Heat stress rules from 1 December 2026: what Singapore employers of outdoor workers must have in place
From 1 Dec 2026, four more heat stress measures become mandatory for outdoor work in Singapore. What MOM requires at each WBGT level, and a checklist.
By Cova
If your workers spend their day in the open, on a worksite, a shipyard or a delivery route, four more heat stress measures become mandatory on 1 December 2026. They sit on top of requirements that already apply, such as hourly heat checks and rest breaks.
This guide sets out what the Ministry of Manpower (MOM) requires and a checklist for before 1 December. Every rule links to MOM, the Workplace Safety and Health (WSH) Council or the National Environment Agency (NEA).
What changes on 1 December 2026
On 28 August 2026, MOM announced that it would make four existing recommended practices mandatory, giving employers three months to prepare. From 1 December 2026, employers must (MOM: press release, 28 August 2026):
- establish a heat stress training programme for workers exposed to heat
- provide a cool drinking water supply near work areas
- keep cold water, ice packs or water spray on standby for emergency response
- provide suitable clothing that can reduce or protect workers from excessive heat stress
MOM also added a new recommended (not required) practice: shaded rest areas that are well ventilated and well insulated or cooled. The changes add to existing requirements, including Wet Bulb Globe Temperature (WBGT) monitoring, hydration, rest under shade, acclimatisation and emergency response planning.
Who it applies to
MOM's heat stress page is addressed to occupiers and employers: they "must implement the required measures to reduce heat stress risk for outdoor workers". MOM defines outdoor work as "work done primarily in the open without permanent shade". (MOM: heat stress measures for outdoor work)
One duty depends on the sector: construction sites with a contract sum of $5 million or more, shipyards and the process industry must have a WBGT meter on site. Other workplaces can use the WBGT readings in NEA's myENV app. (MOM: FAQs on heat stress measures) For indoor heat, such as welding or cooking, MOM points to the WSH Council's WSH Guidelines on Managing Heat Stress at the Workplace.
What WBGT is, and where to read it
WBGT is a measure of heat stress that takes in air temperature, humidity, wind speed and solar radiation, not just how hot it feels. (MOM: FAQs)
MOM sets its measures in three WBGT bands: below 31°C, 31°C to less than 33°C, and 33°C and above. NEA's public heat stress advisory uses the same bands, labelled Low, Moderate and High heat stress. (NEA and MSS: Manage heat stress when outdoors) Readings are on the MSS heat stress page and in the myENV app. Meters must be calibrated to the manufacturer's specification, or every year if none is given. (MOM: FAQs)
The full set of required measures
These are the measures MOM marks as requirements, in the bands where they apply. "New" marks the four that become mandatory on 1 December 2026. (MOM: heat stress measures for outdoor work; MOM: infographic, effective 1 December 2026)
| Measure | What MOM requires | When |
|---|---|---|
| Acclimatise | Acclimatise workers new to Singapore or back from more than a week's leave, increasing their daily heat exposure gradually over at least 7 days | All bands |
| Monitor WBGT | Check WBGT every hour during work hours, especially in the hotter periods of the day | All bands |
| Drink | Make sure workers rehydrate regularly | Below 31°C |
| Drink | Make sure workers rehydrate at least hourly (MOM recommends 300ml an hour or more, depending on work intensity) | 31°C and above |
| Drink (new) | Provide a cool drinking water supply near work areas | All bands |
| Rest and shade | Make sure workers get adequate rest under shade to recover from heat | Below 32°C |
| Rest and shade | Hourly rest breaks of at least 10 minutes for heavy physical work | 32°C and above |
| Emergency response | Set up an emergency response plan and reporting procedures | All bands |
| Emergency response (new) | Keep cold water, ice packs or water spray on standby | All bands |
| Train (new) | Set up a heat stress training programme for workers exposed to heat | All bands |
| Clothing (new) | Provide suitable clothing that reduces or protects against excessive heat stress | All bands |
MOM also strongly encourages recommended practices, such as moving physical work to cooler parts of the day, a buddy system, closer monitoring of vulnerable workers (for example those above 65, pregnant or back from long leave) and, at 33°C and above, hourly rest breaks of at least 15 minutes for heavy physical work.
What the four new requirements mean in practice
From MOM's FAQs. (MOM: FAQs, requirements from 1 December 2026)
Heat stress training. It can be run in-house, and must at least cover early signs and symptoms, risk factors (worker, task and environment), your workplace's heat stress measures and its emergency procedures. MOM recommends it every year, and before workers are first deployed to hot environments.
Cool drinking water. Water coolers, chilled dispensers or insulated containers all count. Without chilling, store water in shade at least. It should be no more than 3 to 5 minutes' walk from work areas, subject to site constraints.
Cooling supplies on standby. Keep enough cold water, ice packs or water spray to actively cool at least one affected worker for several minutes while you wait for emergency services.
Suitable clothing. Loose-fitting, breathable or moisture-wicking. You can supply it, pay a clothing allowance, or let workers wear suitable clothing they own. Workers who must wear protective clothing for other safety reasons may be exempt.
Rest breaks: three points that catch employers out
From MOM's FAQs:
- The 10 minutes must be continuous. It can't be split into shorter breaks within the hour.
- It must be hourly. Combining two hours into 20 minutes of rest followed by 100 minutes of work isn't allowed.
- It counts as paid working time. If workers already get an unpaid tea break of 10 minutes or more in that hour, you don't need to add another break for that hour.
Enforcement and reporting
Under the WSH Act, employers and occupiers must keep workplaces safe and protect the safety and health of every employee, which MOM says includes minimising the risk of heat injury. Not doing so may lead to enforcement action under the Act, including stop work orders and composition fines. (MOM: FAQs) In April 2026, MOM said it had taken enforcement action against 213 non-compliant employers after checks on outdoor work sites. (MOM: steps taken to mitigate exposure risks for outdoor workers)
Occupational diseases caused by excessive heat must be reported to MOM under the WSH (Incident Reporting) Regulations, through WSH Incident Reporting. If a worker is drowsy or unconscious, MOM says to call 995.
Construction training records in Singapore: courses, certificates and approvals for SMEsWhich safety courses construction workers need, why records matter in an inspection, and how to run training without spreadsheets.cova.sg/resources/sg-construction-training-recordsWhat to do before 1 December: a checklist
The WSH Council publishes a Heat Stress Management Compliance Checklist you can use alongside this one.
- Work out who's in scope. List every role and site with outdoor work, and whether any site needs its own WBGT meter.
- Write your heat stress plan down. MOM requires the measures, an emergency response plan and reporting procedures. A short written plan per site (who checks WBGT, what happens at each band, who calls 995) is the simplest way to show you have them.
- Plan acclimatisation. For every new joiner and every worker back from more than a week's leave, set a schedule that increases heat exposure over at least 7 days, and tell their supervisor.
- Run the training, and keep the records. Cover MOM's four topics in your crews' languages. Record who attended and when, supervisors included, and plan a yearly refresher.
- Check the water, cooling kit and clothing at every site, and decide how you'll provide clothing.
- Log WBGT and rest breaks. MOM doesn't prescribe a log, but an hourly record of the reading and the breaks given is the easiest way to show the rules were followed on a hot day.
- Know how to report. Make sure supervisors know the emergency steps, and that HR knows heat illness must be reported to MOM.
How Cova helps
Cova is HR software for Singapore SMEs. Here's how it supports the people side of the checklist, depending on the modules you choose.
Heat stress training on record. HR can add the company's own courses, such as an in-house heat stress briefing. Managers can book a course for a direct report, and HR can book for anyone. After the class, the worker uploads a PDF, JPG or PNG of the certificate, or HR marks it received if it came in another way.
One list of who's trained. Add the Training master list, and every course booking and certificate sits in one list, with one row per person per course and the class dates. In it, HR sets which certificates each position needs, and the Required but missing tab lists who lacks a mandatory one, with a link to book a course that leads to it.
Sign-offs in one inbox. Training approvals sit in the same Approvals inbox as leave and form requests, and a request waiting more than 3 days turns red. Approvals works on a phone too, so supervisors can decide from site. Forms can have several approval stages, each going to the manager, a role such as HR, or a named person.
A record that can't be edited. Every step of a training request is recorded with who did it, when and why. Entries in the company Audit log can't be edited or deleted, by HR, Admins or anyone else.
Daily heat checks and acclimatisation, set up for you. Want a daily heat-check form for supervisors, with the hourly WBGT reading, the rest breaks given and the water and cooling kit checked? Yes, we build and set this up for your team. HR can already build its own forms in Cova, with short text, multiple choice and file upload questions. Want a 7-day acclimatisation plan for every new joiner and every worker back from more than a week's leave, with reminders to the supervisor? Yes, we build and set this up for your team. Onboarding checklists are live today: each step has an owner and a due date, and Cova reminds the owner on the due date or daily until it's done, for up to 14 days.
The steps removed: no chasing attendance sheets, no approvals lost in chat threads, and no spreadsheet of who's trained.
Ask the Cova team for a quote for your headcount and the modules you need.
Training management for Singapore SMEs: SkillsFuture funding, providers, approvals and recordsSkillsFuture subsidies, SFEC and Absentee Payroll, choosing a provider, and running booking, approvals and certificates.cova.sg/resources/sg-training-management-smes Approval workflows for Singapore SMEs: leave, training and onboarding without WhatsAppWhy chat approvals fail, what a good approval flow needs, and how to apply it to leave, training and onboarding.cova.sg/resources/sg-approval-workflows-smes Choosing an HRIS in Singapore: a buyer's checklist for SMEs and site-based teamsWhat to check before you buy an HR system: leave rules, work passes, training records, approvals, PDPA, mobile access and pricing.cova.sg/resources/sg-hris-buyers-checklistFrequently asked questions
What becomes mandatory on 1 December 2026?
Four measures that were recommended: a heat stress training programme, cool drinking water near work areas, cold water, ice packs or water spray on standby for emergencies, and suitable clothing. They add to existing requirements such as hourly WBGT checks, acclimatisation and rest breaks.
Do I need my own WBGT meter?
Construction sites with a contract sum of $5 million or more, shipyards and the process industry must. Other workplaces can use NEA's myENV app. Either way, check WBGT every hour during work hours.
When must workers get a rest break?
When WBGT reaches 32°C or higher, workers doing heavy physical work must get an hourly rest break of at least 10 continuous minutes, counted as paid working time. At 33°C and above, MOM recommends at least 15 minutes.
Can heat stress training be done in-house?
Yes. It must at least cover early signs and symptoms, risk factors, your workplace's heat stress measures and your emergency procedures.
Can Cova track heat stress training and daily heat checks?
For training, yes: HR can add an in-house heat stress course and book it for anyone, and with the Training master list every booking and certificate sits in one place. For daily heat checks and acclimatisation plans, yes, we build and set this up for your team.
This guide is general information, not legal advice. Requirements were checked against the MOM, WSH Council, NEA and MSS websites on 21 October 2026. Always check the linked pages for the latest position.
Sources
- MOM, MOM enhances heat stress protection for workers amid rising heat risks (28 August 2026)
- MOM, Heat stress measures for outdoor work
- MOM, FAQs on heat stress measures for outdoor work
- MOM, Heat stress measures for outdoor work infographic (effective 1 December 2026)
- MOM, Steps taken to mitigate exposure risks for outdoor workers (7 April 2026)
- MOM, WSH Incident Reporting
- WSH Council, WSH Guidelines on Managing Heat Stress at the Workplace
- WSH Council, Heat Stress Management Compliance Checklist
- NEA and MSS, Manage heat stress when outdoors (January 2026)
- MSS, Heat stress readings