An unstable air mass is affecting the area.
Monday will start off partly cloudy with the possibility of scattered showers in the morning, mainly in the south and east.
More clouds will form later which are expected to lead to scattered showers and isolated thunderstorms mainly in the mountains, in the west, north and locally in the south, but also in areas inland.
Thunderstorms may be accompanied by hail.
Temperatures will rise to 34 C inland, around 31 C on the coasts and around 25 C in the mountains.
Tonight will be partly cloudy with the possibility of scattered showers mainly in some coastal areas.
Temperatures will fall to 20 C inland, around 22 C on the coasts and around 14 C in the mountains.
Tuesday will be initially fine but clouds that develop later in the day are expected to lead to scattered showers or thunderstorms mainly in the mountains, inland and in the south east.
Wednesday and Thursday will be mainly fine,with increased cloud in the mountains and inland from midday on.
Temperatures will edge up over the three days, mainly inland and in the mountains, to close to average for the time of year.