro Valley California USA

Castro Valley California UV Index by Month

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