Britain has a fairly temperate climate and the weather can vary greatly from day to day, you can expect clouds and rain even in high summer. Temperatures in July and August average around 18°C (64°F) but can occasionally soar to 30°C (85°F) or more. In spring and autumn temperatures average 11-15°C (50-58°F) and in winter they hover just below 6°C (42°F).
British summer time starts on the last Sunday in March when clocks go forward 1 hour and ends on the last Sunday in October when they go back 1 hour. The time for the rest of the year is Greenwich Mean Time (GMT).
View the local time and weather in London