A water cooler at the office may offer little protection to employees working at a distant outdoor location. The same applies to emergency cooling supplies that nobody can access quickly. For employers, preparing for Singapore’s enhanced heat stress measures means checking whether protection works throughout the working day.
The MOM heat stress requirements 2026 introduce four mandatory measures from 1 December 2026: heat stress training, cool drinking water near work areas, emergency cooling supplies and suitable clothing. MOM announced the changes on 28 August, giving employers three months to prepare. These measures strengthen the existing framework for outdoor work. Read MOM’s official announcement.
This guide explains the changes, the controls employers should already have, and practical steps to complete before December. The implementation suggestions below help businesses organise preparation; they are not additional statutory requirements.
Four practices previously recommended under the Heat Stress Management Framework become mandatory. Businesses that already follow them should verify consistent implementation across sites, shifts and teams.
MOM also introduces a recommendation for shaded rest areas to be well ventilated and well insulated or cooled. Providing adequate rest under shade is already part of the framework. The newly recommended improvement concerns the conditions within that rest area.
Learn more: Refer to MOM’s updated outdoor work heat stress infographic, which distinguishes requirements from recommendations.
Start by identifying work that exposes employees to outdoor heat. Relevant activities may include construction, landscaping, outdoor cleaning, maintenance and loading operations. These are practical examples, not an exhaustive legal list.
An SME with a small outdoor team should assess its actual activities rather than assume the issue only concerns large construction companies. Look at where employees work, how long exposure lasts, physical effort, protective equipment and access to recovery areas.
Under the Workplace Safety and Health Act, employers must assess risks, implement effective controls, provide sufficient instruction and supervision, and establish emergency arrangements. MOM also explains the responsibilities of principals and occupiers, which matter where several businesses share a worksite. Review MOM’s explanation of stakeholder responsibilities.
For a business using contractors, a useful starting question is: who checks that every arriving team can access the site’s heat protection measures?
Build training around the tasks employees actually perform. Explain when to hydrate and rest, how to raise concerns, where assistance is available and what the site’s emergency procedure requires.
Use languages and formats the workforce understands. A supervisor can ask workers to show the nearest water point or explain who they would contact if a colleague became unwell. This helps identify misunderstandings that an attendance signature may miss.
As practical preparation, keep the training materials, attendance and dates together. Include new starters and workers changing tasks in the training schedule. Supervisors should understand their own role in adjusting work and escalating concerns.
The WSH Council explains that heat stress occurs when the body cannot remove excess heat effectively. Heat-related illnesses can include cramps, heat exhaustion and potentially fatal heat stroke. Learn about heat stress management from the WSH Council.
Review water provision against the location of the work, including temporary or moving work areas. A supply point that served yesterday’s team may be poorly placed after work moves elsewhere.
Assign someone to check water availability and replenishment during the shift. Ask employees whether reaching the supply involves a lengthy walk, restricted access or waiting for permission. These checks are practical ways to test whether the arrangement supports regular hydration.
For mobile teams, plan access before deployment. Consider how drinking water remains cool during transport and how workers obtain more when the initial supply runs out. Include replacement supplies in routine purchasing rather than relying on an employee to notice a shortage.
The new requirement identifies cold water, ice packs or water spray as emergency cooling supplies. Decide where they belong, who checks them and how workers access them immediately.
Run a short drill to test the complete response. Can the team locate the equipment, contact the designated responder and direct emergency services to the work area? A drill can expose problems such as missing keys or unclear location instructions.
WSH Council guidance advises calling 995 immediately for suspected heat stroke and cooling the person while awaiting the ambulance. Its instructions include moving the person to a cooler area, applying cool water and fanning, and using ice packs at the armpits and groin.
Review uniforms and protective clothing against both heat exposure and the hazards of the job. Consider whether the clothing is suitable for the worker’s activity, working environment and required protective equipment.
A change intended to reduce heat should preserve protection against other hazards. Where specialised protective clothing is necessary, involve the person responsible for workplace safety before changing specifications.
For procurement, record the reason for the selected clothing and obtain worker feedback after use. Practical problems with fit or wearability may become apparent only during an actual shift. Include new starters and replacement garments in the supply plan.
The December measures sit alongside WBGT monitoring, hydration, shaded rest, acclimatisation and emergency planning. Employers should review these together because weaknesses in one area can undermine the others.
Wet Bulb Globe Temperature, or WBGT, reflects air temperature, humidity, wind and solar radiation. It differs from the ordinary temperature displayed in a weather forecast. Meteorological Service Singapore publishes WBGT information and explains that its public heat stress advisory is intended for prolonged outdoor activity by the general population. Explore Singapore’s official heat stress information.
MOM’s monitoring guidelines require hourly WBGT monitoring for workplaces with outdoor activities, especially during hotter periods. On-site meters are required for construction sites with contract sums of S$5 million or more, shipyards and the process industry. Other workplaces may use the nearest relevant station’s readings through myENV.
Measurements should represent workers’ exposure. Review the monitoring location when work moves or additional heat sources are introduced. Record readings and make sure the supervisor knows what action follows. Learn more about MOM’s WBGT monitoring guidelines.
MOM’s updated infographic specifies at least 10 minutes of rest each hour for heavy physical work when WBGT reaches 32°C, increasing to at least 15 minutes each hour at 33°C and above. Longer rest periods are recommended as WBGT rises. Adequate shaded rest remains necessary at lower readings too. Check the WBGT bands and associated measures.
Build recovery time into the work plan so supervisors can implement breaks without improvising cover. Review whether the rest area has enough space for the people scheduled to use it.
The framework calls for gradually increasing daily heat exposure over at least seven days for workers new to Singapore or returning from leave exceeding one week. Review MOM’s acclimatisation requirements.
Make the return-to-work date visible to the person assigning tasks. If HR knows an employee has returned from extended leave but the site supervisor does not, the deployment plan may overlook the required adjustment period.
The following schedule is an implementation suggestion. Employers should address existing heat risks immediately and complete the new arrangements before 1 December.
List outdoor activities, locations, exposed workers and contractor interfaces. Compare current arrangements with the updated framework and assign an owner and completion date to each gap.
Visit work areas during operating hours. Ask workers where they drink, rest and seek help. This provides a more useful picture than checking an equipment list from the office.
Arrange training, place supplies, assess clothing and update emergency procedures. Agree who maintains shared facilities and what happens when a team moves to a different location.
Include the recurring costs in the operating budget. Replenishment, maintenance, replacement clothing and training time need funding after the initial purchases are complete.
Observe real shifts and run an emergency drill. Check whether the arrangements work when the usual supervisor is absent or several teams need the same facilities.
Close outstanding gaps and retain dated records of the review. An unresolved issue should have a named owner and an interim control appropriate to the risk, with corrective work completed before the deadline.
Use these questions to support an internal review. They supplement the official framework and do not replace a workplace risk assessment.
For example, a landscaping business might provide drinking water at its depot while its afternoon team works elsewhere. A useful review follows that team’s day: departure, travel, outdoor tasks and recovery breaks. It then identifies where supplies and responsibility need to move with the workers.
Their stated effective date is 1 December 2026. Existing workplace safety duties and framework controls continue during the preparation period. The announcement is not a reason to postpone addressing current risks.
MOM specifies the sectors and construction threshold requiring on-site meters. Remaining workplaces may refer to myENV as described in its monitoring guidance. Confirm the appropriate arrangement for the actual workplace.
Employers retain their applicable WSH duties. External administrative support can help manage routine business work, while the employer and relevant site stakeholders remain responsible for implementing safety arrangements.
Preparing for the December changes requires time for site reviews, training and supervision. Keeping routine workforce administration organised helps managers give those activities the attention they need.
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Learn more about ATHR’s payroll support, or contact ATHR Corporate Services to discuss your company’s needs before the year-end workload builds.
The ATHR Content Team is a group of professional writers from Singapore and the Philippines, committed to delivering informative, practical, and engaging content for business owners across Southeast Asia.
