London weather forecast: Sunny intervals and mild temperatures expected September 15-21

London, September 15, 2026 – Residents of London can expect a day of pleasant weather with sunny intervals and mild temperatures. The day will begin with a gentle start, gradually warming up to a comfortable maximum. While there is a low chance of rain, the overall conditions are favourable for most outdoor activities.The city is set to experience a day marked by sunshine and comfortable warmth, making it an ideal time to be outdoors. The morning will be cool, but temperatures will rise steadily throughout the day, reaching a peak in the afternoon before cooling down again in the evening. Humidity levels are expected to be on the higher side, contributing to the overall feel of the day.London Weather TodayToday, September 15, 2026, London will see a mix of sunny intervals, offering a bright start to the day. The maximum temperature is forecast to reach 23°C, providing a comfortable warmth. Overnight, the temperature will dip to a low of 14°C, ensuring a cool end to the day. The average temperature for the day is expected to be around 18.5°C.Humidity levels will be noticeable, with an average of 85% throughout the day. This higher humidity, combined with the mild temperatures, will contribute to a pleasant, albeit slightly close, atmosphere. There is a very low chance of precipitation, with daily chance of rain indicated as less than 5%. Wind speeds are expected to be moderate, with a maximum of 38.62 kph, which should not significantly impact outdoor plans. The sunrise is scheduled for 06:36 and sunset at 19:15, offering ample daylight hours.Enjoy the Pleasant ConditionsWith sunny intervals and comfortable temperatures, today is an excellent opportunity to enjoy the outdoors in London. Residents can plan for a day without significant weather disruptions. The mild conditions are perfect for a stroll in one of the city's many parks or for any planned outdoor excursions.Given the moderate wind and low chance of rain, carrying an umbrella is likely unnecessary. However, the higher humidity might make some feel warmer than the actual temperature suggests, so staying hydrated is always a good practice. The extended daylight hours, with sunset after 7 PM, allow for evening activities to be enjoyed under pleasant skies.London Weather for Upcoming 7 DaysThe weather in London is set to remain largely consistent over the next seven days, with a prevailing pattern of sunny intervals and mild temperatures. Following today's pleasant conditions, the forecast indicates a continuation of this trend with minor fluctuations.Tomorrow, September 16, the maximum temperature is expected to be 19°C with a low of 14°C, still featuring sunny intervals. On September 17, the maximum temperature will rise slightly to 20°C, with a low of 11°C, and the weather is predicted to be sunny intervals. September 18 is forecast to be a sunny day with a high of 20°C and a low of 16°C. The latter half of the week will see temperatures hovering around the low twenties. September 19 anticipates sunny intervals with a high of 22°C and a low of 15°C. September 20 and 21 are also expected to bring sunny intervals, with maximum temperatures of 22°C and minimums of 14°C and 15°C respectively. No significant precipitation is indicated throughout this period.DateMax Temp (C)Min Temp (C)Avg Temp (C)Condition2026-09-15231418.5Sunny intervals2026-09-16191416.5Sunny intervals2026-09-17201115.5Sunny intervals2026-09-18201618.0Sunny2026-09-19221518.5Sunny intervals2026-09-20221418.0Sunny intervals2026-09-21221518.5Sunny intervalsThe week ahead in London promises a continuation of mild and generally pleasant weather, with sunny spells dominating the outlook.Source: Data referenced in this article is taken from the latest World News and Live updates. Download the TOI app.