Monday itself starts dry, with early mist and fog clearing to a mix of cloud and sunny spells and highs of 17C to 23C, warmest in the south. After a mild night with lows of 9C to 14C, the mercury is set to climb to 27C on Tuesday and 28C on Wednesday, though the west and northwest will be cloudier with some outbreaks of rain. Thursday is expected to be the hottest day of the week, with sunny spells, scattered showers and highs of 29C. Forecasters said the coming days would be warm or hot and humid, with the risk of showers at times and mild, muggy nights not falling below 15C to 18C.