Marks & Spencer reveals exact date you should swap to a warmer duvet this autumn

THE optimum date to switch your summer duvet for your winter one for toasty autumn nights has been revealed by an expert. While it feels like summer hasn’t fully left yet, cooler weather is on the horizon – and that means chilly nights that require cosy bedding. The exact date to ditch your summer duvet has been revealed by experts Credit: Getty M&S has analysed last year’s weather to devise the perfect duvet-changing plan Credit: Getty Most of us are still making the most of our lighter summer duvets and you might feel unsure about when the best time to switch to something thicker is. Luckily, a pro has revealed exactly when to do so, to nail the timing in relation to the temperature, and it might be sooner than you were expecting. Sign up for the Money newsletter Thank you! Bedding experts at M&S have provided some must-know info on ideal duvet tog ratings based on outside temperatures as well key duvet-changing dates to make note of. While the temperature remains at 18 degrees or above, a 4.5 tog or lower will cut it for a comfy sleep. But when the thermometer drops under 15 degrees, 10.5 tog or higher is a must. For temperatures between 15 and 18 degrees, a middle ground of 7.5 to 10.5 works. That being said, the M&S experts have analysed last year’s weather to give us exact dates for our tog requirements. Mark September 20 and November 7 in your calendars. Melissa Goldman, senior buyer at M&S, explained: “September 20 has been revealed as the date when UK households should switch their duvet for autumn. Most read in Money “Last year, temperatures fell below 18°C on this date and didn’t rise above that point again for the rest of the year, marking it as the ideal time for people in the UK to swap their summer duvet for a 7.5 to 10.5 tog duvet.” As for thicker bedtime coverage, Melissa adds: “For winter, the 7th November is the date to change your duvet. Temperatures dropped below 15°C on this date in 2025 and remained there or below until year-end, making this the perfect time to switch to a warmer winter duvet of 10.5 tog or above.” If you’re confused about how the tog system actually works, Melissa has the answers to this, too. She said: “A tog (thermal overall rating) measures the thermal insulation of bedding. The higher the number, the better the duvet will retain heat and keep you warm. “As a general rule of thumb, we recommend changing your duvet in line with outside temperatures to ensure optimal sleep quality,” Melissa continued. “The lightest duvets (anything below a 4.5 tog rating) are best suited to the summer months when temperatures frequently exceed 18°C. Duvets ranging between a 7.5 and 10.5 tog rating are best for transitional seasons like spring and autumn and 10.5 duvets are ideal for winter. “While a 10.5 tog duvet is sufficient for most modern homes with central heating, for those who feel the cold especially at night, a 13.5 tog duvet is a good option for the coldest winter months.” Comment now