Summer heat is streaming into the east today, with some areas seeing the mercury rise above 40 degrees. As a trough swings through the south it is drawing hot air from the country's interior ahead of it. The hottest air is pushing into western Queensland and interior parts of New South Wales. Many areas across NSW climbed five to ten degrees above average, making it the hottest day since the official start of summer but does not compare with the heat we saw in November. Coastal areas were a bit cooler with sea breezes so Sydney reached 29 degrees while its western suburbs soared to the mid to high thirties. Penrith and Richmond both reached 39 degrees but was only their warmest in around a week. Further inland, closer to the source of the hot air, temperatures nudged 40 degrees. Gunnedah, Moree and Walgett all saw their warmest days in around two weeks, rising into the lower forties. Conditions were similar in Queensland with sea breezes on the coast holding temperatures to the upper twenties and low thirties, while just inland areas climbed into the mid to upper thirties. Temperatures will remain hot tomorrow before a weak change moves into NSW, having little affect on QLD.