Hot Weather

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CPWR - The Center for Construction Research and Training

Summary Statement

This toolbox talk was created by NIOSH and CPWR and covers the potential hazards of working in hot weather. The design allows workers to view a graphic while the facilitator presents the information. After the talk, the sheet can be posted on the jobsite with the graphic side out to reinforce the key points.

CPWR Toolbox Talk logoCertain safety problems are common in a hot environment. Heat on the job can cause dizziness, discomfort and the fogging of safety glasses, all of which can lead to accidents.


Here is an Example

John, a bricklayer, had been outside for 7 straight hours in extremely hot weather. He began to experience nausea and grew very tired. Once his supervisor noticed John was working much slower than usual, he ordered him to take a break, which included resting in shade and drinking water.

Recognizing Heat Illness

Symptoms of heat exhaustion include headaches, dizziness, lightheadedness, fainting, weakness, moist skin, mood changes such as irritability or confusion, upset stomach and vomiting. Heat stroke is an immediate threat to life. Rapid cooling with ice packs or cold water must begin at once. A victim may sweat a lot, but some may have hot, dry skin and no sweating. Either way, it’s an extreme emergency. Call 911 immediately.

Employers should provide shade, rest breaks, and water. What can you do to help avoid exhaustion from heat?

Preventing Injuries from Hot Weather

  • Get enough sleep.
  • Wear light clothing, and include a shirt that serves as a shield from the sun’s rays.
  • Whenever outside, wear a loose-fitting long-sleeved shirt and long pants. Hard hats will protect the scalp.
  • Avoid alcohol; it is particularly dangerous while working in a hot setting.
  • Drink water moderately (about eight ounces every 15 minutes).
  • Plan the day to tackle more strenuous jobs during the cooler morning hours.
  • Rest in shaded areas.
  • Watch new employees for signs of heat illness because it takes about one week for the body to adjust to the heat.

What Are We Going to Do Today?

What will we do here at the worksite today to prevent being injured in hot weather?










OSHA STANDARD: General Duty Clause Section 5(a)(1)

Graphic of a worker resting in the shade and drinking water.

  • Drink water every 15 minutes. Don't wait until you feel thirsty.
  • Rest in shade or air-conditioning
  • Know the signs of heat stroke; it is a medical emergency.