Best Period to Go: Any tourist can visit Cork any time of the year. The average temperature of the city year round is mild with 10 degree Celsius and winter season rarely experiences snowfall. The month of January and February are with grey skies and the temperature at this time is 4 to 8 degree Celsius. The month of July and August is average with 15 degree Celsius. The summer days are quite long and the most beautiful month is February to June when it rains.