The Met Office and UK Health Security Agency have issued a London amber cold weather alert in effect until Tuesday 6 January 2026, as temperatures drop significantly across the capital.
An amber alert indicates increased health risks, particularly for vulnerable populations including elderly residents, young children, people with long-term health conditions, and those on low incomes who may struggle to heat their homes adequately.
Exposure to cold temperatures increases blood pressure and makes blood more likely to clot, raising the risk of heart attacks, strokes, and other serious health complications.
Simple steps to stay safe
Health officials recommend heating rooms you spend most time in to at least 18°C if possible, particularly for those with health conditions. Keep bedroom windows closed at night to maintain warmth, and wear multiple layers of thinner clothing rather than one thick layer.
The NHS urges residents to check on family, friends and neighbours who may be at higher risk of becoming unwell during cold weather. If you are at higher risk yourself, ask others to check on you. Simple welfare checks can make a significant difference in preventing cold-related health problems.
Make sure you have sufficient food and medicine supplies, and take simple measures to reduce draughts at home. Check the weather forecast and news regularly for updates on conditions.
Cold weather makes everyone more vulnerable to winter illnesses including flu, coughs and colds. If you are eligible for flu or COVID-19 vaccinations, the NHS encourages you to get vaccinated. Information on eligibility and booking is available through the NHS winter health guidance.
When to seek help
If you feel unwell, get medical help quickly. You can get advice from a pharmacy for minor illnesses, speak to your GP online or by phone, or contact NHS 111 at 111.nhs.uk or by calling 111 if you have an urgent medical problem and are not sure what to do.
In an emergency, go to A&E immediately or call 999.
The Weather-Health Alerting System provides early warnings when temperatures are likely to impact health and wellbeing. Yesterday’s yellow alert was upgraded to the London amber cold weather alert as forecasts showed more severe cold conditions developing through the new year period.
