For generations, workplace safety campaigns centred on machinery, chemicals, noise and manual handling. Today, another issue is moving rapidly up the union agenda: extreme weather.
Whether it is bus drivers trapped in overheating cabs, postal workers walking miles in soaring temperatures, or probation staff traveling through floods and storms unions across Britain are increasingly treating severe weather as a workplace safety issue rather than an unavoidable inconvenience.
That shift matters because workers are often the first to experience the consequences of extreme conditions. Long before government agencies issue guidance or employers update policies, drivers, delivery workers, construction workers, teachers, cleaners, caterers and transport staff are dealing with the reality on the ground.
From collective bargaining to industrial action, unions are forcing employers to recognise a simple principle: workers should not have to risk their health simply to do their jobs.
The London Bus Drivers Who Refused to “Sweat It Out”
One of the clearest examples of workers taking collective action over weather-related conditions came in 2026 when around 1,500 Unite members employed by Arriva North London took strike action over excessive temperatures inside bus cabs. Many vehicles were fitted only with air-cooling systems rather than proper air conditioning.
According to Unite, drivers reported cab temperatures reaching 40°C or higher during periods of exceptionally hot weather. The union argued that the conditions increased the risk of fatigue, dehydration, heat exhaustion and heat stroke.
The dispute demonstrated how workplace safety concerns can become industrial relations issues when employers fail to act quickly enough.
After industrial action and negotiations, drivers secured what Unite described as a “groundbreaking” agreement. Arriva committed to fitting air conditioning to buses by May 2027 and accepted a new rule that buses with defective heating or cooling systems would be withdrawn from service after 35 minutes rather than leaving drivers exposed for extended periods.
Unite national lead officer Onay Kasab summed up the significance of the victory:
“This is an excellent win for our members, who stood together on picket lines to fight for and win an agreement that means that drivers are not simply expected to sweat it out.”
The dispute set an important precedent. It showed that workers could move beyond simply reporting unsafe conditions and instead win enforceable protections through collective action. It also shows how union action can benefit the wider community by improving conditions in areas used by all.
From Heatwaves to Snowstorms: The Napo Warning
The concerns extend far beyond transport.
The probation union Napo has argued that severe weather should become a permanent item on health and safety agendas throughout the Probation Service. Members routinely work through heatwaves, flooding, storms, poor air quality, snow and ice while conducting home visits and community appointments.
Napo’s position is notable because it places weather-related risks alongside more traditional occupational health concerns. The union argues that weather conditions can affect not only workers but also vulnerable people under probation supervision.
The union has called for clear national guidance covering issues such as:
- Dynamic risk assessments during weather alerts.
- Safe travel arrangements.
- Postponement of journeys where necessary.
- Home working and remote appointments.
- Additional protections for vulnerable staff.
- Emergency contingency plans.
As Napo put it, “extreme weather” is not simply an environmental concern but “a workplace, health and safety issue.”
Postal Workers Push for Stronger Heat Protections
Communication Workers Union (CWU) members provide another example of how unions are driving workplace change.
Postal workers spend long hours outdoors and are particularly vulnerable during periods of high temperatures. Following severe heat episodes, the CWU negotiated enhanced guidance with Royal Mail covering heat-related risks. The guidance requires formal assessments, consultation with union safety representatives, support for vulnerable workers and adjustments to duties during weather alerts.
The union has consistently argued that heat exposure should be treated like any other workplace hazard.
That approach has increasingly gained traction throughout the labour movement. Rather than accepting weather conditions as unavoidable, unions have argued that employers must identify risks, assess them and take practical steps to reduce them.
The Growing Campaign for Temperature Standards
A wider campaign has also emerged around the absence of legally defined maximum workplace temperatures.
Trade unions have long criticised the fact that UK law requires workplaces to be kept at a “reasonable” temperature but does not establish a clear upper limit.
The Trades Union Congress has responded by organising workplace inspections, producing model agreements and encouraging union health and safety representatives to challenge unsafe conditions. During its workplace heat campaign, more than 1,000 union health and safety representatives participated in inspections aimed at identifying excessive temperature risks.
The movement’s argument is straightforward. Workers in offices, warehouses, kitchens, buses, rail depots, factories and construction sites should have access to clear protections rather than vague assurances.
Industrial Action Over Safety Is Nothing New
The recent focus on weather-related risks fits into a much longer trade union tradition.
Workers have repeatedly used industrial action to address safety concerns when employers failed to respond adequately.
A Return to Core Trade Union Values
There is a tendency to view extreme weather solely through the lens of public policy or environmental debate. Trade unionists tend to see it differently.
The real question is practical.
Can a bus driver work safely inside an overheated cab?
Can a postal worker complete a delivery round during a heat alert without adequate protection?
Can a probation officer travel safely during flooding or severe storms?
Can employers demonstrate they have assessed the risks and taken reasonable steps to reduce them?
Across Britain, unions are increasingly insisting that the answer to those questions must be yes.
The victories won by London bus drivers, the campaigns mounted by postal workers, and the demands from probation staff all point in the same direction. Workers are no longer prepared to accept that severe weather is simply something they must endure.
Instead, they are using the most powerful tools available to them, organisation, collective bargaining and, when necessary, industrial action, to ensure that workplace safety keeps pace with the realities of modern working life.
Because when temperatures soar, storms hit or conditions become dangerous, health and safety cannot be treated as an afterthought. It has to be the first priority.
By Maria Camara