Employers must protect workers from extreme heat, cold, and severe weather. Water. Rest. Shade. Shelter. These are not perks — they are legal requirements. If your employer is ignoring them, here is what to do.
Heat stroke kills. If a coworker collapses or is confused in the heat — call emergency services first. This is a medical emergency before it is a legal one.
☀️ Who This Affects
Extreme heat and weather rights are most urgent for workers in: construction, agriculture, landscaping, warehousing and logistics, food delivery, roofing, roadwork, oil and gas, and any outdoor or non-air-conditioned indoor setting. With climate change intensifying summer temperatures globally, heat-related illness is now one of the fastest-growing categories of workplace injury.
🚫 Heat Illness: Recognizing the Warning Signs
Know these symptoms — in yourself and your coworkers. They are also your evidence that your employer's conditions caused harm.
⚠ Heat crampsPainful muscle cramps, usually in legs or abdomen. First sign of heat stress. Move to shade, drink water, rest.
🛑 Heat stroke — EMERGENCYHigh body temp (103°F/39.4°C+), hot/red/dry skin, rapid strong pulse, possible unconsciousness. Call emergency services immediately. This is life-threatening.
⚠ Cold stress / hypothermiaShivering, fatigue, loss of coordination, slurred speech. In severe cases: no shivering, stiff muscles, loss of consciousness. Move to warm area, remove wet clothing, call emergency services for severe cases.
☀️ Your Legal Rights — Heat and Weather
✅ WaterYour employer must provide free, cool drinking water accessible at all times during work in heat. "Buy it from the vending machine" is not compliance.
✅ Rest breaksRegular rest breaks in a shaded or cool area must be provided during heat work. The frequency and duration are regulated and increase with temperature and workload.
✅ Shade and shelterShade must be accessible whenever the temperature reaches regulated thresholds. In many jurisdictions, outdoor workers must be able to access shade within a short distance of their work area.
✅ AcclimatizationNew workers and returning workers must be gradually exposed to heat — not thrown into full-intensity heat work on day one. Employers must have an acclimatization plan.
✅ Heat illness prevention planIn many US states (California, Oregon, Washington, Colorado) and under federal OSHA guidance, employers must have a written heat illness prevention plan when outdoor work exceeds temperature thresholds.
✅ Right to refuse extreme conditionsIf heat or weather conditions create an imminent danger to your life or health, you have the right to refuse that work under the right-to-refuse provisions of every jurisdiction covered here.
🌎 Standards by Country
🇺🇸
United States
Federal OSHA: No single specific heat standard — enforced under the General Duty Clause (Section 5(a)(1)) which requires employers to provide a workplace free from recognized hazards, including heat. OSHA has been developing a formal heat standard (proposed 2024).
State standards: California (Title 8 Section 3395), Oregon, Washington, Colorado, and Minnesota have specific outdoor heat illness prevention standards requiring water, shade, rest, and acclimatization at defined temperature thresholds (typically 80°F/27°C outdoor, 95°F/35°C indoor).
Indoor workers: OSHA's indoor heat standard (proposed) would cover warehouses, manufacturing, kitchens — employers would need cooling stations, water, and rest breaks above 80°F wet bulb temperature.
Quebec — CNESST: Employers must identify and control heat stress risks as part of their LSST obligations. CNESST provides heat risk assessment tools. Workers can refuse work in extreme heat if it poses an imminent danger. CNESST inspectors can order immediate corrective action including work stoppage.
BC — WorkSafeBC: Occupational Health and Safety Regulation Part 7.27–7.28 covers thermal work environments. In 2021 following the BC heat dome disaster, WorkSafeBC issued an emergency heat regulation requiring access to cool areas, water, and rest for outdoor workers above 35°C.
Ontario: Ontario's Occupational Health and Safety Act requires employers to maintain a safe workplace free from extreme temperature hazards. Guidelines recommend work-rest schedules based on temperature and workload.
Law: The Workplace (Health, Safety and Welfare) Regulations 1992 require employers to maintain a "reasonable" temperature. The Management of Health and Safety at Work Regulations require risk assessment including thermal environment. There is no legal maximum temperature for workplaces — but employers must take action when heat creates a risk.
Minimum temperature: 16°C (13°C for physically demanding work) is the legal minimum for indoor work. Outdoor workers must be protected from cold stress.
Heat: The TUC recommends a maximum of 30°C (27°C for strenuous work) above which work should be stopped. This is not legally mandated but underpins what is "reasonable."
What to do: Contact HSE — 0300 003 1647. Your safety rep or union can raise a formal concern.
🇫🇷
France
Canicule (heatwave) plan: The French government activates a national heatwave plan when temperatures exceed defined thresholds. Employers must implement a heatwave action plan (plan canicule) including hydration, rest areas, and work schedule adjustments.
DUERP: The Document Unique d'Évaluation des Risques Professionnels must include thermal risk assessment. Failure to include it is an employer violation.
Droit de retrait: Workers can withdraw from extreme heat situations that present serious and imminent danger without penalty.
Contact: Inspection du travail — 3646.
🇲🇽
Mexico
NOM-015-STPS-2001: Regulates thermal conditions in the workplace, sets maximum WBGT (wet bulb globe temperature) limits by workload category, and requires water provision, rest areas, and acclimatization schedules.
Agricultural workers: Particularly vulnerable. STPS inspections of agricultural operations are required to verify heat protection measures including water, shade, and breaks.
IMSS reporting: Heat stroke or heat illness at work is a reportable occupational injury. Employers must report to IMSS within 24 hours — 800-623-2323.
Contact: STPS / PROFEDET — 800-911-7877.
✅ What to Do If Your Employer Ignores Heat Safety
1Document the conditions — specifically
Note the temperature (use a thermometer or weather app screenshot), the time, the absence of water, shade, or breaks, and how long conditions have persisted. Photos and videos are excellent evidence. Record any symptoms you or coworkers experienced.
2Report to your supervisor in writing
Send a written message — text or email — identifying the specific conditions and requesting corrective action. State clearly that you consider the conditions a health and safety risk. This creates the employer's documented notice.
3Exercise the right to refuse if conditions are dangerous
If temperatures create an imminent danger (heat stroke risk, hypothermia risk), you can refuse the work under the right to refuse provisions. State specifically that you are refusing due to dangerous thermal conditions. Remain at work performing safe tasks if possible.
"My employer says 'if you can't take the heat, find another job.' Is that a legal response?"
No. Employers have a positive legal duty to protect workers from recognized hazards — including heat. That duty cannot be contracted away or waived by attitude. Document the statement exactly (words, date, who said it) and include it in your complaint to the safety agency. An employer who explicitly dismisses a heat safety concern is demonstrating deliberate indifference to a known hazard, which significantly increases their liability.
"I suffered heat exhaustion at work. Does my employer owe me anything?"
Yes — potentially significant amounts. A heat illness sustained at work is a reportable occupational injury that triggers: workers' compensation coverage for medical costs and lost wages; a potential personal injury claim against the employer if they knowingly failed to provide required protections; and a safety violation complaint that can result in fines against the employer. Seek medical attention immediately, document that it occurred at work, and keep all medical records. See our dedicated guide: Workplace Accident: What to Do First.
"My employer provides water but not shade or breaks. Is that enough?"
No — under most heat safety standards, water alone is not sufficient. Rest breaks in a cool or shaded area are also required once temperatures reach regulated thresholds, along with an acclimatization plan for new workers and a written heat illness prevention plan in many jurisdictions. Document what is provided and what is missing, and file a complaint identifying the specific missing elements.
Retaliation for Heat Complaints — Same Short Deadlines
🇺🇸 USA30 Days
OSHA retaliation complaint.
🇨🇦 Canada30–90 Days
Provincial board — varies.
🇬🇧 UK3 Months −1 Day
Employment Tribunal.
🇫🇷 France5 Years
Prud'hommes civil claim.
🇲🇽 Mexico2 Months
STPS / Labour Tribunal.
*Always confirm exact deadlines with legal aid immediately.
Log Heat Conditions Before You Report
Use the WORKWARS App to document temperatures, symptoms, absence of breaks, and employer responses — building the evidence file that drives a safety inspection.
