The Met Office has issued a yellow warning of heavy, thundery showers across parts of Leicestershire tomorrow. Intense localised downpours are forecast from the early hours onwards and could give up to 15 to 20 mm of rain within an hour and 40 mm within three hours very locally. People are urged to be aware of the risk of localised surface water flooding in the areas affected. The warning comes after the UK was set to enjoy some of its warmest temperatures today. Temperatures were set to reach a high of 26C today with maximum temperatures of 21C tomorrow. The hottest and possibly most humid day of the year so far, came a week before the anniversary of one of the freak storm in which lightning strikes hit buildings in Leicester city centre, flash floods made roads impassable and hailstones the size of golf balls rained down damaging homes and vehicles. The outlook for Friday to Sunday is more heavy, localised showers and much cooler temperatures. With more rainfall forecast for the county, the chances of a hosepipe ban seem increasingly unlikely. As reported earlier, Severn Trent Water said the wet spring means customers are unlikely to face a hosepipe ban. this summer.• See the five-day forecast for Leicester and Leicestershire. • Read also: Leicestershire battered by storms and torrential rain Tornado, hail, thunder... yes, summer's here!