UV Index Today in San Jose, California
Hourly UV Index Chart
Safe Exposure Time
Estimated based on the Fitzpatrick scale for skin color and a UV Index of
*Estimate assumes proper application of broad spectrum sunscreen with reapplication every 2 hours.
Important Safety Information
General Guidelines
These exposure times are estimates based on scientific research and should be used as general guidelines only. Individual responses to UV exposure may vary.
Affecting Factors
UV exposure is affected by: time of day, season, altitude, cloud cover, reflection from surfaces, and individual skin sensitivity.
Protection Tips
For proper sun protection: seek shade during peak UV hours (10 AM - 4 PM), wear protective clothing, use broad-spectrum sunscreen, and monitor the UV index regularly.
Medical Advice
Consult with a healthcare provider for personalized sun protection advice, especially if you have a history of skin conditions or are taking medications that may increase sun sensitivity.
SUNSET & SUNRISE
San Jose's UV Climate
San Jose, located in the heart of Silicon Valley, experiences a Mediterranean climate with high UV exposure for much of the year. The city's inland location and frequent clear skies result in strong UV radiation, especially during the long summer season. Sun protection is essential for outdoor activities, particularly during midday hours.
Average Annual UV Index
7.1
Peak UV Season
April - October
Sunny Days per Year
257
Practical Tips for Outdoor Activities
Make the most of outdoor activities while staying safe in Santa Clara County:
- Check UV index and weather radar before planning outdoor activities
- Schedule outdoor activities during low UV hours
- Use appropriate sun protection based on UV levels
- Stay hydrated during outdoor activities
- Take regular breaks in shaded areas
- Monitor weather conditions for changes
- Be prepared for sudden weather changes
- Know the signs of heat-related illness
- Wear a hat and protective clothing
- Check visibility conditions before outdoor plans
- Stay alert to weather alerts and warnings
UV and Weather in Santa Clara County
Learn about Santa Clara County's unique climate patterns, UV radiation levels, and how they affect your daily life. Enter your zip code for location-specific weather radar data and UV forecasts to help you make informed decisions about outdoor activities and sun protection.
Climate and UV Patterns
San Jose's climate features mild, wet winters and hot, dry summers. UV index values are highest from late spring through early fall, with peak values reaching 9-10 on clear days. The inland location means less marine influence, resulting in higher UV exposure than coastal cities.
UV Index and Health Impact
Understanding UV radiation levels is crucial for protecting your health. The UV index in Santa Clara County varies throughout the year:
- Summer (April-September): High to Very High UV (7-10+)
- Spring/Fall: Moderate to High UV (5-7)
- Winter: Moderate UV (4-6)
- Peak UV hours: 10 AM - 4 PM
- Cloudy conditions: UV reduced by 20-40%
- Clear skies: Maximum UV exposure
- Visibility conditions affect UV intensity
Local Weather Patterns
San Jose's weather is characterized by long, hot summers with abundant sunshine. UV exposure is highest from April through October, with midday hours presenting the greatest risk. Residents and visitors should use sun protection year-round, especially during outdoor recreation and tech events.