UV index in San Jose
Current UV index, temperature and forecast for San Jose, United States — continuously updated from open weather data.
Low
Low UV — enjoy the sun.
15°C· Updated 11:29 AM
Forecast
UV in San Jose through the year
At 37°N, the midday sun in San Jose pushes the clear-sky UV index to around 11 (Extreme) at its June–July peak. With mostly clear skies, the real midday peak holds near 11 (Extreme). By midwinter the low sun drops UV to near zero, so sun protection is mainly a spring-to-autumn concern.
The UV scale
- 0–2LowLow UV — enjoy the sun.
- 3–5ModerateUse sunscreen if you're outside for long.
- 6–7HighSPF 30+ recommended.
- 8–10Very highSPF 50+, seek shade 11–15.
- 11+ExtremeAvoid direct sun. Cover your skin.
What does the UV index mean?
The UV index is an international measure of the strength of the sun's ultraviolet radiation. The higher the value, the faster unprotected skin is damaged. From UV 3 upwards, sun protection is recommended. The level in San Jose varies with the season, the time of day and cloud cover — it peaks around midday in summer.
Frequently asked questions
What is the UV index in San Jose right now?
Right now the UV index in San Jose is 0 (Low). Low UV — enjoy the sun.
When is the sun strongest in San Jose?
UV is strongest around solar noon (roughly 11:00–15:00) in June–July, when the index in San Jose peaks near 11 (Extreme). Use sun protection during those hours through the high season.
What sun protection do I need?
At UV 1–2, protection is normally not needed. At UV 3–5, sunscreen is recommended. At UV 6–7: SPF 30+, a hat and sunglasses. At UV 8 or higher: SPF 50+, seek shade between 11:00 and 15:00, and cover up.
How often is the UV forecast updated?
Values are fetched continuously from Open-Meteo's open weather data and cached for a few minutes, so the page always shows a current level.
