26's and 27's in the south on sunny days. We've been spoilt with 28-32 for a long while. Some of these autumnal look posts are on the pessimistic side. As you say a slack flow, with long hours of sunshine leads to good diurnal and surface heating with comfortable nights after midnight. No sign of temps being in the mod teens on any charts which I would consider to be more autumnal. Anyone know what and where today's maxima was recorded ?