Dangerous Heat Will Cause Illness or Injury Monday in Va., Md., D.C.

Forecasters are warning residents to avoid spending time outdoors on Monday.

A heat advisory will be in effect from noon until 8 p.m. Monday, according to the National Weather Service.

The heat index, or "feels like" temperature, is expected to climb to near 109 degrees, with actual temperatures in the mid-90s to around 100 degrees.

This will mean the potential for heat-related illness for those without air conditioning or those outdoors for an extended period, according to the weather service.

More at Patch:

• Heat Wave Timeline: Maryland | Washington, D.C. | Virginia

"Take extra precautions if you work or spend time outside," according to a weather service statement. "When possible, reschedule strenuous activities for early in the morning or in the evening."

Other tips include:

• Know the signs of heat exhaustion and heat stroke,
• Wear lightweight and loose fitting clothing when possible, and
• Drink plenty of water.

When working outside, schedule frequent rest breaks in a shaded or air conditioned area. Anyone overcrome by heat should be moved to a cool, shaded location.