Weekend weather forecast for London - 18 Sep to 20 Sep
By Mr.Data 18th Sep 2026
Weekend Weather Forecast Overview for London
This weekend in London is set to experience varied weather conditions, ranging from partly cloudy skies to anticipated rain showers. Residents and visitors can expect mild temperatures throughout the weekend, with a mix of sun and clouds, and occasional rain, particularly on Saturday and Sunday. It would be wise to keep an umbrella handy and be prepared for some gusty winds, especially on Saturday.
Friday
The day will start and end under partly cloudy skies. With a maximum temperature reaching 19°C and a minimum of 11°C, the weather will be relatively mild. Humidity levels are at 69%, and there's a modest 19% chance of precipitation, with winds gusting up to 22mph. This will be ideal weather for those wanting to enjoy the outdoors with minimal interruptions.
Saturday
Slightly warmer temperatures are expected on Saturday with a high of 21°C and a low of 16°C. Expect predominantly cloudy skies with periodic rain in the late afternoon. The chance of precipitation rises significantly to 68%, accompanied by higher humidity at 76%, and strong winds reaching up to 25mph. Plan to stay indoors, especially during the late afternoon when the rain is expected to fall.
Sunday
The weather will display a blend of clouds and sunshine with a persistent partly cloudy outlook. Temperatures will stabilize at a comfortable maximum of 19°C and a minimum of 14°C. Sunday carries a 68% chance of rain, so a light waterproof jacket might come in handy. Moderate winds of 17mph will prevail as the humidity drops slightly to 65%.
Commuting Advice
Londoners should prepare for gale-force winds on Saturday. You may need extra time to commute, especially during periods with heavier rain showers. On Friday and Sunday, commuting should be relatively straightforward, but consider taking an umbrella as sporadic rain could occur.
Advice for Weekend Plans
For those planning outdoor activities, Friday presents the best opportunity for a rain-free outing. Consider shifting more weather-dependent plans to this day. Indoor activities like visiting museums or galleries are recommended on Saturday due to the higher risk of rain. Sunday is likely best kept flexible, with potential for drizzle at times, so plan accordingly for any weather-sensitive events.
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