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Palo Alto UV Index Today

Day Summary

The UV index in Palo Alto, United States Flag of United States will reach a high of 7.7 today. This means a high level of sun exposure. See our tips below to stay safe!

Last checked: 2025-09-08

Hourly Forecast Chart

Today's Safety Tips

Be careful! The sun's rays are strong. Try to stay in the shade between 10 a.m. and 4 p.m. Wear a hat, sunglasses, and reapply SPF 30+ sunscreen every 2 hours.

Palo Alto's UV Index

Palo Alto's UV index is usually moderate, ranging from 3 to 7 depending on the season. It reaches higher levels in summer, often between 8 and 10 during peak midday hours. UV exposure is lower in winter months.

Weather Seasons

UV index

Palo Alto has warm, dry summers with temperatures around 75-85°F and mild, wet winters with temperatures between 45-60°F. Most rain falls from November to March, while summer months are mostly sunny and dry, typical of a Mediterranean climate.

Palo Alto's Climate

Compared to the wider California Bay Area, Palo Alto is slightly warmer and drier, especially in summer. Compared to neighboring states like Oregon or Nevada, it has milder winters and less snowfall, with less humidity than coastal areas to the west.

Hourly UV Index Trend

See the UV index hour by hour for Palo Alto. When the level is high, it's smart to find some shade.

Disclaimer

* The information on this page about the UV index in Palo Alto is for educational purposes only. It is not a substitute for professional medical advice. Always consult a doctor for any health concerns.