ATHENS – Unstable weather is forecast on Sunday, with isolated rain and thunderstorms, especially Macedonia and Thrace. Variable winds registering 3 to 5 on the Beaufort scale, rising to 6 in the Ionian and the South Aegean. Temperatures will return to normal levels for the season, at 20C-35C. In Athens, generally fair with isolated clouds from midday on and possible showers in the north. Variable winds registering 3 to 4 on the Beaufort scale, and temperatures from 24C to 35C. In Thessaloniki, unstable weather, with scattered showers and thunderstorms. Northerly winds registering 3 to 4 on the Beaufort scale, and temperatures ranging from 22C to 31C.