<sod >On Saturday, temperatures in the south will be in the mid 20s, with London expecting to be around 25C (77F), while across the rest of the country it'll be slightly cooler, in the low 20s.< eod>< sod > On Saturday, temperatures in the south will be in the mid 20s, with London expecting to be around 77F (25C), while across the rest of the country it'll be slightly cooler, in the low 70s F (low 20s C).< eod>