The Met Office has forecast a hot day across South Yorkshire.
Forecasters said it will be very warm, locally hot with sunny spells, with a maximum temperature of 28 C.
Tonight a warm evening is forecast with late sunshine. Cloud will increase overnight with occasional rain possible later.
It will feel humid, with light winds and a minimum temperature of 15 C.
Monday will see very warm weather again, with sunshine and a maximum temperature of 28 C. Intermittent rain is possible, with isolated thundery showers possible later in the day.