Met Office predicts Welsh temperatures to soar to 33C in areas, before cooling down next week. Parts of UK to experience very warm to hot conditions for two days. Sunday and Monday expected to be hottest days in Wales, with southeast reaching up to 25C. Cardiff to hit highs of 24C, Monmouthshire 25C, and southwest England to see highs of 33C. Met Office chart shows Chepstow as one of the warmest areas at 25C. Cardiff and Newport to hit 24C on Sunday, dropping to 21C on Monday. Swansea to have lows of 20C on Monday. Deputy Chief Meteorologist, Dan Holley, expects brief hotter spell due to Tropical Storm Debby in North America. Temperatures around 22°C forecasted for most of Wales on Saturday, with sunnier and warmer conditions expected on Sunday and Monday. Humid with chance of thunderstorms later.