Burn Warning: More High Temps, UV Index

Today it will be even hotter and the Ultra Violet Index even higher than yesterday in San Marino and the Los Angeles area. Temperatures are expected to top out at 90 degrees, and the UV index will be 10, according to the National Weather Service.

If you sunburn easily, it may be a good idea to put on some sunscreen or wear protective clothing before heading outside today to enjoy a stroll along Mission Street or an ice cream from . A UV index of 10 means that a fair-skinned person could develop a burn in under four minutes if not protected.

Temps and the UV Index are expected to peak at noon today, when the sun is at its highest.

The UV Index is measured on a scale of one to 11+, and 10 is extremely high.

Relief is in sight, however. Temps are expected to drop Thursday and Friday, with highs in the low 80s and upper 70s.

Here's a look at what the UV Index scale looks like:

• A reading of 0-2 indicates a minimal exposure level, and very fair-skinned people could become sunburned in 30 minutes if not properly protected.
• A reading of 3-4 is considered a low exposure level, reducing the danger
  range for those with fair complexions to 15-20 minutes if not protected.
• A moderate exposure level of 5-6 indicates that a person with a fair
  complexion could be safe from sun burn for 10-12 minutes, unless protected.
• A high exposure level reading of 7-9 means that a person could be sunburned in 7-8 minutes.
• A very high exposure level reading of 10, or greater, means a fair-skinned person could suffer a sunburn in about four minutes if not protected.

Yesterday, the UV Index was 9.

For more info on the UV Index scale, check out the Environmental Protection Agency's Sunwise program.