The weather bureau forecasts Queensland's south-east will today experience its coldest day this year after wild storms lashed the region last night, leaving 25,000 homes without power.A cold front hit the region last night bringing severe storms, with lightning, plummeting temperatures and strong winds. --------------- June rain 'on way' but keep taps off --------------- At Oakey, west of Brisbane, the mercury fell to five degrees while Brisbane recorded 11 degrees overnight.Bureau of Meteorology senior forecaster Bryan Rolstone said it would be cold for the next few days."We are in for much colder mornings to come - maybe even 7 degrees for Brisbane on Tuesday," Mr Rolstone told AAP."We may even get some frosts out towards Ipswich on Tuesday and Wednesday."Thunderstorms last night left almost 25,000 homes and businesses without power.Thousands of lightning strikes were recorded as the line of storms passed through South East Queensland between 4 and 6pm (AEST), while wind gusts in excess of 100km/h were recorded.An Energex spokesman said staff have worked through the night to restore power to homes and businesses.The spokesman said the power outages were caused mostly by lightning strikes hitting Energex infrastructure and strong winds blowing tree branches onto power lines.The worst affected areas were the Brisbane and Lockyer Valleys, the southern Moreton Bay suburbs, northern Brisbane and the Sunshine Coast hinterland.With forecast strong winds continuing today, Energex is warning members of the public to be wary of powerlines being brought down or damaged. AAP