The Met Office is predicting a stormy start to the weekend with a risk of localised flooding in Leicestershire on Saturday.
It has issued a code yellow warning for the county, as well as a large portion of the United Kingdom, which means residents need to stay vigilant to the risk of severe weather conditions developing.
Met Office spokesman Dan Williams said: "We could see some heavy downpours with quite a lot of rain pouring in a short period. This could lead to localised flooding."
He added that it would be difficult to determine where the worst affected areas would be until "closer to the event".
Warm, humid air will be pulled northwards from France, Spain and Morocco late tomorrow and during Saturday.
This could lead to thunderstorms because as the warm, moist air rises, it collects moisture in the atmosphere through condensation.
As that warm, moist air meets the cooler air in the United Kingdom it creates an unstable atmosphere will be formed, causing conditions likely to bring about thunderstorms.
However, Dan said that some areas covered by the code yellow warning could miss out on the worst of Saturday's storms.
He said: "Right now we cannot determine which areas will be worst hit. There will still be a risk of heavy rain running right throughout the day though."
Temperatures are not expected to dip too low tomorrow (Sat) with a predicted minimum of 13 deg C and a maximum of 20 deg C.
Leicester City Council's annual Riverside Festival takes place this weekend, and is not being affected by the inclement weather predictions. A spokesman for the authority said the event, on the River Soar's Mile Straight and neighbouring Bede Park, on the edge of the city's West End, would continue as planned.
The festival, which runs on Saturday and Sunday, is one of Leicester's biggest free events and usually attracts thousands of visitors to the area.
Activities planned for this year's festival include boat trips on the River Soar, and live music stage and plenty of activities for children such as street performers and storytelling.
The city council spokesman said: "We also have indoor activities planned. The river would have to completely flood over the banks for it to make a mess of our event."
